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Many enthusiasts will be using their PCs as data loggers, controllers or as web servers. ln these cases it is important that the machine is kept powered up for as great a fraction of the time as possible, even if there has been a power cut or if the power....
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Taking the wiring going to the external amp, in the 15 pin connector you will want pins 8 and 9. I believe they are brown/white and dark green/white looking at the thread in the link you posted. Circuits 367 and 368. Then I clipped and stripped the....
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Because the recent events in Fukushima, Japan, brought a lot of concern on radiation levels, by popular demand, here is a simple Geiger Muller counter using the Russian tube SI-22G and a single transistor regulated inverter that puts out 400V, as required.....
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This inverter will drive any fluorescent lamp between 8w and 20w but works best with 16w tubes. It preheats the electrodes and keeps them heated while....
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Nothing in this project is real original, but I did do a couple of modifications from the circuits I saw. The fellow that started this, as far as I can tell is Jack Bryant, KE4ID with his one tube superhet contest radio project. That was my basis for this....
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A calculating resonance capacity from formula (1) and NFC Tag LSI are set to antenna circuit board, and measured resonance frequency, after that, adjusting resonance capacity..
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RCA made some of the first commercially available CCD chips. A CCD (Charge Couple Device) is a silicon solid state imaging device that replaces the vidicon tubes of the past. CCD`s are made up a two dimensional array of photo detectors coupled to an array of....
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Distance markers and iff signals are inserted at separate grids on one tube, while radar video from input 3 is impressed on control grid of other pentode. -NBS, "Handbook Preferred Circuits Navy Aeronautical Electronic Equipment, " Vol. l, Electron Tube....
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In this circuit a LM339 quad voltage comparator is used to generate a time delay and control a high current output at low voltage. Approximatey 5 amps of current can be obtained using a couple fresh alkaline D batteries. Three of the comparators are wired in....
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When the 36 kHz infrared light from the LEDs is reflected by an object, one of the receiver modules will be triggered, and the PIC16F84 µController will steer the ROBOT away from the objects by reversing one of the motors...
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The type C system was first installed about 1925 and has been very extensively used. It incorporates the most desirable features of the systems just considered. Like the type A system, the carrier is suppressed, and hence the effect of line attenuation is....
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With the inspiration from lab 3, Digital Waveform Synthesis, I want to make a project that can process and playback music. Some songs are pre-stored in memory. They can be played back just like a real piano keyboard. Also the user can input a song on a....
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It`s a classic designing of final amplifier 35 W, with two EL34 in push-pull, from the Siemens and Halske, with year of designing 24/3/1953 and code SV410/1. The amplifier it worked from 1954 until 1989, whenever it came also out except operation, with mean....
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This LED Flasher circuit is based on the 555 timer IC. The LED Flasher circuit diagram is very simple and require few external components. When the circuit is working the red LEDs will flash at a set frequency one by one like at the railway crossing indicator...
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the decision of designing a 9V powered Headphone Amplifier was finally taken. The main requirement was to power the circuit by means of a common, PP3 (transistor radio) alkaline battery. The appearance of the 5534 low-noise op-amp at a reasonable price was....
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This single white-LED torch can be housed in an empty glue-stick tube and has a long rechargeable-battery life....
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This TDA2030 35 watt audio amplifier circuit project is designed to provide an output power of 35 watts on to a 8 ohms load. The TDA2030 is a monolithic IC in Pentawatt package intended for use as low frequency class AB amplifier. The TDA2030 provides high....
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A phase shift oscillator, using a CE Amplifier. I have a Vc of approximately 6V, gain of approximately 40(>29, as required). I aim for an oscillation frequency of 1. 5 kHz...
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This circuit made from an infrared phototransistor and infrared LED. This transducer works with the principle of light reflection, in this case the light is infrared. The skin is used as a reflective surface for infrared light. The density of blood in the....
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Build a digital multimeter that can measure dc/ac voltages up to 100V and dc/ac currents up to 1A. The circuit will be powered by 9v battery. I have decided to use the voltmeter from and modify it according to my needs. The problem is that after implementing....
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Interferometer is best used in calculating the index of refraction of gasses and transparent matter (i. e. air and glass). Doing so requires counting each interference circle one by one. As a matter of fact, getting a precise measurement requires counting up....
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In 2011, designing a frequency converter circuit consists in most cases of picking out an IC that has the characteristics you need from a gain and mixer spurious product standpoint, add a couple filters, and a power supply. In many cases the oscillator is....
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Here is the circuit diagram of an ultrasonic mosquito repeller. The circuit is based on the theory that insects like mosquito can be repelled by using sound frequencies in the ultrasonic (above 20KHz) range. The circuit is nothing but a PLL IC CMOS 4047....
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This circuit is half dozen Band Graphic Equaliser, you can modify sound in low, mid and high that circuit used IC 741 Op-Amp. With this circuit you can management and mix frequencies and tones as desired. The audiblefrequency spectrum is roofed in six steps:....
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Looking for resistor value and capacitor value for low pass filter to remove RF. The application is removing undesired untuned RF from the crystal set ....
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The easy way to measure high AC currents is to use a clamp meter but these are generally quite expensive and cost several hundred dollars at a minimum. Add-on clampmeter adaptors can work well but they only work with digital multimeters which have millivolt....
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The circuit described here requires no physical contact for operating the appliance. You just need to move your hand between the infrared LED (IR LED1) and the photo transistor (T1). The infrared rays transmitted by IR LED1 is detected by the photo....
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With the aggravation and improvement of human environmental consciousness day by day of the energy crisis, the development and utilization of new energy is paid attention to more and more by people. And the solar energy has been favored by people recently as....
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So there I was, ripping out a solo during a practice on my ""new"" Hammond C2 organ and the sound falls away and gets soft to the point of no....
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There are only four components required, and the cost for these is around 70p, so it would be a good candidate for a classroom exercise. Even a cheap relay like the Omron G5LA-1 5DC can switch loads of 10A at 240V. A word of caution: don`t tinker with mains....
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You can use any LED you want for D1 - D10, however blue LEDs have a higher voltage requirement so if you want to go blue for a modern look, they may appear more dim then red, yellow or green. By leaving pin 9 of U2 disconnected, the graph will operate in dot....
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The BA1451F is a Tuner system IC for electronic tuning for AM Radios FM IF, and MPX. It has been developed for HiFi component applications. The MPX VCO circuit requires no adjustment, which will enable a reduction in the number of production line processes.....