Popular Circuits Page 124
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A number of shunts and multipliers selected by a switch can be used in association with a single basic meter to form a multirange instrument, known as a multimeter. this is capable of measuring volts, current and resistance. A multirange meter can be....
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I have a 05 wildfire 250 qac i think thats wat it is. mine wont start either. When i try to start it it sounds like the gears from the starter to the other gears are just spinning. I got mad and flippied it the one day and ever since theen its been like....
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This project, based on an article published in the February 2008 edition of Radcom (the magazine of the Radio Society of Great Britain) is for a meter with a 50 ohm input impedance for measuring very small RF powers. Many RF power meters become inaccurate at....
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This is a three-modes lamp dimmer circuit with touch control. This circuit can be used to control a lamp in 3 operation modes: dim, off, and bright. A NE555....
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It is possible to build a three-phase sine-wave oscillator using just one UAF42 state variable filter along with some resistors and diodes. Three output nodes are available: high-pass out, bandpass out, and low-pass out. The signals at the bandpass and....
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A water Happy Valley -type four flashing lights string controller, electric bollard fp is a star for the use of a type j Ding Japanese lantern s 123 control specific integrated..
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2SC1815 Flip Flop LED Flasher Suite A very simple and very easy to understand....
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This a very simple and inexpensive circuit that can be used to test quartz crystals. Here a Colpitts oscillator is wired used the transistor T1. When the crystal is connected between terminals A and B the circuit will produce high frequency oscillation. The....
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The capacitor charges until the PNP transistor (here shown as a 2N3906, but you could also use a BC327) receives base current through the Zener and turns on. Then the NPN transistor (here shown as a 2N3904, but you could also use a BC337) turns on and....
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The two optical sensors will give person count to the microcontroller and microcontroller will give this value to MCU-II. The microcontroller will sense the entrance of any person from high to low pulse on input pins (A3 and A4)..
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Build a Wien bridge oscillator that oscillates at 2. 1kHz and that can be switched on by a transistor. The reason for me placing a transistor switch in the circuit is so that I can turn the oscillator on and off from a PIC MCU. However, when I build the....
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Create a PC synch cord off of the extension cable by putting in a connector and having different plugs on the opposite end. So if I read this correctly, you could create a PC synch cord off of the extension cable by putting in a connector and having....
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Here is some experimental hardware and software to transmit and receive AX.25 packets.
It is essentially a PIC-E clone designed around a Atmel AT90S2313 with a few extra bells and whistles.
I had picked up a couple of MXCOM MX-614s at the TAPR display (I....
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A resonance-tuned narrow-band amplifier reduces this optical object detector"s sensitivity to stray light. C1 and L1 in IC2A"s feedback loop cause tbe op amp to pass only those frequencies at or near the LED"s 5-kHz modulation rate. ..
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The parts to the right of T1 form a simple Joule-thief ('Blocking' oscillator) circuit which boosts the 1.2v supply to 3.5v to operate the LED. C1 is used to extend the charge and discharge cycles to increase brightness and efficiency. Components R, C and....
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This is the scheme diagram of 500W power inverter circuit which build using 10 pieces of well-known NPN power transistor 2N3055 to amplify the AC signal produced by multivibrator. The frequency generator / multivibrator is built based on transistors too. All....
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A very simple direct conversion receiver based on the NE602 Gilbert Cell mixer and a LM386 audio amplifier. The circuit is based onthe famoussudden receiver design from the Rev George Dobbs G3RJV many years ago and looks something like this: My....
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This is a design schematic Class A power amplifier. This is a close as possible in operating parameter the Under Classes is class B, to aid comparison ; in particular the NFB factor remains 30dB at 20 kHz. The front end is similiar to class B amplifier. This....
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The ADRF6702 TxMod is an IQ Modulator with integrated PLL and VCO The PLL Synthesizer uses a Fractional-N PLL to generate a 2*FLO input to the I-Q Modulator The PLL reference input is supported from 12MHz to 160MHz. The phase detector output controls a....
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Working principle: Two pairs of photoelectric detection devices are installed in the access channel. On one side the light source A (transmitter) and the photoresistor LDR1 (receiver) are installed in the entrance of the channel; on the other side, the light....
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The circuit uses (RGB) Red, Green and Blue high brightness LEDs that are pulse width modulated (PWM) to vary the intensity of each colour LED. This allows effectively any colour to be generated with rapid changing strobe effects, fast and slow colour fades....
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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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In this circuit, A = 1, port = o.5, passive vent filter without distinction. When only care when dry l; Q = 1 / (3 - A), 12dB / oct filter of Butterworth King F0.707,4 mouth may be assumed ..
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Mark Harrington Audio Tracer. The audio input is fed into the first stage op amp via C6 , RV1 , C4, R4....
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This mixer is built around a TL072 dual BiFET op amp with a JFET input stage, and can be powered from a single-ended 9-to 18-V power supply. The microphone input is capacitively coupled to the noninverting input of U1a. Resistors R1 and R3 set the voltage....
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Here`s how you can make an electronic speed controler (ESC) for your remote control car, boat or even an airplane using an old servo and some MOSFETS. Please note that this ESC has a very limited control range. Meanining that it will act almost like but....
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Figure 1 shows distortion variations in red and violet. Notice how the violet wave follows the green wave perfectly during its positive excursion but falls short of the mark during the negative swing. The red wave is more symmetrical, but does not "clip"....
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Tone Control. Parts: Part Total Qty. Substitutions C1, C3, C5, C7, C15, C16 6 2.2uf Electrolytic Capacitor C2, C6 2 0.05uF Ceramic...
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Combination of source is grounded and the emitter follower The source is grounded and the emitter with Chong device (common-collector transistor amplifier) combination. As show..
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The circuit in Figure 1 converts
pulse information to a clean dc voltage
by the end of a single incoming
pulse. In another technique, an RC filter
can convert a PWM signal to an averaged
dc voltage, but this method is slow in responding.
Converting....
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A four channel DMX512 controlled ringer. The Mk 3 will also incoporate a ringing supply generator, and thus be reproducible by others not in posession of the BT ringing supply Number 7. The ringer is microprocessor controlled, using a Parallax Propeller....
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You'll find here few ASCII schematics for Heath and Marantz tube crossovers. They were given in L'Audiophile No 11 old sery July 1979. In the same paper there is another tube crossover designed by Gerard Chretien now at the head of Focal i'll try to....
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Most off-the-shelf car battery chargers cannot not be left connected to the battery for long periods of time as over-charging and consequent battery damage will occur. This add-on circuit is placed in series with the battery being charged and is powered by....
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Alarm interface circuitry. As shown, the two-color light-emitting diode display. When LAi is high level t and LBi is low, the green light-emitting diode display; on the contrar..
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This circuit uses just two CMOS IC`s, a 4011 quad 2 input NAND gate, and a 4020 14-stage ripple binary counter. At switch on R2 and C2 provide a brief reset pulse, which will ensure the output pin Q1 of the 4020 is high. Gates U1 and U2 form a simple astable....
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Electronic scales have come into wide use and the HA-510X, as a very low noise device, can improve such designs. This circuit uses a staingauge sensing element as part of a resistive Wienbridge. An auto-zero circuit is also incorporated into this design by....
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As shown in FIG gear lathe unloaded from the stop line. When turning clutch in the stop position, the limit switch XWK is breaking, AC contactor coil C power immediately, stop ..
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This circuits allows you to use a cheap loudspeaker as a microphone. Sound waves reaching the speaker cone cause fluctuations in the voice coil. The voice coil moving in the speakers magnetic field will produce a small electrical signal. The circuit is....
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The expansion board had 6, but I didn`t think that 6 servo ports were worth the price of the expansion. I ended up making a fully reversible modification to my handyboard that gave me 16 servo ports costing a total of about $2, two of the motor ports and a....
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A thyristor is like a diode; it can pass electricity in a forward direction but, blocks it in a reverse direction. The difference between a diode and a thyristor is that the thyristor is a three terminal device consisting of an anode, cathode and gate, which....
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How to make the tally light work on the F15 camera viewfinder when you don`t have the CCU/RCU....
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Basically, this circuit is an adjustable electronic circuit breaker, containing a toroidal transformer that senses 60-Hz load current. Tl has a two-turn winding for primary, and 100 turns of #30 gauge wire for the secondary. A high-low range switch selects....
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Reverse engineered circuit diagram of a commercial Electronic Bird. This one was built into a plastic christmas ornament and runs off a 9V battery. Note that L1 is actually just an audio transformer with an unused secondary winding...
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Please note that it is illegal to make a physical permanent connection to your telephone linein some countries (this includes the UK and Ireland). If building this circuit it is advisable touse a plugin cord so that the unit can be unplugged should a fault....
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To protect downstream circuits from overvoltage conditions that show up during load-dump events or transients, we can use the MAX6495MAX6499/MAX6397/MAX6398....
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The SL561 used in this circuit is a high-gain low-noise preamplifier designed for audio/video applications at frequencies up to 6 MHz. Figure 2-6B shows gain versus frequency for various values of C1, and Fig. 2-6C shows gain versus various values of RSET.....
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The GX434 is a high performance low cost monolithic 4x1
video multiplexer incorporating four bipolar switches with a
common output, a 2 to 4 address decoder and fast chip select
circuitry. The chip select input allows for multi-chip paralleled
operation....
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A schematic diagram of a touch switch circuit is shown below. This circuit consist of timer, one shoot multivibrator and touch terminal. As timer, this circuit uses 555 timer which is connected to one-shot multivibrator. The touch terminal is used to trigger....
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The MC74HC04 IC is a low cost CMOS Hex Inverter. I used this type mainly because, it is what I have, although you can use LS type but, with a little modification or exemptions....
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The voltage-to-current (V/I) converter in Figure 1 uses three common op amps, two medium-power transistors, and only a few passive components. The first op amp (IC1) inverts the sum of voltages VIN and VOUT to V1=-(VIN+VOUT). The second op amp (IC2) and....
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One Advantage of these two units is the Sensor can be placed Away from the heater, therefore sensing the Actual Room temperature, not the direct heat from the heater. These can also be used in a confined space with a Heat Lamp, to create a Drying Oven. This....
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Here is the circuit diagram of an excellent stereo preamplifier with tone control using the IC TDA1524 from Phillips. The IC requires very few external components, has very low noise and has a wide power supply voltage range. POTs R1 to R4 can be used for....
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Remotely controlled light dimmers in theatrical and architechtural applications use 0-10V control signal for controlling the lamp brightness. In this case 0V means that the lamp is on and 10V signal means that the lamp in fully on. A voltage between those....
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This is a really simple sound effect generator based single sound generator chip UM3561. The UM3561 will generate four kinds of sound effects. The basic operation is that the UM3561 will generate the sound signal, then the signal delivered to 2N3706 (as....
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Here are 2 heat sensor circuits, first one is build with the 4060 IC, the second one is simpler than the one before and has fewer components. It is an idea....
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Battery Charger in general can be interpreted as a means to recharge the battery charge. Principles of good charger circuit is capable of providing resources to perform effectively charging the battery, efficient and safe. AVR-Based Battery Charger ATMega....
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Due to the rapid development of integrated circuit technology, an integrated circuit amplifier also come out in large numbers, its technology and performance indicators have re..
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Input, voltages can range from 8 V to 30 V. The load range on the 5 V is 0,05 A to 5 A while the 3.3-V load range is 0.1 A to 1 A. The circuit is self-protected under no-load conditions. Over all load and line conditions, .including cross regulation, the....
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The circuit shows the method of `mirror` current sensing a MOSFET. A fully conducting MOSFET is resistive and behaves exactly as a resistor. It therefore you limit the voltage across the MOSFET when it is conducting you automatically limit the current....
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These circuits are often used in robotics to allow DC motors to run forwards, backwards and to give electric break(short circuit condition). H bridges are available as integrated circuits, or can be built from discrete components as figure 1...
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The Lambda II is based upon the Atmel 8535 chip, which operates at 4 MHz and contains 8K of RAM. This chip was chosen over other brands such as Motorola or Pic, because the circuit used to program it using a computer is very simple to build. This results in....
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The circuit shows a simplex fiber link between the NE5080 transmitter and the NE5081 receiver. The components shown are for a center frequency of 5 MHz, although this frequency can be increased to 20 MHz with proper selection of external component values.....
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This converter may help if just the serial port on a personal computer is free, whereas the printer needs a parallel (Centronics) port. It converts a serial 2400 baud signal into a parallel signal. The TxD line, pin 3, CTS line, pin 8 and the DSR line, pin....
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This circuit is the basis for the dimmers in a model theatre lighting system which uses touch globes as the light source. The circuit is based around a 555 timer, driving a Triac. All dimmers share the one power supply and zero-crossing detector. As it will....
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Designing a PLL synthesizer for modern mobile communications systems involves achieving the proper balance among a number of tradeoffs, including spurious levels and frequency switching speed....
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Electronic devices love accuracy. If you give them the same task twice, you will get the same resault. But sometimes you want some random result. This can be used in games. You can create your own lottery game. We will help you to do that kind of game with....
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The circuit provided in this article shows you a simple way of building a useful liitle inverter thats easy to build and yet provides the features of a pure sine wave inverter. The circuit can be easily modified for getting higher outputs. The input stage....
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Drive a four line LCD panel from an Arduino. The project started out as a way to drive the LCD to display arbitrary information, but then evolved into a way to tell the time, read and write the EEPROM from the Atmel 328p, and measure voltage. I`m using many....
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A photocell circuit provides automatic threshold adjustment. Monostable action prevents undesired retriggering of the output. With only one op amp IC, the circuit offers: Automatic adjustment of its trigger level to accommodate various light sources, changes....
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Hi I need help with design of a FET based wien bridge oscillator and simulate it using pspice. Any suggestion?....
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The circuit requires an RF input which can be from a longwire or a loop antenna. The Preamplifier has a range from 550kHz (Medium Wave) up to 30 MHz in the SW band. The input Switch S1, applies voltage to a set of relays which switch in the appropriate....
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Here`s a circuit to create a buzzcoil using a standard automotive ignition coil. A 556 dual timer is used to establish the frequency and duty cycle of the coil current. One of the timers is used as an oscillator to generate the 200 Hz rectangular waveform....
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This interface circuit provides electrically isolated RS485 communication inteface to the PC serial port the isolation circuit protect the PC from direct connection to hazardous voltages...
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In both circuits, the SCR (and thereby the lamp) can be latched on by momentarily closing SI, thereby fe..
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IR Beam Breaker Circuit Diagram. This is an Infrared beam breaking alarm ideal to use in entry or passages. It is based on the working of the popular IR sensor Module TSOP 1738 which senses 38 kHz Infrared pulses from the IR LED of the transmitter. Range of....
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The bi-directional sequencer uses a 4 bit binary up/down counter (CD4516) and two ""1 of 8 line decoders"" (74HC138 or 74HCT138) to generate the popular ""Night Rider"" display. A Schmitt Trigger oscillator provides the clock signal for the counter and the....
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This circuit is basically a system that generates a pulsed modulation signal for a Gunn diode microwave oscillator. Several speed settings are preset (S3 a and b). A 555 timer is used with a frequency divider chain to produce Doppler shift equivalents of....
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Many applications require control signals that have phase shifts with reference to an input signal. Circuit accepts a sine, square, or triangular wave as an input reference signal and produces square-wave outputs with 0", 90", 180", and 270" phase shifts....
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Here`s how to make a good charger for a sealed lead-acid battery (this will NOT work with NiCad batteries) that`s faster (because it allows more current into the battery initially) and safer (because it uses lower voltage when the charging is finished). The....
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This logic probe uses a CD4009 CMOS hex inverter. The characteristic high-input impedance of CMOS gives the advantage..
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DC motor-generator speed closed loop control utilizing UC3637 internal error differential amplifier EA, after tachometer generator speed voltage signal is filtered with the spe..
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Create a new project by selecting the New Project option from the Getting Started menu or by selecting Select File > New Project. This brings up a Dialog box where you can enter the desired project name and location. Choose a meaningful name. You can also....
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This circuit would be mounted in a small plastic or preferably metal box, with a 9V battery, level control, a male XLR connector (same as on a microphone) and a switch. Current drain is low, since the circuit only uses one dual op amp. There is no need for a....
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The circuit receives its power from a 15-V wall adapter (not shown). The circuit takes advantage of the fact that th..
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Also known as no-shot multivibrator - often used as a pulse (square wave) signal sources. Astable flip-flop is a strong positive feedback amplifier, its two branches are couple..
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Figure 1-122 is a dedicated high-fidelity surround sound processing IC TDA3810 circuit consisting of surround sound. Stereo signal via the input coupling capacitor cJ, C2 input..
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Circuit shown in Figure 3-150. When shut down, the contactor KM1 released. KMz pull, 220V AC power supply through the diode VDi, VD2 rectifier, the motor primary and secondary ..
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