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 Simple Crystal oscillator Circuit

Wednesday, December 17th, 2014

This is simple crystal oscillators that provided square wave of 1MHz to 10MHz, Use an inverter gate IC and control frequencies with crystal. A oscillator or a frequency generator provide waveform out in various forms. For example : sine wave, Triangular waveform, Or square wave. The Frequency generator to control or out for a base […]

 Many the 12V 1A power supplies circuits

Sunday, December 14th, 2014

Mr jafar need to use the 12 volts 1 amp DC Power Supplies. In my sites has many circuits related them. – Cheap and old but sure, use transistor and zener as main http://www.eleccircuit.com/simple-regulator-by-transistor-c1061/ http://www.eleccircuit.com/dc-power-supply-9-volt-using-tip31-transistor/ – Cheap and popular all times, use IC7812 http://www.eleccircuit.com/regulator-5v6v9v12v-1a-by-ic-7805780678097812/ Note: If you have a 1A normally circuit. So your 12V […]

 D/A converter circuit for motor controller

Saturday, December 13th, 2014

We control easily a motor to stop and rotate. If need to control it on linear feature is speed high-low difference so use this circuit. In Figure below, we use the 4 bit comparator circuit that output to the input of EXCLUSIVE-OR gate. Then, it is fed to the voltage divider circuit. Which is final […]

 1KHz Signal injector for electronic technicians

Tuesday, December 9th, 2014

A signal injector is important tools for the electronics technicians it small and cheap. This project is better the simple circuit because it has 1KHz and many frequency harmonic. The normal signal injector has a square wave output about 1KHz. Which the square wave has lot of harmonic and up to many MHz so can […]

 Constant current circuit using LED

Friday, December 5th, 2014

Normally the voltage drop across LED while forward bias will be about 1.2 to 1.4 volts depend on type of LED by has the temperature coefficient is -1.5 mV per degree Celsius. Which similar to the temperature coefficient of junction. between a base and emitter of silicon transistors. From this relationship can the constant current […]

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