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I designed and built this Ring Counter Clock in 1970. The base is a 12" diameter/2" thick block of walnut from a hollowed-out gun stock blank. The back side of the base has been hollowed out to hold the circuit board. I chucked it up in a large lath and....
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The following circuit shows about Photovoltaic Light Sensors In Solar Tracker. Features: accurate, low cost, simple, single axis electronic solar ....
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This wide-range light dimmer circuit uses a unijunction transistor and a pulse transformer to provide phase control for the TRIAC. The circuit operates from a 115 volt, 60 Hz source and can control up to 800 watts of power to incandescent tights. The power....
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Convert a feedforeward opamp PID loop to C code I am trying to do such a conversion and honestly, have no idea where to start. I can get all input values through an ADC, voltage, current, whatever, but coding a feedforeward PID is a little new to me. Any....
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Frequency shifting keying technique is used to transmit binary data. The circuit diagram with description fsk demodulator used 565 IC for frequency shift keying...
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One type of metal detector is a type of beat frequency oscillator (BFO). The methods used in metal detectors in general are changing the characteristics of the oscillator when there are close to the metal sensor. The detector works based on the resonant....
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This small transmitter uses a hartley type oscillator. Normally the capacitor in the tank circuit would connect at the base of the transistor, but at VHF the base emitter capacitance of the transistor acts as a short circuit, so in effect, it still is. The....
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This circuit gives sound handful that modifies interestedly, occurrence sound rate cricket Fixed. By R3 should experience change the value C1,R5 and C2....
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A digital clock is one that displays time in digital format. The circuit described here shows the time with double-digit "minutes" and two digits `seconds` in four seven segment displays. The segment of seven switches are interconnected with 8051....
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This simple diode modulator delivers excellent results when used for high percentage modulation at low signal levels. Constants are shown for a carrier frequency of about 10 MHz, but, with a suitable tank, the circuit will give good results at any frequency....
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In many discussions of LPAM transmitter design you will hear or read references to "the Wenzel circuit" or "the Wenzel transmitter. " These refer to the clever transmitter design downloadable at During the mid 1990s and early 2000s, this was the best....
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Ground loop offset errors and ground noise are removed by a differential amplifier or instrumentation amplifier prior to A/D analog to digital conversion. The differential input amplifier mitigates ground loop errors. Precision measurement of non-isolated....
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The circuit diagram of this programmable sequencer could be applied in a number of timing uses. Prior to the start of each interval, an audible tone is generated, and a seven-segment LED display shows the interval number. Prior to the end of that inerval,....
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The power amplifier circuit using MOSFET has been very popular, because the sound is very aggressive, as compared to transistors and ICs. It can be low-frequency and high-frequency response as well, it is highly durable. Usually, if compared with the same....
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The second circuit simulates the siren of an American police car. It uses two 555 timers in the circuit. The 555 on the right is wired as an alarm tone generator and the second 555 timer on the left is wired as a low frequency astable timer which generates a....
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Model Railroader is the world`s largest magazine on model trains and model railroad layouts. We feature beginner and advanced help on all model railroading scales, including layout track plans, model railroad product reviews, model train news, and model....
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The schematic is very similar to the one seen in the CPLD Development Board Tutorial because it`s basically the same board with a tiny addition. The new part of the schematic is in the lower right corner. 8 (DIP) Switches, a resistor array & some additional....
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In most countries it is now mandatory or at least recommended to have a rear fog light on a trailer with the additional requirement that, when the trailer is coupled to the car, the rear fog light of the towing car has to be off. The circuit shown here is....
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A simple op amp and silicon diode are the heart of the temperature-to-voltage converter that will permit you to use an ordinary voltmeter-either analog or digital-to measure temperature. User adjustments make it possible for a reading of either 10 mV or 100....
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This fan regulator circuit will automatically control the speed of your fan according to the temperature. Two thermistors (R1 and R2) are used to sense the temperature. The circuit works almost like the published here previously. Here the potentiometer is....
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Just ran a +12V switched wire back to the camera wiring and connected it to the same place that the reverse lights connect. That way, either the reverse lights or my switch can enable the camera. The important thing here is the use of diodes! These are used....
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This is how I designed a simple circuit that allows you to control a servo and put it through its paces....
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The SLA battery is charged from the vehicle s battery. When the engine is running, the voltage remains fairly constant, which greatly simplifies the charging circuit. If the SLA battery is fully charged, any further charging current from the vehicle battery....
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Designs for audio amplifiers with DC coupling to the load are not often encountered these days, even though they offer definite advantages....
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The circuit you are about to see is the culmination of some effort at improving the basic Link intercom design. You may think that pulse dialing is `old hat` nowadays, but the exercise of building and testing the Link `P` in this format, and understanding....
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The 8-lead plastic mini-DIP LM3909 IC was developed by National Semiconductor in the mid `seventies of the past century. It was a monolithic oscillator specifically designed to flash Light Emitting Diodes. By using the timing capacitor for voltage boost, it....
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A simple transistor amplifier circuit diagram and schematic which can be used as a 12 watts audio transistor amplifier.An op amp IC is used to produce the gain required....
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The 555 will activate a relay. When pins 2 and 6 are connected as an input, the chip requires only about 1uA to activate the output. This is equivalent to a gain of about 200, 000, 000 (200 million) and represents about 4 stages of amplification via....