Free electronic circuit design and schematic diagram
This schematic diagram shows a ring-around LED flasher circuit. This circuit will turn off two LEDs and turn on the other two until the timing cycle reverses. This circuit can be configured to flash four LEDs in sequential order by pressing and holding S1 closed until only one of the LEDs is on then releasing it. Here is the schematic […]
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This is Discrete Running LEDs circuit. This circuit gives a chasing pattern like the running LEDs display in video shops. Here is the schematic diagram of the circuit: When the power is applied to this circuit, all transistors will try to come on at the same time. However, some will get a different turn-on current because of the exact value […]
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This circuit is line powered flasher, can be used in any application, and Christmas lamp is one of the example. Look at the circuit’s schematic diagram below: The control for triggering the SCR is done by Q1, Q2 and related resistors. The timing depends on R1,R2 & C1. To change flashing frequency don’t modify R1 and R2 values: set C1 […]
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