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Ed Skilling recounts his meetings with Lester Hendershot and offers details of the mysterious Hendershot Motor....
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This circuit is similar to the one above but uses positive feedback to get a little more amplitude to the speaker. I copied it from a small 5 transistor radio that uses a 25 ohm speaker. In the circuit above, the load resistor for the driver transistor is....
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After some time of no building activity, the dark afternoons and less busy week-ends has come finally. Perfect time of the season to build a new rig. See what is being done on my bench. I like this way of start, because of easy modelling a components layout.....
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The transistors Q1, Q2, Q3 and Q4 form the bridge circuit. Generally these are power transistors capable of handling high current. Q5 and Q6 drive the bridge. when the `A` is made high and `B` low, transistor Q5 is on and it makes Q1 and Q4 on. The current....
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Voltage regulator ICs (78xx series) provide a steady output voltage, as against a widely fluctuating input supply, when the common terminal is grounded. Any voltage about zero volt (ground) connected in the common terminal is added to the output voltage.....
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This 555 timer circuit toggles a relay when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply voltage by the two 10K resistors. When the output is high, the capacitor charges through the 100K resistor, and....
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A DC motor worksby converting electricpower into mechanical work. This is accomplished by forcing current through a coil and producing a magnetic field that spins the motor. One technique to vary the speed of a DC motor is by varying the voltage on the coil.....
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C1 takes the DC decoupled voltage from the Microphone, amplifies this via Q1, C2 decouples it again, then R6 and C3 Low Pass Filter it, but once we get to Q2, Secondly how does this circut actually accomplish frequency modulation: Please use math on me! (I....
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This circuit, enclosed into a small box, is placed in the fridge near the lamp (if any) or the opening. With the door closed the interior of the fridge is in the dark, the photo resistor R2 presents a high resistance (up to 200K) thus clamping IC1 by holding....
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Current mode amplifier has the benefit of higher frequency operation, and LM359 comes as operational amplifier with this type op amplifier. Current mode....
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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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Current loop interface has been widely used in industrial environment because it`s robustness. Noise resistance and fail detection capability? made it suitable...
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A simple Hi Fi amplifier circuit diagram with schematic for making audio amplifier,design using TDA 2616 IC, which is a stereo power amplifier, useful for radio,tape and television. Delivers 2*12 watts net 24 watts...
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Here is to introduce the LED car voltmeter which is made of the op-amp LM312 and LED, it can display 6 gears of voltages, 10-15V, each gear is 1V. The working principle of the circuit The LED car voltmeter consists of the regulator circuit, Vref circuit,....
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While most commercial grade signal generators offer more than just outputting a sinusoidal waveform, they are quite pricey for casual use. In this article, I will show you a simple wide band signal generator that is built around a Linear Technology`s LTC6905....
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A 12V supply is connected to the 12V positive wire, the current flows through a protection diode and a capacitor, in order to filter the voltage into a smoother flow. The zener resistor (R5) limits the current flowing to the zener diode, which regulates the....
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Most of the strobocopes designed for commercial use (light effects, theatrical lighting, DJ-lights) have a external trigger connectors on the back of the strobocope. Those connectors trigger input are typically 6. 3 mm jacks or XLR connectors. Sometimes....
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This project demonstrates a number of aspects of the PIC16F687 microcontroller, like: ultra low power wake up, serial communications, nanowatt technology etc. The device can be used for different purposes. For example: measuring the content of a rain water....
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These little devices had a 1. 5 inch 128x128 colour TFT as well as USB, batteries and 16 Mbytes of storage for around 140 pictures. Best of all they were very cheap, so I purchased a few to see if they could be re-purposed into something useful. Looking on....
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The preamplifier is very simple. I used a Low Noise integrated circuit manufactured by Hewlett Packard. The device name is MGA86563. It has a Noise Figure of about 2dB and can be used from 0. 5 GHz to at least 6 GHz. The gain is about 20-22dB at 2. 3 GHz.....
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This dual polarity power supply is easy to build, requires few parts, and is adjustable from 0-15 volts. It is great for powering op amp circuits, as well as other circuits that require a dual supply voltage. 4. U1 and U2 can only go down to a minimum of....
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This ac to dc power supply can output 5A in continous operation and 12A peak current. This kind of dc power supplies uses a PCB so you can use two case typ....
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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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After the wizardry that is our standard renegerative front-end receiver circuit, we will be able to see some initial output receiver from our transmitter. The point in the schematic we`ll look at first is right after the LC tuning circuit and DC blocking....
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This is a simple and easy to construct digital dice circuit. The circuit is based on a single IC, CD4060B. The dice consists of six LEDs marked D1 to D6. The number of LEDs glowing indicates the numeral. The heart of this circuit is 14 stage binary ripple....
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This IC require less external components too, making it easier for a beginner to make this on veroboard. The original circuit I got from it`s datasheet. A little modified circuit below, This can be operated with single supply line, but that topology gives....
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A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as light emitting diodes, timers and flip-flops. The monostable multivibrator will create a condition: in which one of the states is stabl....
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On the amplifier circuit using ic STK, the same as my previous posting. However, in the above circuit has 2 inputs and 2 outputs, or commonly called a stereo amplifier. This issue of power amplifier 2 x 18Watt and has impedance 8. To stress that it takes....
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Why are four legs connected to the green LED and two to the amber LED in the 4017 traffic light circuit Shouldn`t it be able to do with only one leg per LED Each output is consecutively active for the same time. By wired-OR-ing outputs you can create longer....