Top Circuits Page 267
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A common-base Colpitts oscillator using a pnp transistor as the amplifying device. Notice in this version of the Colpitts oscillator that regenerative feedback is obtained from the tank circuit and applied to the emitter. Base bias is provided by resistor RB....
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Crystal oscillators are those in which a specially-cut crystal controls the frequency. CRYSTAL-CONTROLLED OSCILLATORS are the standard means used for maintaining the frequency of radio transmitting stations within their assigned frequency limits. A....
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First section of free-running 7413 Schmitt-trigger oscillator runs at one-third of desired TV-channel carrier frequency (about 20 MHz for channel3) and drives buffer section whose output is square wave at oscillator fundamental. Q1 modulates RF output by....
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Is equivalent to single-pole electromechanical latching relay with electrically isolated solenoid. Once turned on, circuit remains in conducting state even though line voltage is interrupted for long periods of time. Positive reset action requires that....
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An NE592 or LM733 is used as a general-purpose video amplifier in this schematic. J2 and J3 provide two anti-phase outputs. R2 is a gain control. The bandwidth is about 100 MHz. ..
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This THD circuit is somewhat different from the usual types: it can operate at the standard fre-quency of 1000 Hz, but it also is tunable from 970 Hz to 1030 Hz, and has an adjustable Q factor of 0. 3 to over 50. Op-amp UI, a TLC272 CMOS unit, contains the....
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Power for the circuit is provided by B1, a 9-V battery. Total battery current is 14. 5 mA, so an alkaline battery should last about 250 hours. Audio signals are picked up by microphone MIC1. The output of MIC1 is buffered by Q1 to maintain the 3000- © load....
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This high-voltage pulse supply will generate pulses up to 30 kV. Q1 and Q2 form a multivibrator in conjunction with peripheral components R1 through R6 and C1, C2, C3, C5, C6, and D2. R9 adjusts the pulse repetition rate. R2 should be selected to limit the....
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This circuit uses a 555 timer to drive a 4017 counter. The counter outputs drive transistor relay drivers. Time lights "on" can be proportioned by changing connections of outputs of counter. ..
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The helium-neon laser requires two voltages: a voltage in the range of 10 kV that starts the laser and then turns off once the discharge begins, and a lower-voltage power supply to sustain the dis-charge. The circuit diagram illustrates one method of....
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A few of the many ways to input a signal into the NE602. Simple untuned methods (a and b) are acceptable. If you need to tune to a specific frequency, you can use an LC resonant circuit with un-grounded trimmer capacitors (c and d) or with grounded variable....
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Beckman model W industrial-type pH meter is d-c amplifier designed for measuring potentials generated by pH-sensitive electrodes. Output will drive most recorders. R32 is used only with 4 to 14 pH meter, and R33 only with -1 to 9 pH meter. -G. C. Car. roll,....
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The figure shows a basic two-channel op-amp mixer circuit. The gain is equal to R5/R1 or R5/R2 for channel 1 or 2, respectively. Typically R1 and R2 are 2. 2 to 22 k © and R5 is 10 to 100 k ©, and the op amp is any suitable type, such as a 741 or its....
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S1 is a power switch. U2 drives counter U3 by producing a pulse when S2 is depressed. U4 and DISP1 read the count of counter IC U3. S3 is a reset to zero switch. The counter is a basic one-digit circuit useful as a holding block or by itself. ..
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Incorporates heavy degenerative feedback in which small lamp is nonlinear compensating resistance. Provides constant output frequency and voltage for any supply between 12 and 32 V, at temperatures down to -20 °F. Frequency is determined by capacitors C and....
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This circuit shows an ICL7106 connected with a silicon transistor to form a digital thermometer. Direct connections between the ICL7106 and an LCD display are shown in Fig. 12-11B. A diode-connected silicon transistor has a temperature coefficient of about....
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This circuit shows a simple 4-digit frequency counter using an ICM7217 and an ICM7207 (which provides the 1-s gating window and the STORE and RESET signals). The display reads hertz directly, as connected. With pin 11 of the ICM7027 connected to VDD, the....
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Provides at leaet 200 kc deviation when applied to base of oscillator transistor, before severe distortion sets in. feedback keeps output impedance low. -D. Enemark, Transistors Improve Telemeter Transmitter, Electronics, 32:11, p 136-137. ..
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This LM3909 circuit produces a rapidly rising wail upon pressing the button, and a slower "coasting down" sound upon release. If it is desirable to have the tone stop sometime after the button is released, an 18-k © resistor can be placed between pins 8 and....
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Repeater or other unattended equipment can be turned on or off with ordinary telephone Phone at remote station is called and allowed to ring three times Caller then hangs up, waits 20 s, redials number and lets it ring three times again, then hangs up.....
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4-channel SQ logic decoder. Current drain is 75 mA at 20 volts. Input impedance is 2M, while output impedance is 2K (courtesy GTE Sylvania Incorporated)...
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The full circuit diagram for the audio sine-wave generator is shown. Resistors R1 and R2 bias the noninverting (pin 3) input of IC1, and their parallel resistance forms one element of the Wien net-work. They are the equivalent of R1 in Fig. 1. The other....
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50-watt PMS hi-fi amplifier for an 8-ohm load. This circuit delivers about 56 volts peak to peak across an 8-ohm load. Distortion is about 1 % at 20 kHz. The ganged switch at the input is for selecting either disc or FM radio. The input 741 stage is a....
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A 741 op amp is connected to a Wien-bridge, audio-sine-wave oscillator configuration, with C1, C2, R1, and R2 determining the circuit`s operating frequency. With the use of NPO capacitors and metal-film resistors, the oscillator`s frequency is stable enough....
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SECAM system uses time multiplexing of two chrominance signals, transmitted sequentially, with one-line memory in receiver circuit. -R. Chaste, P. Cassagne, and M. Colas, Sequential Receivers for French Color Tv System, Electronics, 33:19, p 57-60. ..
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Uses three transislor stages und Foster-Seeley discriminotor to give audio output of 1 v peak to peak. -D. Bray, Solid State Makes Debut in Big Screen Color Tv, Electronics, 39:8, p 99-105. ..
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A sidetone oscillator is a special audio oscillator that is turned on and off with the transmitter. The oscillator is rf-driven and bat-tery operated. It uses a 555 IC timer as an astable multivibrator. Keying is accomplished by applying a positive dc....
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Trigger is applied to first of four 2-kv switch modules arranged in series, for simultaneous triggering of other modules to furnish 16-kv 20-amp pulse to type 7208 Ku-band coaxial magnetron through standard 50-ohm pulseforming network PFN. -F. A. Gateka and....
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The oscillator circuit uses a center-tapped transistor output transformer to serve as a load for the collector of Q1, supply a feedback signal for the base, and serve as the output winding for driving the speaker. R1 supplies dc bias and C1 completes the ac....
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A high-voltage current-limiting transformer (T1) supplies power to the basic LC tuned circuit. As C1 charges to near the transformer`s maximum output voltage, the spark gap`s air space breaks down, completing the circuit between the inductor and capacitor,....
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With sine-wave input, RCA CA3046 transistor array connected as VCO can be used as low-distortion FM signal generator. With sawtooth input, same arrangement serves as wobbulator. Increasing size of timing capacitor reduces op-erating frequency, permitting use....
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Triac temperature-sensitive heater control. This circuit can be modified as shown to control a motor with a constant load. As shown the circuit is for heating applications but can be used for cooling by interchanging RT and R2 (courtesy Motorola....
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Low-cost light dimmer using an SBS and triac. Shunting the SBS with two 20K resistors minimizes the flash-on effect, courtesy Motorola Semiconductor Products Inc. ..
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Solid-state relay circuit with input protection of the MOC3011 triac driver. The input voltage to the protection circuit can be 3 to 30 volts DC (courtesy Motorola Semiconductor Products Inc. ). ..
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Color TV subcarrier generator. The crystal shown is for 3. 58 MHz. The ECG1131 noted on the schematic is a chroma signal amplifier. The ECG1132 is a 16-pin DIP (courtesy GTE Sylvania Incorporated). ..
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Color TV chroma processor with ACC, color killer, and an injection lock reference system. fypical power supply voltage is 9 to 11. 5 volts. Hue control range is 100 degrees. The oscillator output signal is 180 mV PMS (courtesy GTE Sylvania Incorporated). ..
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Instead of using a varactor to frequency-modulate a high-frequency oscillator, this circuit uses base-charging capacitance modulation. Consequently, the large voltage change required by a varactor, which can be a major problem in battery-powered systems with....
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This circuit shows a solid-state fluorescent-lamp starter that uses a SIDAC. In this circuit, the ballast is identical to that used with a conventional glow-tube starter. ..
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Time delay circuit using a UJT. Maximum time delay is set by the 10M pot. Time delay can be set from less than a second to approximately 2. 5 minutes (courtesy Motorola Semiconductor Products Inc. ). ..
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Generates force field of high-intensity sound inside car, painful enough to discourage thief from entering car after tripping alarm switch by opening door. Circuit produces square-wave output that sweeps up and down in frequency. Modulation is provided by....
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Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher IC to simulate fire-alarm siren. Pressing button produces rapidly rising wail, with tone coasting down in frequency after button is released. Sound from loudspeaker resembles that of....
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This circuit uses a CA3059 or CA3079 zero-voltage switch to control turn-on time of a triac. The delay between switch closure and turn-on is set by the values of R and C, as shown by the equation. ..
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Universal motor control with built-in self-timer. Use this circuit only with motors having commutators. If heavy motor loads are anticipated, use a larger-rated C30B SCR in place of the GE-X1 for SCR2. To increase the time delay increase the capacitance of....
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100 MHz frequency and period counter using the Intersil ICM7226B 40-pin DIP. This circuit uses a CD4016 analog multiplexor to multiplex the digital outputs back to the function input. Since the CD4016 is a digitally controlled analog transmission gate no....
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Inexpensive frequency counter/tachometer. This circuit uses a 556 dual timer to generate the gating, not-store and not-reset signals for a ICM7217 counter. One timer is an astable multivibrator using RA, RB and C to provide an output that is positive for....
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Circuit used in Dietz siren-light police-car system gives distinctive tones. Position t of S1 produces slow continuous rise and fall. Position 3 produces fast rising and falling tone. Position 2 rises slowly to full pitch when point 1 is grounded, then....
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Precision frequency counter/tachometer. The ICM7207A provides a 1-second gating window and the store and reset signals. The display reads hertz directly. With pin 11 of the ICM7207A connected to V+ the gating time will be 0. 1 second, which gives tens of....
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Uses 5558 dual opamp and four general-purpose NPN transistors to generate triangle wave that can be distorted by 10k symmetry control to give either fast or slow rise for sawtooth applied as base bias to astable MVBR Q1-Q2. Drain is reasonably low with 9-V....
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Tone is made adjustable by using multiposition switch to change capacitors in oscillator circuit. Speed (rate of change in frequency) of siren is adjusted with R3. 4700-ohm resistor in series with R3 keeps siren op-erational when R3 is rotated to....
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Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher ICs to simulate "whooper" sounds of electronic sirens used on some city police cars and ambulances. Two flashers are required for generating required rapidly rising and falling....
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Achieves high carrier and modulation suppression by using closely matched diodes and providing R1 for amplitude adjustment and coaxial line for phase adjustment. R2 provides slight amplitude adjustment. -W. H. Ellis, Diode Quad Modulator Suppresses Carrier....
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Permits monitoring local VHF FM repeater for calls from friends without having to listen to chatter of others or to repeater noise. Operation is similar to that of Motorola paging units in which special tone is transmitted to disable squelch of receiver....
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Five-stage amplifier Q1-5 amplifies both control signals, 38. 285 kc and 41. 805 kc, while Q6 and Q7 operate as class B detector-amplifiers to eliminate need for separate diode detectors. Desired control frequency energizes only one coil of double-fulcrum....
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Varies speed and direction of 5-amp reversible series ac motor in accordance with d-c control signal. Polarity of control signal determines direction of rotation. Gain potentiometer adjusts slope of speed versus control voltage curve. -M. P. Southworth,....
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This circuit shows the basic UJT building block (Fig. 9-1), which is used in a light dimmer with soft-start operation that applies current to the light slowly enough to eliminate high surges (high inrush current). These current surges, found in most....
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This voltage-tuned Clapp oscillator uses a varactor diode to set its operating frequency. D1 is an NTE614. L1 is about 7/ ’ (MHz) microhenries. With the circuit shown, the frequency range is about 6 to 15 MHz. ..
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Free-running multivibrator keys power amplifier Q4 at audio role. Range is about 1 mile C6 tunes collector of oscillator to crystal frequency. -Texas lnstruments Inc. , "Transistor Circuit Design, " McGraw-Hill, N. Y. , 1963, p 361. ..
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Designed around an LM3900 quad op amp, this mixer combines 2-line and 2-mike inputs and sums them at the output terminal. R7 through R10 can be changed to vary the gain (around +23 dB). ..
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With the values shown, this circuit has a ±0. 025 °C accuracy over 0 ° to 100 °C. The input offset voltage of the LT-1001, and its drift with temperature, are permanently trimmed at wafer test to a low level. However, if further adjustment of VOS is....
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The resistors in the output lines are included to isolate reflections from unterminated lines. If the line characteristics are known, the resistors can be deleted. To meet NTSC gain-phase requirements, a small-value boost resistor is used. Figures 3-27B and....
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The CA3217E contains all required circuit functions between the video detector and picture-tube RGB driver stages of a color television receiver. The CA3217E decodes the chroma signals and then produces three different color signals that are internally....
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This circuit shows a CA3256 switch/amplifier connected for a direct-coupled output. One of four channels can be selected in parallel with channel 5. The analog switches of channels 1 to 4 are digitally controlled by logic (Fig. 3-35B). A VEE of -5 V is....
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The circuit has four inputs. The voltage gain between each input and the output is held at unity by the relative values of the 470k © input resistor and the 470k © feedback resistor. ..
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With this basic circuit, the input current is fed directly into the summing node (pin 2) and the op-amp output changes to extract the same current from the summing node through R1. The scale factor of this circuit is R1 volts per amp. That is, the output....
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Control pulses transmitted in blanking interval by tv network transmitter are decoded by receiver circuits shown and translated into six different switching actions used to introduce special program matter such as commercials, weather reports, and local film....
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This regulator uses the drop across R3 to sense current draw, turning on Q2, removing drive from Q1, and lowering the output voltage. Limiting occurs when Q2 has 0. 65 V across the base-emitter junction. This circuit has foldback characteristics as seen from....
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Cathode-follower hydrophone isolation amplifier and high-gain preamplifier feed Navy RBA-6 low-frequency radio receiver on trawler, to receive modulated 21-kc beam that transmits trawl net depth data. -F. H. Stephens, Jr. , Underwater Telemeter for Trawl....
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Ultrasonic bursts from handheld transmitter are picked up by microphone and fed to ujt threshold detector 2N2646 that also generates trigger pulse. Two cascaded bistable dividers control three transistors shunted across volume control, to give full volume....
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Frequency of transistor oscillator is controlled by either of two lengths of nickel tubing, each looting inside form having two coil windings. One coil acts as driver and the other as pickup to provide feedback voltage for sustaining oscillation at control....
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Switch applies positive pulse to gate of scs, triggering it on and thereby supplying power to relay load and ujt timing circuit. At end of timing interval, determined by R-C, timer feeds negative pulse to anode to turn off scs. -"Transistor Manual, " Seventh....
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Attenuation of ultrasonic pulses boomed through test piece reveals presence and extent of internal defects, such as nonbonds between aluminum cladding and uranium core. Test piece and transducers are submerged in water to provide good coupling for 900-kc....
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Determines exact depth of trawl net under water, for interception of desired school of fish. Continuous depth information is transmitted to trawler by modulated 21-kc ultrasonic beam, along with water temperature. -F. H. Stephens, Jr. , Underwater Telemeter....
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Timer start-pulse generator is fast series-transistor coincidence circuit. Slop-gate generator is one-shot mvbr that prevents 1N97A diode from passing blocking oscillator negative sync pulse until mvbr fires. Used to count number of sing-around cycles and....
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Used in recording signals from active sonar on magnetic tape, for later playback to control land-based sonar used in training operators. Modulator is basically sawtooth generator whose repetition frequency is changed by amplitude of modulating input signal.....
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A MAX620 connected to form a complete stepper-motor drive. TTL/CMOS signals from the logic network are translated to high-side levels that drive four N-channel power MOSFETs, supplying current to each of four stepper-motor phases. The diodes provide a....
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Each grid is biased to cutoff, so mixer accepts only positive-polarity pulses having sufficient amplitude to overcome this bias. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p N4-2. ..
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Uses two separate common-cathode video mixers. Same heading markers are inserted into both mixers front input 2, while other inputs handle independent markers. -NBS...
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Combining of video signals with pulses is accompanied by inversion of input signal. Value of R4 is 270 ohms for 5670 and 470 ohms for 6021. R2 is 680 ohms for 5670 and 1 K for 6021. Input signals must be positive. -NBS, "Handbook Preferred Circuits Navy....
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Used in radar systems for combining any three of the following: radar video, beacon, range markers, range strobe, and azimuth markers. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p N4-1. ..
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Used for combining four different positive-polarity marker pulses in radar system. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p N4-1. ..
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Negative video plus iff signals are inserted at grid, while range strobe, from cathode output of blocking oscillator, is applied to cathode. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p....
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Most of the V/F converters in this chapter produce pulse or square-wave outputs. Many applications (such as audio, filter, or automatic-equipment testing) require a sine-wave output, such as is produced by this circuit. The sine waves from this circuit span....
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Includes direct-coupled preamplifier and driver stages, with considerable d-c feedback to stabilize bias conditions. Voltage gain of amplifier with feedback loop closed is 10, 000. Overall efficiency is 50%. Input impedance is 10, 000 ohms and output....
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Distance markers and iff signals are inserted at separate grids on one tube, while radar video from input 3 is impressed on control grid of other pentode. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. l, Electron Tube....
A common-base Colpitts oscillator using a pnp transistor as the amplifying device. Notice in this version of the Colpitts oscillator that regenerative feedback is obtained from the tank circuit and applied to the emitter. Base bias is provided by resistor RB....
Crystal oscillators are those in which a specially-cut crystal controls the frequency. CRYSTAL-CONTROLLED OSCILLATORS are the standard means used for maintaining the frequency of radio transmitting stations within their assigned frequency limits. A....
First section of free-running 7413 Schmitt-trigger oscillator runs at one-third of desired TV-channel carrier frequency (about 20 MHz for channel3) and drives buffer section whose output is square wave at oscillator fundamental. Q1 modulates RF output by....
Is equivalent to single-pole electromechanical latching relay with electrically isolated solenoid. Once turned on, circuit remains in conducting state even though line voltage is interrupted for long periods of time. Positive reset action requires that....
An NE592 or LM733 is used as a general-purpose video amplifier in this schematic. J2 and J3 provide two anti-phase outputs. R2 is a gain control. The bandwidth is about 100 MHz. ..
This THD circuit is somewhat different from the usual types: it can operate at the standard fre-quency of 1000 Hz, but it also is tunable from 970 Hz to 1030 Hz, and has an adjustable Q factor of 0. 3 to over 50. Op-amp UI, a TLC272 CMOS unit, contains the....
Power for the circuit is provided by B1, a 9-V battery. Total battery current is 14. 5 mA, so an alkaline battery should last about 250 hours. Audio signals are picked up by microphone MIC1. The output of MIC1 is buffered by Q1 to maintain the 3000- © load....
This high-voltage pulse supply will generate pulses up to 30 kV. Q1 and Q2 form a multivibrator in conjunction with peripheral components R1 through R6 and C1, C2, C3, C5, C6, and D2. R9 adjusts the pulse repetition rate. R2 should be selected to limit the....
This circuit uses a 555 timer to drive a 4017 counter. The counter outputs drive transistor relay drivers. Time lights "on" can be proportioned by changing connections of outputs of counter. ..
The helium-neon laser requires two voltages: a voltage in the range of 10 kV that starts the laser and then turns off once the discharge begins, and a lower-voltage power supply to sustain the dis-charge. The circuit diagram illustrates one method of....
A few of the many ways to input a signal into the NE602. Simple untuned methods (a and b) are acceptable. If you need to tune to a specific frequency, you can use an LC resonant circuit with un-grounded trimmer capacitors (c and d) or with grounded variable....
Beckman model W industrial-type pH meter is d-c amplifier designed for measuring potentials generated by pH-sensitive electrodes. Output will drive most recorders. R32 is used only with 4 to 14 pH meter, and R33 only with -1 to 9 pH meter. -G. C. Car. roll,....
The figure shows a basic two-channel op-amp mixer circuit. The gain is equal to R5/R1 or R5/R2 for channel 1 or 2, respectively. Typically R1 and R2 are 2. 2 to 22 k © and R5 is 10 to 100 k ©, and the op amp is any suitable type, such as a 741 or its....
S1 is a power switch. U2 drives counter U3 by producing a pulse when S2 is depressed. U4 and DISP1 read the count of counter IC U3. S3 is a reset to zero switch. The counter is a basic one-digit circuit useful as a holding block or by itself. ..
Incorporates heavy degenerative feedback in which small lamp is nonlinear compensating resistance. Provides constant output frequency and voltage for any supply between 12 and 32 V, at temperatures down to -20 °F. Frequency is determined by capacitors C and....
This circuit shows an ICL7106 connected with a silicon transistor to form a digital thermometer. Direct connections between the ICL7106 and an LCD display are shown in Fig. 12-11B. A diode-connected silicon transistor has a temperature coefficient of about....
This circuit shows a simple 4-digit frequency counter using an ICM7217 and an ICM7207 (which provides the 1-s gating window and the STORE and RESET signals). The display reads hertz directly, as connected. With pin 11 of the ICM7027 connected to VDD, the....
Provides at leaet 200 kc deviation when applied to base of oscillator transistor, before severe distortion sets in. feedback keeps output impedance low. -D. Enemark, Transistors Improve Telemeter Transmitter, Electronics, 32:11, p 136-137. ..
This LM3909 circuit produces a rapidly rising wail upon pressing the button, and a slower "coasting down" sound upon release. If it is desirable to have the tone stop sometime after the button is released, an 18-k © resistor can be placed between pins 8 and....
Repeater or other unattended equipment can be turned on or off with ordinary telephone Phone at remote station is called and allowed to ring three times Caller then hangs up, waits 20 s, redials number and lets it ring three times again, then hangs up.....
4-channel SQ logic decoder. Current drain is 75 mA at 20 volts. Input impedance is 2M, while output impedance is 2K (courtesy GTE Sylvania Incorporated)...
The full circuit diagram for the audio sine-wave generator is shown. Resistors R1 and R2 bias the noninverting (pin 3) input of IC1, and their parallel resistance forms one element of the Wien net-work. They are the equivalent of R1 in Fig. 1. The other....
50-watt PMS hi-fi amplifier for an 8-ohm load. This circuit delivers about 56 volts peak to peak across an 8-ohm load. Distortion is about 1 % at 20 kHz. The ganged switch at the input is for selecting either disc or FM radio. The input 741 stage is a....
A 741 op amp is connected to a Wien-bridge, audio-sine-wave oscillator configuration, with C1, C2, R1, and R2 determining the circuit`s operating frequency. With the use of NPO capacitors and metal-film resistors, the oscillator`s frequency is stable enough....
SECAM system uses time multiplexing of two chrominance signals, transmitted sequentially, with one-line memory in receiver circuit. -R. Chaste, P. Cassagne, and M. Colas, Sequential Receivers for French Color Tv System, Electronics, 33:19, p 57-60. ..
Uses three transislor stages und Foster-Seeley discriminotor to give audio output of 1 v peak to peak. -D. Bray, Solid State Makes Debut in Big Screen Color Tv, Electronics, 39:8, p 99-105. ..
A sidetone oscillator is a special audio oscillator that is turned on and off with the transmitter. The oscillator is rf-driven and bat-tery operated. It uses a 555 IC timer as an astable multivibrator. Keying is accomplished by applying a positive dc....
Trigger is applied to first of four 2-kv switch modules arranged in series, for simultaneous triggering of other modules to furnish 16-kv 20-amp pulse to type 7208 Ku-band coaxial magnetron through standard 50-ohm pulseforming network PFN. -F. A. Gateka and....
The oscillator circuit uses a center-tapped transistor output transformer to serve as a load for the collector of Q1, supply a feedback signal for the base, and serve as the output winding for driving the speaker. R1 supplies dc bias and C1 completes the ac....
A high-voltage current-limiting transformer (T1) supplies power to the basic LC tuned circuit. As C1 charges to near the transformer`s maximum output voltage, the spark gap`s air space breaks down, completing the circuit between the inductor and capacitor,....
With sine-wave input, RCA CA3046 transistor array connected as VCO can be used as low-distortion FM signal generator. With sawtooth input, same arrangement serves as wobbulator. Increasing size of timing capacitor reduces op-erating frequency, permitting use....
Triac temperature-sensitive heater control. This circuit can be modified as shown to control a motor with a constant load. As shown the circuit is for heating applications but can be used for cooling by interchanging RT and R2 (courtesy Motorola....
Low-cost light dimmer using an SBS and triac. Shunting the SBS with two 20K resistors minimizes the flash-on effect, courtesy Motorola Semiconductor Products Inc. ..
Solid-state relay circuit with input protection of the MOC3011 triac driver. The input voltage to the protection circuit can be 3 to 30 volts DC (courtesy Motorola Semiconductor Products Inc. ). ..
Color TV subcarrier generator. The crystal shown is for 3. 58 MHz. The ECG1131 noted on the schematic is a chroma signal amplifier. The ECG1132 is a 16-pin DIP (courtesy GTE Sylvania Incorporated). ..
Color TV chroma processor with ACC, color killer, and an injection lock reference system. fypical power supply voltage is 9 to 11. 5 volts. Hue control range is 100 degrees. The oscillator output signal is 180 mV PMS (courtesy GTE Sylvania Incorporated). ..
Instead of using a varactor to frequency-modulate a high-frequency oscillator, this circuit uses base-charging capacitance modulation. Consequently, the large voltage change required by a varactor, which can be a major problem in battery-powered systems with....
This circuit shows a solid-state fluorescent-lamp starter that uses a SIDAC. In this circuit, the ballast is identical to that used with a conventional glow-tube starter. ..
Time delay circuit using a UJT. Maximum time delay is set by the 10M pot. Time delay can be set from less than a second to approximately 2. 5 minutes (courtesy Motorola Semiconductor Products Inc. ). ..
Generates force field of high-intensity sound inside car, painful enough to discourage thief from entering car after tripping alarm switch by opening door. Circuit produces square-wave output that sweeps up and down in frequency. Modulation is provided by....
Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher IC to simulate fire-alarm siren. Pressing button produces rapidly rising wail, with tone coasting down in frequency after button is released. Sound from loudspeaker resembles that of....
This circuit uses a CA3059 or CA3079 zero-voltage switch to control turn-on time of a triac. The delay between switch closure and turn-on is set by the values of R and C, as shown by the equation. ..
Universal motor control with built-in self-timer. Use this circuit only with motors having commutators. If heavy motor loads are anticipated, use a larger-rated C30B SCR in place of the GE-X1 for SCR2. To increase the time delay increase the capacitance of....
100 MHz frequency and period counter using the Intersil ICM7226B 40-pin DIP. This circuit uses a CD4016 analog multiplexor to multiplex the digital outputs back to the function input. Since the CD4016 is a digitally controlled analog transmission gate no....
Inexpensive frequency counter/tachometer. This circuit uses a 556 dual timer to generate the gating, not-store and not-reset signals for a ICM7217 counter. One timer is an astable multivibrator using RA, RB and C to provide an output that is positive for....
Circuit used in Dietz siren-light police-car system gives distinctive tones. Position t of S1 produces slow continuous rise and fall. Position 3 produces fast rising and falling tone. Position 2 rises slowly to full pitch when point 1 is grounded, then....
Precision frequency counter/tachometer. The ICM7207A provides a 1-second gating window and the store and reset signals. The display reads hertz directly. With pin 11 of the ICM7207A connected to V+ the gating time will be 0. 1 second, which gives tens of....
Uses 5558 dual opamp and four general-purpose NPN transistors to generate triangle wave that can be distorted by 10k symmetry control to give either fast or slow rise for sawtooth applied as base bias to astable MVBR Q1-Q2. Drain is reasonably low with 9-V....
Tone is made adjustable by using multiposition switch to change capacitors in oscillator circuit. Speed (rate of change in frequency) of siren is adjusted with R3. 4700-ohm resistor in series with R3 keeps siren op-erational when R3 is rotated to....
Low-drain circuit operating from 1. 5-V cell uses National LM3909 flasher ICs to simulate "whooper" sounds of electronic sirens used on some city police cars and ambulances. Two flashers are required for generating required rapidly rising and falling....
Achieves high carrier and modulation suppression by using closely matched diodes and providing R1 for amplitude adjustment and coaxial line for phase adjustment. R2 provides slight amplitude adjustment. -W. H. Ellis, Diode Quad Modulator Suppresses Carrier....
Permits monitoring local VHF FM repeater for calls from friends without having to listen to chatter of others or to repeater noise. Operation is similar to that of Motorola paging units in which special tone is transmitted to disable squelch of receiver....
Five-stage amplifier Q1-5 amplifies both control signals, 38. 285 kc and 41. 805 kc, while Q6 and Q7 operate as class B detector-amplifiers to eliminate need for separate diode detectors. Desired control frequency energizes only one coil of double-fulcrum....
Varies speed and direction of 5-amp reversible series ac motor in accordance with d-c control signal. Polarity of control signal determines direction of rotation. Gain potentiometer adjusts slope of speed versus control voltage curve. -M. P. Southworth,....
This circuit shows the basic UJT building block (Fig. 9-1), which is used in a light dimmer with soft-start operation that applies current to the light slowly enough to eliminate high surges (high inrush current). These current surges, found in most....
This voltage-tuned Clapp oscillator uses a varactor diode to set its operating frequency. D1 is an NTE614. L1 is about 7/ ’ (MHz) microhenries. With the circuit shown, the frequency range is about 6 to 15 MHz. ..
Free-running multivibrator keys power amplifier Q4 at audio role. Range is about 1 mile C6 tunes collector of oscillator to crystal frequency. -Texas lnstruments Inc. , "Transistor Circuit Design, " McGraw-Hill, N. Y. , 1963, p 361. ..
Designed around an LM3900 quad op amp, this mixer combines 2-line and 2-mike inputs and sums them at the output terminal. R7 through R10 can be changed to vary the gain (around +23 dB). ..
With the values shown, this circuit has a ±0. 025 °C accuracy over 0 ° to 100 °C. The input offset voltage of the LT-1001, and its drift with temperature, are permanently trimmed at wafer test to a low level. However, if further adjustment of VOS is....
The resistors in the output lines are included to isolate reflections from unterminated lines. If the line characteristics are known, the resistors can be deleted. To meet NTSC gain-phase requirements, a small-value boost resistor is used. Figures 3-27B and....
The CA3217E contains all required circuit functions between the video detector and picture-tube RGB driver stages of a color television receiver. The CA3217E decodes the chroma signals and then produces three different color signals that are internally....
This circuit shows a CA3256 switch/amplifier connected for a direct-coupled output. One of four channels can be selected in parallel with channel 5. The analog switches of channels 1 to 4 are digitally controlled by logic (Fig. 3-35B). A VEE of -5 V is....
The circuit has four inputs. The voltage gain between each input and the output is held at unity by the relative values of the 470k © input resistor and the 470k © feedback resistor. ..
With this basic circuit, the input current is fed directly into the summing node (pin 2) and the op-amp output changes to extract the same current from the summing node through R1. The scale factor of this circuit is R1 volts per amp. That is, the output....
Control pulses transmitted in blanking interval by tv network transmitter are decoded by receiver circuits shown and translated into six different switching actions used to introduce special program matter such as commercials, weather reports, and local film....
This regulator uses the drop across R3 to sense current draw, turning on Q2, removing drive from Q1, and lowering the output voltage. Limiting occurs when Q2 has 0. 65 V across the base-emitter junction. This circuit has foldback characteristics as seen from....
Cathode-follower hydrophone isolation amplifier and high-gain preamplifier feed Navy RBA-6 low-frequency radio receiver on trawler, to receive modulated 21-kc beam that transmits trawl net depth data. -F. H. Stephens, Jr. , Underwater Telemeter for Trawl....
Ultrasonic bursts from handheld transmitter are picked up by microphone and fed to ujt threshold detector 2N2646 that also generates trigger pulse. Two cascaded bistable dividers control three transistors shunted across volume control, to give full volume....
Frequency of transistor oscillator is controlled by either of two lengths of nickel tubing, each looting inside form having two coil windings. One coil acts as driver and the other as pickup to provide feedback voltage for sustaining oscillation at control....
Switch applies positive pulse to gate of scs, triggering it on and thereby supplying power to relay load and ujt timing circuit. At end of timing interval, determined by R-C, timer feeds negative pulse to anode to turn off scs. -"Transistor Manual, " Seventh....
Attenuation of ultrasonic pulses boomed through test piece reveals presence and extent of internal defects, such as nonbonds between aluminum cladding and uranium core. Test piece and transducers are submerged in water to provide good coupling for 900-kc....
Determines exact depth of trawl net under water, for interception of desired school of fish. Continuous depth information is transmitted to trawler by modulated 21-kc ultrasonic beam, along with water temperature. -F. H. Stephens, Jr. , Underwater Telemeter....
Timer start-pulse generator is fast series-transistor coincidence circuit. Slop-gate generator is one-shot mvbr that prevents 1N97A diode from passing blocking oscillator negative sync pulse until mvbr fires. Used to count number of sing-around cycles and....
Used in recording signals from active sonar on magnetic tape, for later playback to control land-based sonar used in training operators. Modulator is basically sawtooth generator whose repetition frequency is changed by amplitude of modulating input signal.....
A MAX620 connected to form a complete stepper-motor drive. TTL/CMOS signals from the logic network are translated to high-side levels that drive four N-channel power MOSFETs, supplying current to each of four stepper-motor phases. The diodes provide a....
Each grid is biased to cutoff, so mixer accepts only positive-polarity pulses having sufficient amplitude to overcome this bias. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p N4-2. ..
Uses two separate common-cathode video mixers. Same heading markers are inserted into both mixers front input 2, while other inputs handle independent markers. -NBS...
Combining of video signals with pulses is accompanied by inversion of input signal. Value of R4 is 270 ohms for 5670 and 470 ohms for 6021. R2 is 680 ohms for 5670 and 1 K for 6021. Input signals must be positive. -NBS, "Handbook Preferred Circuits Navy....
Used in radar systems for combining any three of the following: radar video, beacon, range markers, range strobe, and azimuth markers. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p N4-1. ..
Used for combining four different positive-polarity marker pulses in radar system. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p N4-1. ..
Negative video plus iff signals are inserted at grid, while range strobe, from cathode output of blocking oscillator, is applied to cathode. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. 1, Electron Tube Circuits, 1963, p....
Most of the V/F converters in this chapter produce pulse or square-wave outputs. Many applications (such as audio, filter, or automatic-equipment testing) require a sine-wave output, such as is produced by this circuit. The sine waves from this circuit span....
Includes direct-coupled preamplifier and driver stages, with considerable d-c feedback to stabilize bias conditions. Voltage gain of amplifier with feedback loop closed is 10, 000. Overall efficiency is 50%. Input impedance is 10, 000 ohms and output....
Distance markers and iff signals are inserted at separate grids on one tube, while radar video from input 3 is impressed on control grid of other pentode. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. l, Electron Tube....
