Top Circuits Page 255
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the circuit has two-stage circuit structures, the timing time is about 0. 5~12s, and in figure (b), the range of the timing time is 1~160s. The parameters of transformer: iron chip: M42/15. 7 silicon steel sheet; winding: 0. 18mm, enameled copper wire....
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Figure 2-33 (a) is the action schematic diagram of the robot closing to the object. When there is no objects in front of the robot, it will go forward in the straight line; when there is an object in left or right side of the robot,it will turn left or right....
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The SCC2 is a solar charge controller, its function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery. It features easy setup with one potentiometer for the float voltage adjustment, an equalize function for periodic....
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Turns on mobile transceiver or other mobile equipmentwhen powerisapplied, if external circuit is broken when equipment is stolen. Transmitter will then put unmodulated carrier on air even with PTT switch disconnected or off, for tracing with radio direction....
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In this circuit, four IRF510 power FETs are driven by a CMOS counter to generate the necessary two-phase drive quadrature. Although ICs are available to do this, this approach is handy for the experimenter because it uses commonly available parts. The....
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The servo motor speed control circuit connects the photoelectric encoder with the motor shaft, the LED is the indicator light of the PLL detection, it turns on when the control circuit is synchronous. The PLL is the phase synchronous control method of the....
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VDP is the photodiode and it has low resistance in the day, and resistance ? 1k?, then transistor VT2 is turned off, then thyristor VT1 is in the off-state as the gate has no trigger current, and E can not be lit. In the night, VL shows a high resistance as....
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The servo motor is designed as one kind of traditional motor. It is the execution component of the automatic device. The most important feature of the servo motor is the controllable feature. When there is the control signal the servo motor turns, and the....
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Sixteenth street control circuit composed of the second decoding output control circuit. Connect an bistable circuit that composed of dual D flip-flop CD4013 to every output terminal of the sixteen decoding. Connect a DC relay on each output terminals of....
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There are 2 kinds of solar automatic tracking controllers. One is Schmitt trigger light control composed of a light sensor and a Schmitt trigger or monostable trigger. The second one is usingtwo light sensors and two comparators to form two light-control....
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Work of the circuit The circuit consists of low-frequency oscillator, the electronic switch circuit, control circuit, photoelectric display circuit and music alarm circuit. (It is showed in picture 7-113.) Low-frequency oscillator consists of IC lCl (Dl-D4)....
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Hall-effect switches have several advantages over mechanical and optically coupled switches. They`re insensitive to environmental light and dirt, they don`t bind, and they don`t sustain mechanical wear. Their major drawback is that they require three wires....
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The picture shows the proximity switch circuit composed of the HMC1001 and operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator here. If taking a magnet with length about 6mm~12mm to close to the....
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SB0061 is a pyroelectric sensor module,developed for human body detection. A PIR detector combined with a fresnel lens are mounted on a compact size PCB together with an analog IC (SB0061) and limited components to form the module. High level output (3.3V)....
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This circuit uses a dual operational amplifier (TL082) to form a voltage-controlled oscillator (VCO). With the component values shown, the output-frequency range is 100 Hz to 10 kHz when the input control voltage is between 0. 05 and 10 V. (View) The input....
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TX05C-R infrared surveillance alarm circuit is shown. It can be used for surveillance of walls, windows, doors and various restricted areas. If someone breaks into or over the alarm position, it will sound to play a security role. The circuit consists of....
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The eggs hatch incubator circuit is composed of the power supply circuit, constant temperature control circuit and sound and light alarm circuit, and it is shown in Figure 4-7. Power supply circuit consists of the power switch Sl, fuse FU2, power transformer....
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The delay circuit is shown in Figure 1, and uses the Mitsubishi M65830 Digital Delay chip. This has been around for a while now, and is simple and effective (provided that a fixed delay is acceptable). The serial data required to obtain different delay....
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This is the FSK modulation circuit composed of 74LS74. The FSK modulation circuit has neither PLL nor bandpass filter with high Q value, so there is no need of any tune adjustment in the high-frequency modulation circuit. The 2 tune circuits composed of L1,....
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In the figure is the NE555 FM modulation circuit. In the figure, NE555 7-pin is connected with a FM modulation circuit which is composed with R5 and C2, but the frequency range is kind of small. VT1 and VT2 form a current Miller circuit, which generates a....
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The camera flashlight circuit when K1 is put through, the self-motivation oscillator composing of BG1, C1, B1 and R1 is starting to work, after being boosted by B1 and rectified by D1, it is charging C2. DW2 makes BG4 conduct when it is 5.6v, the....
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Two-phase servo motor has the field winding and control winding, when the phase difference is 90°, it generates the rotation torque. The potentiometer connected to the motor shaft will get the voltage difference between the corresponding voltage and target....
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Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow oscillator, which are combined through IC1c to emit a high pip-pip-pip warning sound when a gate....
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See as the circuit, it consists of the infrared sensor control circuit, relay control circuit, music generating circuit and so on, which can be used in infrared alarm, timing control and other spots....
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The motorcycle anti-theft alarm which uses the 555 time-base integrated circuit is introduced in this article, and it can send out the alarm when the thief is moving the motorcycle vertically. The principle of the circuit The motorcycle anti-theft alarm....
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The motorcycle anti-theft alarm is introduced in this article, it uses the private displacement sensor and has the features of high sensitivity, good reliability, low false alarm rate and easy to make. The principle of the circuit This motorcycle anti-theft....
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No matter what kind it is, passive human body infrared sensor circuits are almost the same with the above, maybe some has less stages. This circuit in the figure is got from the NICERA producer, which is classical. The stage of front-end is the low frequency....
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As shown in Figure, the circuit usestwo time relays KT1, KT2 to connect with thecontactsofelectric contact pressure gauge SP in series. When liquid or gas pressure has not yet reached, it can overcome thetrembling or spark phenomenons because of the SP`s....
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The circuit composition determines that the LED adopts anodic Nixie tube. It can use LQ5101BS general luminous diode and the driving triode can use 2SA1015 or 2SC1815 types which is easy to gain. Of cause, the triode can also use low-power triode such as....
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The foot 13 between valve value 1 and valve value 2 will suck the transistor base current. If relay releases, after recovery time 0.5s, to press key then it will start to switch process again. The timer is composed ofwindow discriminator TCA965 to. After....
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Touching dimmer circuit is shown in the following diagram. It uses finger touch control pieceto realize turning on, off or stepless adjustment for incandescent light. It is used in the dimmer of filament lamp, small AC motor`s stepless speed regulation....
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Use the 48V (60V) DC feedback electric current which is provided by the phone feedback line as the working energy of the electronic doorbell is very economical and practical. Now I introduce one kind of two-tone doorbell circuit with out battery. The circuit....
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In the figure, the TL494 is used as the core to form the PWM driver and protection circuit, and the changing frequency is 50kHz. 115V output voltage is sent to P8 after stepping-down and isolating, then it is sent to TL494 error amplifier A1 after getting....
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The interface circuit is added between computer standard video signal output terminal and TV. It can enlarge standard 1V(Peak - peak) video signal am to 3V(Peak - peak). Negative feedback circuit is composed of T1 and T2. It has a wide frequency range. The....
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The recommended Prescaler is ridiculously simple. It consists of just one IC, a TV tuner prescaler, the Philips SAB6456A, which can divide by 64 or by 256. This chip is widely available both new and in the surplus market at much lower prices than....
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Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set`s aerial input via a cable. Then all that remains to do is tune the....
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The circuit shown in this paper uses 12 components to form a miniature wireless FM microphone with stable operating frequency, and its transmitting distance is about 30 meters and more than 100 meters at 6V power supply.The circuit is shown as Figure, BG1,....
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XP-power plug, FU-fuse, ST-temperature control, T1-low-voltage transformers, S1, S2-door interlock switch, S3-threshold control switch, RT-thermal sensor, K1, K2-relay, EL- furnace light, M1-wheel motor, M2-fan motor, T2-high-voltage transformer, C-high....
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The chicken male and female discriminator circuit is composed of the audio detection circuit, active band-pass filter and LED display circuit, and it is shown in Figure 4-11. Audio detection circuit consists of piezoelectric ceramic BC and resistor Rl, R2.....
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The cumulative timer circuit consists of resistor R1 and spreadsheet internal crystal oscillator BC, and it is shown as the chart. R1 and R2 choose the metal film resistors: R3 ~ R5 select the 1/8W metal film resistors. C select the aluminum electrolytic....
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The digital lock circuit is composed of the timing trigger circuit, trick lock circuit, sound and alarm circuit and control implementation circuit, and it is shown in Figure 3-101. Timing trigger circuit is composed of the transistors Vl, V2, resistors....
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The ding-dong electronic doorbell circuit is composed of the power supply circuit, trigger control circuit, audio oscillator output circuit, and it is shown in Figure 3-125. Power supply circuit is composed of the power transformer T, rectifier diodes....
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The ectronic fishing shrimp machine circuit is composed of the astable oscillator, inverter circuit, high voltage output circuit, and the circuit is shown as the figure 20. Astable oscillator circuit is composed of the time-base integrated circuit IC,....
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The electronic locust killer device is composed of the square wave oscillator circuit and high-voltage generator circuit, and the cirucuit is shown in Figure 3-192. Square-wave oscillator is composed of the counting divider lC and resistors R5, R6, capacitor....
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The electronic pests killing lamp circuit consists of the oscillator, control circuit, high voltage generator, LED indicating circuit and power supply circuit, and the circuit is shown as the chart. The oscillator circuit is composed of the time-base....
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The fluorescent lamp electronic ballast circuit is composed of the rectifier filter circuit, high-frequency oscillator circuit and output circuit, and it is shown in Figure 3-202. Rectifier filter circuitis composed of the rectifier diodes VDl-VD4 and filter....
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High speed optocouplers technical parameters are: Rise time t1 ‰¤ 300ns; Circuit eye transfer ratio CTR = 50%; Isolation voltage VSO ‰¥ 15000V; Output transistor reverse breakdown voltage V (BR) CEO ‰¥ 50V. The optical coupler can be widely used for the....
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This circuit is an improved version of the circuit shown in Fig. 8-21. The hysteresis effect is eliminated by the addition of two diodes and the 5.1 -k? resistor. The RC network across the triac is a snubber to prevent line transients from accidentally....
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The inductive electronic doorbell circuit is composed of the inductive electronic switch and music generator circuit, and it is shown in Figure 3-115. Inductive electronic switch circuit is composed of the inductive electrode A, transistor Vl-V4 and the....
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The circuit work theory This infrared automatic hand washing device circuit is composed of power supply, infrared transmitting circuit, infrared receiving circuit and control circuit, the circuit is shown in the figure 9-121. The power supply circuit is made....
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Keyer dimmer table lamp adopts two touch buttons to adjust the light. The light changes weaken from strong when peopletouch one of the buttons, and it changes strong from weaken when peopletouch the other button. Working principle The principle of this....
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The liquid level controller circuit consists of the power supply circuit and level detection control circuit, and it is shown as the chart. Power supply circuit consists of the power switch S1, power transformer T, bridge rectifiers UR1, UR2 and filter....
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This circuit uses the HgCdTe demodulation device which can be cooled to 77K in liquid nitrogen. It uses a constant current bias for the demodulation device which is connected to the input port. The voltage`s amplification factor is 200 and the bandwidth is....
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The picture shows the ultrasonic liquid level indicator circuit. This circuit is made up of ultrasonic transmitter circuit and receiver circuit.The ultrasonic transmitter circuit is made up of 555, R1, W1, C1 and ultrasonic transmitter head UCM40T. The....
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The application circuit shown in the picture below with output voltage higher thanreferenced voltage is composed of the W723 multi-port adjustable positive stabilizer. There is current limiting protectionin this circuit and the output voltage is adjustable....
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As shown in the picture, when the output current exceeds 40mA the internal resistance 50? in the XTR110 (R9) should be replaced by external resistance REXT. REXT is connected between the 13 foot and 16 foot. REXY=R9(original span/required span). For example,....
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This is a fm radio receiver circuit which can be used with PC.PC radio REGULATIONSA) With the P1 we regulate the intensity of sound.B) With the P2 we regulate the frequency of reception.C) Optionally: If you want to check the frequency with your PC it will....
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The password electronic doorbell circuit is composed of the electronic password circuit and music occurred circuit, and it is shown in Figure 3-118. Electronic password circuit consists of integrated circuits lCl and keys Sl-S6, diodes VDl-VD5. lCl is the....
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The password electronic doorbell circuit is composed of the trigger circuit and music generating circuit, and it is shown in Figure 3-119. Trigger circuit is composed of the buttons S1-S9, four NAND gate Schmitt trigger integrated circuit IC1 and the....
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The electronic doorbell circuit is composed of the pickup amplifier, monostable trigger circuit, pulse counter circuit, music generating circuit and audio amplifier circuit and other components, and it is shown in Figure 3-113. Pickup amplifier circuit....
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The politely welcoming electronic doorbell circuit is composed of the trigger control circuit, audio amplifier output circuit, music circuit, voice delay control circuit, and it is shown in Figure 3-122. Trigger control circuit is composed of the doorbell....
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This circuit shows the high and mid part of car radio, and the medium wave band I is 520 ~ 950kHz, Poland II is 900 ~ 1640kHz. Loop tuning uses tunable diode BB113.Main coil data:L1: 122 turns; L2: 122 turns ; L3: 68 turns ; L5: 96 turns ( coupling coil with....
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The receiver ( Figure a) input circuit is supplied by the 60? generator. Low -pass filter allows the entire frequency range with uniform sensitivity. Figure b shows the receiver input circuit coupled with transmitter inductive (Ri = 60?). Figure c shows the....
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Separates 130-cps motor drive voltage from voice frequencies in output of adf receiver-P. V. Sparks, Servo Filter and Gain Control Improve Automatic Direction Finder, Electronics, 34:23, p 110-113....
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Human approach detector circuit is composed of integrated operational amplifier, gate circuit and resistor-capacitor unit in the diagram. Among them, 1MHz oscillator consists of reverser T1, 1MHz crystal oscillator and resistor-capacitor unit. The oscillator....
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The the loop antenna L1 for emission also serves as the oscillation coil, the high-frequency current flowing in antenna is synchronized resonance with the oscillation frequency, so it is always in the best emission state. Accoring to practice, launching....
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This simple water detector circuit uses alternative voltage in order to prevent the corrosion of the electrodes. It is easy to build and uses N1 as a trigger Schmitt gate which generate the AC. If between the electrodes is a electricity conductor, for....
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For the transmitter schematic (part of this transceiver), see entry entitled S-W ATV Transmit-ter for 440 MHz, Fig. 5-1. The downconverter portion is shown here.This transmitter contains both a video and sound section. Five to six watts PEP on synch tips of....
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This low-power NTSC video and sound transmitter is useful for amateur radio, video handle-talkie, R/C and surveillance pur-poses. A crystal oscillator-multip lier RI` power amplifier. Video modulation is via a three-transistor series modulator. The sound....
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TV video processor. The EGG 1134 contains a picture IF amplifier, avideo detector,a video amplifier,keyed AGC with noise immunity, delayed AGC for thetuner, an AFT amplifier, a sound IF amplifier, asound carrier detector, a4.5 MHz sound carrier amplifier and....
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Light-Operated Ring Circuit Average telephone ring circuit is composed of KA2401 and peripheral components. When adding light-operated ring circuit, just connects the part X in picture a with light-operated circuit in picture b. When there is input of AC....
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Ring current generator The ring current generator can produce a ringing current voltage of 75-90V and 25Hz±5HZ. It is available to be used for vibrating ring in communication devices, for example, carrier, ultrahigh frequency, wire telephone. It can also be....
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Simple telephone time lock circuit is shown in the above picture. In the circuit diagram, BG1 and BG2 are electronic switches controlled by IC NE555. When the telephone is on-hook, the DC resistance value of the telephone is over 600K?, the current when the....
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Simplified long-distance call lock is shown in the above picture. The lock can lock out the long-distance call without affecting the original function. It ispower-consuming, but it has very good compatibility. If switch K is placed as the picture shows,....
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Using an AMI chip P/N S2561, this telephone ringer can be powered line. Audio output is about 50 mW when powered from a 10-V source....
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UM95088 telephone circuit diagram is shown in the above picture. UM95088 is specialized integrated module of dual tone multiple frequency for telephone dialing. It adopts the techniques of CMOS with dual-in-line package of 14 pins...
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Tro telephones can be used as an intercom by using this circuit. Older style rotary phones that are nonelectronic might work best in this application. Also, handsets only might be powered this way....
the circuit has two-stage circuit structures, the timing time is about 0. 5~12s, and in figure (b), the range of the timing time is 1~160s. The parameters of transformer: iron chip: M42/15. 7 silicon steel sheet; winding: 0. 18mm, enameled copper wire....
Figure 2-33 (a) is the action schematic diagram of the robot closing to the object. When there is no objects in front of the robot, it will go forward in the straight line; when there is an object in left or right side of the robot,it will turn left or right....
The SCC2 is a solar charge controller, its function is to regulate the power flowing from a photovoltaic panel into a rechargeable battery. It features easy setup with one potentiometer for the float voltage adjustment, an equalize function for periodic....
Turns on mobile transceiver or other mobile equipmentwhen powerisapplied, if external circuit is broken when equipment is stolen. Transmitter will then put unmodulated carrier on air even with PTT switch disconnected or off, for tracing with radio direction....
In this circuit, four IRF510 power FETs are driven by a CMOS counter to generate the necessary two-phase drive quadrature. Although ICs are available to do this, this approach is handy for the experimenter because it uses commonly available parts. The....
The servo motor speed control circuit connects the photoelectric encoder with the motor shaft, the LED is the indicator light of the PLL detection, it turns on when the control circuit is synchronous. The PLL is the phase synchronous control method of the....
VDP is the photodiode and it has low resistance in the day, and resistance ? 1k?, then transistor VT2 is turned off, then thyristor VT1 is in the off-state as the gate has no trigger current, and E can not be lit. In the night, VL shows a high resistance as....
The servo motor is designed as one kind of traditional motor. It is the execution component of the automatic device. The most important feature of the servo motor is the controllable feature. When there is the control signal the servo motor turns, and the....
Sixteenth street control circuit composed of the second decoding output control circuit. Connect an bistable circuit that composed of dual D flip-flop CD4013 to every output terminal of the sixteen decoding. Connect a DC relay on each output terminals of....
There are 2 kinds of solar automatic tracking controllers. One is Schmitt trigger light control composed of a light sensor and a Schmitt trigger or monostable trigger. The second one is usingtwo light sensors and two comparators to form two light-control....
Work of the circuit The circuit consists of low-frequency oscillator, the electronic switch circuit, control circuit, photoelectric display circuit and music alarm circuit. (It is showed in picture 7-113.) Low-frequency oscillator consists of IC lCl (Dl-D4)....
Hall-effect switches have several advantages over mechanical and optically coupled switches. They`re insensitive to environmental light and dirt, they don`t bind, and they don`t sustain mechanical wear. Their major drawback is that they require three wires....
The picture shows the proximity switch circuit composed of the HMC1001 and operational amplifier (AMP04) and light emitting diode (LED). The operational amplifier is used as a comparator here. If taking a magnet with length about 6mm~12mm to close to the....
SB0061 is a pyroelectric sensor module,developed for human body detection. A PIR detector combined with a fresnel lens are mounted on a compact size PCB together with an analog IC (SB0061) and limited components to form the module. High level output (3.3V)....
This circuit uses a dual operational amplifier (TL082) to form a voltage-controlled oscillator (VCO). With the component values shown, the output-frequency range is 100 Hz to 10 kHz when the input control voltage is between 0. 05 and 10 V. (View) The input....
TX05C-R infrared surveillance alarm circuit is shown. It can be used for surveillance of walls, windows, doors and various restricted areas. If someone breaks into or over the alarm position, it will sound to play a security role. The circuit consists of....
The eggs hatch incubator circuit is composed of the power supply circuit, constant temperature control circuit and sound and light alarm circuit, and it is shown in Figure 4-7. Power supply circuit consists of the power switch Sl, fuse FU2, power transformer....
The delay circuit is shown in Figure 1, and uses the Mitsubishi M65830 Digital Delay chip. This has been around for a while now, and is simple and effective (provided that a fixed delay is acceptable). The serial data required to obtain different delay....
This is the FSK modulation circuit composed of 74LS74. The FSK modulation circuit has neither PLL nor bandpass filter with high Q value, so there is no need of any tune adjustment in the high-frequency modulation circuit. The 2 tune circuits composed of L1,....
In the figure is the NE555 FM modulation circuit. In the figure, NE555 7-pin is connected with a FM modulation circuit which is composed with R5 and C2, but the frequency range is kind of small. VT1 and VT2 form a current Miller circuit, which generates a....
The camera flashlight circuit when K1 is put through, the self-motivation oscillator composing of BG1, C1, B1 and R1 is starting to work, after being boosted by B1 and rectified by D1, it is charging C2. DW2 makes BG4 conduct when it is 5.6v, the....
Two-phase servo motor has the field winding and control winding, when the phase difference is 90°, it generates the rotation torque. The potentiometer connected to the motor shaft will get the voltage difference between the corresponding voltage and target....
Figure 1 represents a cheap and simple Gate Alarm, that is intended to run off a small universal AC-DC power supply. IC1a is a fast oscillator, and IC1b a slow oscillator, which are combined through IC1c to emit a high pip-pip-pip warning sound when a gate....
See as the circuit, it consists of the infrared sensor control circuit, relay control circuit, music generating circuit and so on, which can be used in infrared alarm, timing control and other spots....
The motorcycle anti-theft alarm which uses the 555 time-base integrated circuit is introduced in this article, and it can send out the alarm when the thief is moving the motorcycle vertically. The principle of the circuit The motorcycle anti-theft alarm....
The motorcycle anti-theft alarm is introduced in this article, it uses the private displacement sensor and has the features of high sensitivity, good reliability, low false alarm rate and easy to make. The principle of the circuit This motorcycle anti-theft....
No matter what kind it is, passive human body infrared sensor circuits are almost the same with the above, maybe some has less stages. This circuit in the figure is got from the NICERA producer, which is classical. The stage of front-end is the low frequency....
As shown in Figure, the circuit usestwo time relays KT1, KT2 to connect with thecontactsofelectric contact pressure gauge SP in series. When liquid or gas pressure has not yet reached, it can overcome thetrembling or spark phenomenons because of the SP`s....
The circuit composition determines that the LED adopts anodic Nixie tube. It can use LQ5101BS general luminous diode and the driving triode can use 2SA1015 or 2SC1815 types which is easy to gain. Of cause, the triode can also use low-power triode such as....
The foot 13 between valve value 1 and valve value 2 will suck the transistor base current. If relay releases, after recovery time 0.5s, to press key then it will start to switch process again. The timer is composed ofwindow discriminator TCA965 to. After....
Touching dimmer circuit is shown in the following diagram. It uses finger touch control pieceto realize turning on, off or stepless adjustment for incandescent light. It is used in the dimmer of filament lamp, small AC motor`s stepless speed regulation....
Use the 48V (60V) DC feedback electric current which is provided by the phone feedback line as the working energy of the electronic doorbell is very economical and practical. Now I introduce one kind of two-tone doorbell circuit with out battery. The circuit....
In the figure, the TL494 is used as the core to form the PWM driver and protection circuit, and the changing frequency is 50kHz. 115V output voltage is sent to P8 after stepping-down and isolating, then it is sent to TL494 error amplifier A1 after getting....
The interface circuit is added between computer standard video signal output terminal and TV. It can enlarge standard 1V(Peak - peak) video signal am to 3V(Peak - peak). Negative feedback circuit is composed of T1 and T2. It has a wide frequency range. The....
The recommended Prescaler is ridiculously simple. It consists of just one IC, a TV tuner prescaler, the Philips SAB6456A, which can divide by 64 or by 256. This chip is widely available both new and in the surplus market at much lower prices than....
Simple oscillator that generates a frequency in the VHF or UHF region. The oscillator is modulated with the video signal and the modulated carrier wave thus generated is fed into the TV set`s aerial input via a cable. Then all that remains to do is tune the....
The circuit shown in this paper uses 12 components to form a miniature wireless FM microphone with stable operating frequency, and its transmitting distance is about 30 meters and more than 100 meters at 6V power supply.The circuit is shown as Figure, BG1,....
XP-power plug, FU-fuse, ST-temperature control, T1-low-voltage transformers, S1, S2-door interlock switch, S3-threshold control switch, RT-thermal sensor, K1, K2-relay, EL- furnace light, M1-wheel motor, M2-fan motor, T2-high-voltage transformer, C-high....
The chicken male and female discriminator circuit is composed of the audio detection circuit, active band-pass filter and LED display circuit, and it is shown in Figure 4-11. Audio detection circuit consists of piezoelectric ceramic BC and resistor Rl, R2.....
The cumulative timer circuit consists of resistor R1 and spreadsheet internal crystal oscillator BC, and it is shown as the chart. R1 and R2 choose the metal film resistors: R3 ~ R5 select the 1/8W metal film resistors. C select the aluminum electrolytic....
The digital lock circuit is composed of the timing trigger circuit, trick lock circuit, sound and alarm circuit and control implementation circuit, and it is shown in Figure 3-101. Timing trigger circuit is composed of the transistors Vl, V2, resistors....
The ding-dong electronic doorbell circuit is composed of the power supply circuit, trigger control circuit, audio oscillator output circuit, and it is shown in Figure 3-125. Power supply circuit is composed of the power transformer T, rectifier diodes....
The ectronic fishing shrimp machine circuit is composed of the astable oscillator, inverter circuit, high voltage output circuit, and the circuit is shown as the figure 20. Astable oscillator circuit is composed of the time-base integrated circuit IC,....
The electronic locust killer device is composed of the square wave oscillator circuit and high-voltage generator circuit, and the cirucuit is shown in Figure 3-192. Square-wave oscillator is composed of the counting divider lC and resistors R5, R6, capacitor....
The electronic pests killing lamp circuit consists of the oscillator, control circuit, high voltage generator, LED indicating circuit and power supply circuit, and the circuit is shown as the chart. The oscillator circuit is composed of the time-base....
The fluorescent lamp electronic ballast circuit is composed of the rectifier filter circuit, high-frequency oscillator circuit and output circuit, and it is shown in Figure 3-202. Rectifier filter circuitis composed of the rectifier diodes VDl-VD4 and filter....
High speed optocouplers technical parameters are: Rise time t1 ‰¤ 300ns; Circuit eye transfer ratio CTR = 50%; Isolation voltage VSO ‰¥ 15000V; Output transistor reverse breakdown voltage V (BR) CEO ‰¥ 50V. The optical coupler can be widely used for the....
This circuit is an improved version of the circuit shown in Fig. 8-21. The hysteresis effect is eliminated by the addition of two diodes and the 5.1 -k? resistor. The RC network across the triac is a snubber to prevent line transients from accidentally....
The inductive electronic doorbell circuit is composed of the inductive electronic switch and music generator circuit, and it is shown in Figure 3-115. Inductive electronic switch circuit is composed of the inductive electrode A, transistor Vl-V4 and the....
The circuit work theory This infrared automatic hand washing device circuit is composed of power supply, infrared transmitting circuit, infrared receiving circuit and control circuit, the circuit is shown in the figure 9-121. The power supply circuit is made....
Keyer dimmer table lamp adopts two touch buttons to adjust the light. The light changes weaken from strong when peopletouch one of the buttons, and it changes strong from weaken when peopletouch the other button. Working principle The principle of this....
The liquid level controller circuit consists of the power supply circuit and level detection control circuit, and it is shown as the chart. Power supply circuit consists of the power switch S1, power transformer T, bridge rectifiers UR1, UR2 and filter....
This circuit uses the HgCdTe demodulation device which can be cooled to 77K in liquid nitrogen. It uses a constant current bias for the demodulation device which is connected to the input port. The voltage`s amplification factor is 200 and the bandwidth is....
The picture shows the ultrasonic liquid level indicator circuit. This circuit is made up of ultrasonic transmitter circuit and receiver circuit.The ultrasonic transmitter circuit is made up of 555, R1, W1, C1 and ultrasonic transmitter head UCM40T. The....
The application circuit shown in the picture below with output voltage higher thanreferenced voltage is composed of the W723 multi-port adjustable positive stabilizer. There is current limiting protectionin this circuit and the output voltage is adjustable....
As shown in the picture, when the output current exceeds 40mA the internal resistance 50? in the XTR110 (R9) should be replaced by external resistance REXT. REXT is connected between the 13 foot and 16 foot. REXY=R9(original span/required span). For example,....
This is a fm radio receiver circuit which can be used with PC.PC radio REGULATIONSA) With the P1 we regulate the intensity of sound.B) With the P2 we regulate the frequency of reception.C) Optionally: If you want to check the frequency with your PC it will....
The password electronic doorbell circuit is composed of the electronic password circuit and music occurred circuit, and it is shown in Figure 3-118. Electronic password circuit consists of integrated circuits lCl and keys Sl-S6, diodes VDl-VD5. lCl is the....
The password electronic doorbell circuit is composed of the trigger circuit and music generating circuit, and it is shown in Figure 3-119. Trigger circuit is composed of the buttons S1-S9, four NAND gate Schmitt trigger integrated circuit IC1 and the....
The electronic doorbell circuit is composed of the pickup amplifier, monostable trigger circuit, pulse counter circuit, music generating circuit and audio amplifier circuit and other components, and it is shown in Figure 3-113. Pickup amplifier circuit....
The politely welcoming electronic doorbell circuit is composed of the trigger control circuit, audio amplifier output circuit, music circuit, voice delay control circuit, and it is shown in Figure 3-122. Trigger control circuit is composed of the doorbell....
This circuit shows the high and mid part of car radio, and the medium wave band I is 520 ~ 950kHz, Poland II is 900 ~ 1640kHz. Loop tuning uses tunable diode BB113.Main coil data:L1: 122 turns; L2: 122 turns ; L3: 68 turns ; L5: 96 turns ( coupling coil with....
The receiver ( Figure a) input circuit is supplied by the 60? generator. Low -pass filter allows the entire frequency range with uniform sensitivity. Figure b shows the receiver input circuit coupled with transmitter inductive (Ri = 60?). Figure c shows the....
Separates 130-cps motor drive voltage from voice frequencies in output of adf receiver-P. V. Sparks, Servo Filter and Gain Control Improve Automatic Direction Finder, Electronics, 34:23, p 110-113....
Human approach detector circuit is composed of integrated operational amplifier, gate circuit and resistor-capacitor unit in the diagram. Among them, 1MHz oscillator consists of reverser T1, 1MHz crystal oscillator and resistor-capacitor unit. The oscillator....
The the loop antenna L1 for emission also serves as the oscillation coil, the high-frequency current flowing in antenna is synchronized resonance with the oscillation frequency, so it is always in the best emission state. Accoring to practice, launching....
This simple water detector circuit uses alternative voltage in order to prevent the corrosion of the electrodes. It is easy to build and uses N1 as a trigger Schmitt gate which generate the AC. If between the electrodes is a electricity conductor, for....
For the transmitter schematic (part of this transceiver), see entry entitled S-W ATV Transmit-ter for 440 MHz, Fig. 5-1. The downconverter portion is shown here.This transmitter contains both a video and sound section. Five to six watts PEP on synch tips of....
This low-power NTSC video and sound transmitter is useful for amateur radio, video handle-talkie, R/C and surveillance pur-poses. A crystal oscillator-multip lier RI` power amplifier. Video modulation is via a three-transistor series modulator. The sound....
TV video processor. The EGG 1134 contains a picture IF amplifier, avideo detector,a video amplifier,keyed AGC with noise immunity, delayed AGC for thetuner, an AFT amplifier, a sound IF amplifier, asound carrier detector, a4.5 MHz sound carrier amplifier and....
Light-Operated Ring Circuit Average telephone ring circuit is composed of KA2401 and peripheral components. When adding light-operated ring circuit, just connects the part X in picture a with light-operated circuit in picture b. When there is input of AC....
Ring current generator The ring current generator can produce a ringing current voltage of 75-90V and 25Hz±5HZ. It is available to be used for vibrating ring in communication devices, for example, carrier, ultrahigh frequency, wire telephone. It can also be....
Simple telephone time lock circuit is shown in the above picture. In the circuit diagram, BG1 and BG2 are electronic switches controlled by IC NE555. When the telephone is on-hook, the DC resistance value of the telephone is over 600K?, the current when the....
Simplified long-distance call lock is shown in the above picture. The lock can lock out the long-distance call without affecting the original function. It ispower-consuming, but it has very good compatibility. If switch K is placed as the picture shows,....
Using an AMI chip P/N S2561, this telephone ringer can be powered line. Audio output is about 50 mW when powered from a 10-V source....
UM95088 telephone circuit diagram is shown in the above picture. UM95088 is specialized integrated module of dual tone multiple frequency for telephone dialing. It adopts the techniques of CMOS with dual-in-line package of 14 pins...
Tro telephones can be used as an intercom by using this circuit. Older style rotary phones that are nonelectronic might work best in this application. Also, handsets only might be powered this way....
