Popular Circuits Page 77
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The spectrum analyzer circuit takes a stereo input and displays a volume by
frequency display on a standard PC monitor. Finding the amplitude of a waveform at
each frequency and then mapping this to the screen using a discrete number of levels
achieve....
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As shown in Figure 3-30 to promote the use of IC LA4425 stage power amplifier, a pair of power module 1490 as a push-pull output, since the impedance converter, whether the spe..
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This model is very simple and charges as long as you hold the pushbutton:..
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As shown in Fig ten temperature detection circuit circuit. The detection circuit by the temperature sensor, V/F converter circuit, an oscillator, circuit testing program contro..
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The ATA5743 is a multi-chip PLL receiver device supplied in an SSO20 package. It has been especially developed for the demands of RF low-cost data transmission sys- tems with data rates from 1 kBaud to 10 kBaud in Manchester or Bi-phase code. The receiver is....
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Boiler control circuit for controlling the temperature of water in the hot water heating system, often used comparator s comparison function to control the heating equipment. I..
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Many application requires large number of keys connected to a computing system. Example includes a PC keyboard, Cell Phone keypad and Calculators. If we connect a single key to MCU, we just connect it directly to i/o line. But we cannot connect, say 10 or....
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Earphones, batteries are sold separately. AM / FM seems to be a common mold. But stamping is different. AM / FM E193577 UL94V0 board with the AM / FM etching printed circuit board manufacturers are the same. Shape is considered to be shared. (Design, sharing....
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The circuit is a modified Colpitts oscillator, tuned with MV209 varactor diodes. The resonating inductor and the drain choke are selected by a rotary switch. 1N5711 Schottky diode, D, clamps the maximum positive voltage on the gate of oscillator FET, Q1 to....
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pump prime connector, power distribution cell, fuel pump and sender, dual tanks, fuel pump balance relay, vahicle control module, underhood fuse relay, ECM fuse. ..
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Another feature of this circuit is that you can use the keys "1, 2, 3, 4" of a Philips TV IR remote to turn on or off three relays, The key `4` is used to turn on or off the over temperature alarm. package. LM35 can sense temperature from 0 C to 100 C but it....
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This is a simple audio amplifier circuit fabricated around BEL1895 1W audio amplifier IC. This circuit is alternative of the complicated audio amplifier circuit for portable radio receiver. No driver circuit for loudspeaker is needed with the facilities of....
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The UHF motion detector below operates on the Doppler radar principle. A radial signal is created by the oscillator (Q1). Some of this energy is reflected back....
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Mixers (sometimes known as frequency converters), modulators, balanced modulators and other circuit blocks are considered below. Each works on the same basic principles. A mixer circuit normally has two inputs - from two separate signal sources. In the....
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Because of this audio mixer, I can compare the various receivers just by twiddling the gain controls. No switching required. Makes A/B comparisons a snap. (They are all driven by the same antenna). All of this used to be easy I just used a different speaker....
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Indicator provides an accurate comparison of two voltages by indicating their degree of balance (or imbalance). Detecting small variations near the null point is difficult with the basic Wheatstone bridge alone. Amplification of voltage differences near the....
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Another simple connection delay lamp circuit. Turn on the lights, press F SH, power supply by SH, VD. The capacitor (rapid charging, thyristor VT opened, lamp E lights up. Loos..
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The programmable multiple output generator provides the control signals for data converter ATE. Major performance criteria are simple, interfaces to a number of microprocessor systems, low power consumption, stable output timing relationships combined with....
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The Hopping Decoder is used together with the Hopping Encoder device to decode address data, key data and rolling data. It uses the DES24 encryption algorithm decoding format. Because each time the Hopping Encoder key is pressed, the rolling data will....
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hi here is new models 3 digit cc and ca dispaly multiplexed 3 didgit voltmeter chip TC7107(ICL7107) Thumb switch with commom pin bcd and hex regards....
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With 3-V to 9-V supplies, this amplifier can provide from 100-mW to 1-W output into a 4 and bandwidth is approximately 20 kHz @ 3 dB. This circuit is useful for low-power and battery applications...
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The Tutorial shows how to interface 7-segment display to a microcontroller. Also explains how do display more than one 7-segment on same data lines using scanning method. 7 Seg displays are are basically 7 LED's. It will be much easier to understand if you....
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A delay by the improved quenching lamp pull switch, its performance and the example described delay lights care line switches, but the work of a high degree of stability and go..
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The circuit as shown act as a light detector. Under normal conditions the resistance of the LDR is high, keeping pin 2 low. When light falls onto the LDR the resistance drops to a couple hundred ohms and triggers pin 2 high which biases the base of Q1 via....
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The debate still goes on as to which are better, valves or transistors. We don`t intend to get involved in that argument here. But if you can`t make your mind up, you should try out this simple amplifier. This amplifier uses a valve as a pre-amplifier and a....
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This circuit is designed to be used in conjunction with the standard 4 foot square loop used in MW for long distance reception...
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As shown for the trap circuit. The circuit uses a high-performance op amp device MC33171 constitute trap. The device has a wide band and a high conversion rate. In the illustra..
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This device 'listens' to a conversations and then interjects words and phrases at inappropriate times. I got this box at a local thrift store for $1.50 (special, this week only). It has a nice hinged top and a place to insert a panel with a designed glued....
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This circuit uses a single chip, IC TL074 for achieving a 5-band graphic equalizer for use in Hi-fi audio systems. The 5-band graphic equalizer is true for radio-cassette player, and car stereos. This unit features: low distortion and low noise, wide range....
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Audio levels can be monitored using a small panel meter with this circuit built from discrete components. The circuit has a flat frequency response from about 20Hz to well over 50Khz. Input sensitivity is 100mV for a full scale deflection on a 100uA meter.....
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The image below shows a Block diagram of the entire mixer that includes four Input Amplifier Modules followed by four in-out switchable Tone management Modules, one stereo Line input, four mono Main Faders, one stereo dual-ganged Main Fader, four Pan-Pots, a....
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Analog-to-digital converters are classified into one-step architectures, such as: flash, folding and interpolative topologies, and multi-step architectures, such as: Successive approximation and pipeline topologies. The flash architecture is potentially the....
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Circuit bellow shows about LM741 IC for Light Dark Sensor Circuit diagram. This circuit have a many features, among others: 1 Watt LED spotlight, advantageous and able in a advanced ambit of renewable activity projects from automated lighting to aegis....
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This simple adapter uses an oscillator (567) to drive a counter (U2) and switch (U3) that selects the outpu..
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The following diagram is the battery charger schematic for 6V Gel Cell battery type. Component Parts List: R1 = 22 ohm, 1W R2 = 270 ohm R3 = 220 ohm *R4 = 715 ohm, 1% *R5 = 3. 57K, 1% *R6 = 1. 40K, 1% *R7 = 1. 47K, 1% C1 = 0. 1 F, ceramic C2 = 0. 1 F,....
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i am going to programmer my atmeg8515 Mc and i am searching for good and easy parallel programmer for it also i want to know the assembly instructions ....
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This Mini FM Bug Detector is basically a broad-band receiver. It picks up the complete band from below 80Mhz to 150MHz and almost anything that transmits in that band will be detected. If a bug with a sensitive microphone is transmitting nearby, the result....
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The water resource is being turned into a valuable rare resource. So, popularizing the water-saving irrigation has already become countries all over the world in order to relieve the water resource crisis and realize the inevitable choice of agricultural....
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Optically isolated SMPS and dc-to-dc converters face the variance of output voltage owing to the change of transmission c..
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The search coil, CI and C2 form a tuned circuit for the oscillator which is tuned near the center of the broadcast band. Tune a portable radio to a station near the middle of the band, then tune C2 until a squeal is heard as the two signals mix to produce a....
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I bought one CI-22BG tube and one CI-3BG tube for total of 16G. Because I didn`t have anything radioactive to test my Geiger counter, I also ordered a piece of radioactive Fiesta dinnerware from ebay. Red Fiestware used to have uranium oxide in its glaze....
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There is one slight drawback to our flashing LED program. Each instruction takes one clock cycle to complete. If we are using a 4MHz crystal, then each instruction will take 1/4MHz, or 1uS to complete. As we are using only 5 instructions, the LED will turn....
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This project arises from the need to home-build a valid tuning control for a multi band transceiver.
It consists of a partial syntesis V.F.O. that fits to single conversion equipments with an I.F. stage
nearby 9 MHz. The circuit can cover the whole H.F.....
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This circuit is a simple adapter for PC parallel port to think that there is a printer connected to computer. This adapter is useful for testing printing speed with different software and as a part of your own designs. You can use this circuit to connect....
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60MHz Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is extremely useful bench test equipment for testing and measuring frequency of oscillators, transmitters, radio receivers, function generators, crystals, etc.....
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The following circuit shows about MC14093B Fluid Level Sensor Circuit Diagram. Features: compact and simple, single-chip circuit, for a wide range ....
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This application note details the design of a 50-watt, isolated, forward converter, using the MAX8540 synchronizable, high-frequency, current-mode PWM controller....
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Many of us who use GTX 900 MHz radios to work amateur repeaters are well aware of the erratic output power problem. You go through the complete board replacement procedure, adjusting the deviation and output power, and everything looks great on the test....
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Most audio tone controls affect midband gain, and !bey often create booming or hissing sounds when activated. You can avoid tbese problems by using a dual Wien-bridge filter to provide independent control of tbe treble and bass frequencies. Experiments....
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Circuit shown in Figure 3-194. Motor is re-excitation type DC motor. The motor has six terminals, sl, S2 for the armature windings; cl, cz for the series excitation (field) win..
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This electronic lock can be used with any type of iButtons you may already have, since the only thing needed is the internal serial number, that's different for every iButton. The command used to read the serial number is the same for all iButtons. The....
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Studying current measurement is a prerequisite for many of the measuring techniques. The current parameter mainly specifies the power consumption in a circuit, given the value of resistance. It is found convenient to measure current rather than voltage for....
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The modulator and the demodulator (pdf < 10 kb). For the easier tuning of the modem it could have been built with potentiometers, but it was easier to reach a smaller size this way (I didn`t want to use SMD potentiometers). Unfortunately, even like this, the....
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If the voltage at the input exceeds the voltage on the capacitor, then the output of the 741 goes positive, the diode conducts, and the capacitor is charged up to the input voltage-forward voltage drop of diode. When the voltage at the input is less than....
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Ethernet is the most widely used networking technology with high reliability, media informative, easy to expand and update, etc., in businesses, schools and other fields are wi..
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Power your three FSRs (or any other analog sensor) with 5V in parallel. Connect each sensor to analog pins 0-2, using a 10K resistor as a reference to groud on each input line. The sketch below reads three analog sensors. Each corresponds to a note value in....
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Originally Posted by T-1000 In regards of cold electricity it is exactly what Duncan says. In our experiments we got burning wires from Tesla....
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To sense and control the current in stepping motors and other similar devices, we can use a linear integrated circuit like L6506. The chip set forms a constant....
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A 12 Volt high current 20 Amp power supply. The output voltage is variable from 12. 2 Volt to 14. 4V so can be set for any device requiring voltage and current in that range. This PSU uses an LM723 as the regulator, 4 parallel connected outboard pass....
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Data acquisition applications that require low power dissipation
fall into two general areas: products that must use
power very efficiently, such as battery-powered portable
test equipment, and remotely located data logging equipment.
To help meet these....
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This circuit consists of two basic parts: an oscillator tuned to 40kHz, and a voltage doubler with pulse generator. The pulses are about 10 ms long and occur 2-3 per s to reduce battery drain and increase the annoyance factor for a cat, dog, hedgehog, etc. ..
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This oscilloscope clock project uses a PIC 16F876 and a DAC to generate X and Y signals to draw a clock on the oscilloscope. The original circuit and software was designed by OZ2CPU, which can be found here:. The clock circuit was slightly modified to use a....
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Also known as the stairstep-ramp , or simply counter A/D converter, this is also fairly easy to understand but unfortunately suffers from several....
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Digital circuits are circuits dealing with signals restricted to the extreme limits of zero and some full amount. This stands in contrast to analog circuits, in which signals are free to vary continuously between the limits imposed by power supply voltage....
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A laser trip wire that actuates a camera. An ambient light sensor by Vishay, the TEMT6000 [ datasheet ] from Sparkfun Electronics, acts as an NPN transistor attached to a 555 in BiStable mode. The output is sent to a logicinverter for quick visual status,....
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The problem with using two zeners back to back in series to get symmetrical clamping is that the knee of the..
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I have successfully used a 4511 IC to make numbers 1-9 appear on a 7 segment led display, cool. Now how can I use this to say have it display a number ....
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This accessory connects to phone and will activate an attention-getting 120-V bell whenever a ringing voltage appears on the ph..
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555 Variable Frequency Square Wave Generator This simple 555 Variable Frequency Square Wave Generator produces a variable frequency output of....
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I love the Arduino as a simple and accessible controller platform for many varied projects. A few months ago, a purchased an Ethernet shield for my A....
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Electronics cricket game circuit shown in this website is very simple and easy to build circuit diagram of electronics cricket project various game project ...
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Q is the transistor, L1, L2, C resonant circuit formed, L2 double as feedback network, through the coupling capacitor Cb will be sent to feedback voltage transistor base. Figure 2 shows the communication channel, resonant circuit with three endpoints and the....
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A Microchip PIC12C508 8-pin CMOS Microcontroller turns a night light on and off with preset time everyday. Save Energy, No EMI, No Battery, Built-in Lamp Fixture, and Peak Shaving It`s time for 8-pin microcontroller Microchip PIC12C508, the SAVER V3. 2, my....
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As shown for the PGA202 offset voltage correction circuit. PGA202 offset voltage correction circuits for input offset voltage and output offset voltage is corrected. Since ther..
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Originally Posted by CDRIVE Thanks for clarifying that. Since you have a dual (+-) supply a SPDT relay will suffice. Do you want a solid state....
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This low-cost short-wave transmitter is tunable from 10 to 15 MHz with the help of ½J gang condenser VC1, which determines the carrier frequency of the transmitter in conjunction with inductor L1. The frequency trimming can be done with VC2. The carrier is....
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The following circuit shows about? Remote Control Toy Car Schematic Circuit Diagram. Features: does not impose on the performance of the original ...
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This example shows how to make use of the Watchdog and Sleep functions provided by the ATMEGA 168 chip. These functions are useful if you want to build low power consuming devices operated by battery or solar power. The reduced power consumption is achieved....
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Amplifier circuit here is all based on the ic in the gains. Three IC TA7230P, TA7236P, TA7237AP is intregated circuit (IC) which was applied to the power amplifier. Each IC has a different output, different input voltage, all IC TA7230P, TA7236P, TA7237AP is....
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An automatic brightness adjustment is a closed loop system that has the capability to assess ambient light and adjust the brightness of the display accordingly. In ....
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The circuit tests a flyback transformer of the televisions that the result is a simple, easy and cheap to build. One of my friends is TV repairman colors -....
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a typical rf amplifier that is used in an AM radio receiver. In figure 2-19, the input circuit is the antenna of the radio (L1-a coil) which forms part of an LC circuit which is tuned to the desired station by variable capacitor C1. L1 is wound on the same....
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As shown in Figure is a dual three-phase power line circuit from the vote. When electricity at the same time closing the knife switch 1HK and 2HK, 1C normally closed contacts d..
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