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110 and 220V AC LED Voltage Indicator Circuit Diagram. Useful for power lines control, Simple, transformer less circuitry. This circuit, designed on request, has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an increase in ac or dc supply voltage needs to be detected. D3 illuminates when the line voltage is approaching 120V and will remain in the on state also at 240V supply. On the other hand, D6 will illuminate only when the line voltage is about 240V and will stay on because the latching action of Q1, Q2 and related components. C1, D1 and D2 provide a low dc voltage in the 4.5V - 6V range in order to allow proper operation of latch circuit and LEDs. Circuit diagram: 110 and 220V AC LED Voltage Indicator Circuit Diagram Parts: R1__________470R 1/2W Resistor R2__________220K 1/4W Resistor R3,R7_______470R 1/4W Resistors R4__________1K 1/4W Resistor R5________...

110 and 220V AC LED Voltage Indicator Circuit Diagram. Useful for power lines control, Simple, transformer less circuitry. This circuit, designed on request, has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, mainly when an increase in ac or dc supply voltage needs to be detected. D3 illuminates when the line voltage is approaching 120V and will remain in the on state also at 240V supply. On the other hand, D6 will illuminate only when the line voltage is about 240V and will stay on because the latching action of Q1, Q2 and related components. C1, D1 and D2 provide a low dc voltage in the 4.5V - 6V range in order to allow proper operation of latch circuit and LEDs. 110 and 220V AC LED Voltage Indicator Circuit diagram: 110 and 220V AC LED Voltage Indicator Circuit Diagram Parts: R1__________470R 1/2W Resistor R2__________220K 1/4W Resistor R3,R7_______470R 1/4W Resistors R...