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To provide rapid motor speed changes and motor direction reversal, four outputs drive a MOSFET H-bridge. N-channel devices are the lower rail power MOSFETs and P-channels are the upper MOSFETs. All of them are driven by the TC4469. A small series resistor....
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You can save on your electricity bills by switching to alternative sources of power. The photovoltaic module or solar panel described here is capable of delivering a power of 5 watts. At full sunlight, the solar panel outputs 16.5V. It can deliver a current....
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Make a Oscillator circuit with a Op Amp and an crystal (7. 68 MHz) Similar to the one in the schematic below, but for a 7. 68 MHz crystal. I have the crystal, various Capacitors, Resistors and a couple of Op Amps. But no digital Logic chips. "LM111 is not an....
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I have two ICM7555 CMOS 555 timers, and I was wondering if anyone has any good am radio transmitter circuits that incorporate two (or one!) 555 timers....
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Idea of this circuit came to me at midnight when my pet dog started barking continuously on sensing a moving shadow, perhaps that of an intruder. Dogs have a night adaptation capability to maximise the sensitivity of vision in low light. They are well....
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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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This web page presents details regarding the design of a strain gage based load cell that can be used, in conjunction with an electronic data acquisition (DAQ) system, for static thrust measurement of a rocket motor. The load cell described here is meant to....
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Tesla coils are air-core, resonant transformers. Working at high frequencies, they can generate tremendous voltages with spectacular lightning-like discharges. The most popular use for them has been in the film industry, where they are used whenever....
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Here is a simple circuit based on IC uA 741 that can be used to pickup voice from telephone lines without even contacting the line. If a high impedance magnetic core is placed near a telephone instrument or near one of the telephone wires, it picks up....
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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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A pair of multi-range timers offering periods of up to 24 hours and beyond. Both are essentially the same. The main difference is, that when the time runs out, Version 1 energizes the relay and Version 2 de-energizes it. The first uses less power while the....
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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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This low-cost function generator, based on the Maxim MAX038 high-frequency waveform generator, produces sine, triangle, and square waves from under 1 Hz to over 20 MHz..
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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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ESP Lighting Information Page - Dimmers, electronic transformers, etc. - how they work, what`s wrong with them and how it can be fixed....
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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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This negative oxygen ion generator circuit is composed of power supply steady voltage circuit, under voltage detection indication circuit, high frequency oscillator and high voltage generator circuit, it is shown in the figure 9-113. The power supply steady....
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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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Pulse size and width are independent of the pulse energy or other properties of the event. Geiger-Mueller tubes are less sensitive to non-gamma-ray radiation, and their dose-rate calibration accuracy is poor. They are widely used because they offer a good....
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Apart from the diode (which replacement would need a PbS, Lead Sulphyde, galena cristal) everything you can see in the circuit (for the no power version) can be built with enamel wire, alluminium cooking foil, carton wax and so on. The real painful part is....
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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...