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Created September 13, 2020
Last modified September 13, 2020
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Summary

If I understand correctly, you want to control both lights as follows:
The 230VAC Bulb is on when Mains power is present, and the 12VDC Bulb comes on when Mains power is lost. Moreover, you want to control turning on/off both lamps with one switch.

https://www.circuitlab.com/circuit/j8bu8xbaejcj/ac-dcbulb-solution/


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