LED display ac line indicator circuit


LED display ac line indicator circuit

This circuit is compatible with the main power is 115 Vac or 230 Vac.It shows that the power grid or not.And while the switch will still hold the power or not.
Operation of the circuit. be This circuit is the main indicator of power while not pressing the switch S1. Will have current flowing through R1, D1,LED1 will light up to reflect the input of the power is. But when the press switch S1 will flow through R2, D2,LED2. It makes LED2 light and also a part of current flow to trigger B pin of Q1. It makes Q1 work as a short LED1 to ground. Makes LED1 off.


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