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 Cheap led christmas light flasher circuit is controlled by audio

Monday, December 22nd, 2014

This project is designed to meet the needs of create particular project. In order to get the Christmas and New Year. I suggest the project get to the upcoming festival. This project is an LED chaser that is controlled by the voice signal. This principle the led run is not fixed or not of course, […]

 The transistor lat as SCR trigger

Monday, December 22nd, 2014

This circuit works similar to a SCR. When the trigger input is high, Both transistors Q2(PNP transistors) and Q1(PNP transistor) will work. Therefore, a current flow to the base pin of Q2, it has voltage 0.7 volts at resistor R1. When cutting the activation voltage, the transistors can continue to perform, because the base current. […]

 Current-controlled Sawtooth Generator Circuit

Friday, December 19th, 2014

This Sawtooth wave generator circuit include of the frequency oscillator is controlled by current. Which can generate the sweep frequency in wide range. Suitable to be applied in the field of music equipment and a narrow pulse output. Also we are able to be a random circuit, and Hold. This circuit include of current variable […]

 Low-volts Crystal Frequency Generator Circuit

Thursday, December 18th, 2014

We can easily use FET and Crystal to generate the frequency and In particular, this circuit use very low voltage. It can operate at a supply voltage to 1.5 volts only and at crystal frequency 100 KHz to 10 MHz. The crystal is connected to between the drain and gate of FET-T1 BF256. It runs […]

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