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| Cheap led christmas light flasher circuit is controlled by audio Posted: 22 Dec 2014 12:51 AM PST 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 Posted: 22 Dec 2014 12:25 AM PST 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. […]  |
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