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I have a led strip with a wonderful no touch dimmer on the bottom of the kitchen cabinets. What i would like to do is to "link" the inner lighting of the cabinets to the same switch, in a manner that when the dimmer is turned on, the cabinet lighting is also turned on, but without any dimming.

My first thought was to add a relay in serial to the dimmer, which would turn on the strip directly from the power supply. But the dimmer adjusts the voltage between 7 and 12V. Therefore the voltage would kill a 5v relay, and the 12V relay would only work on Max dimmer brightness.

My question is, is there a good way of making this work (haven't found relays that work with multiple DC trigger voltages), without adding an additional switch.

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Why don't you use a transistor to control the relay instead of directly controlling the relay?

Transistors can handle enough volts if you chose the right one. The transistor output will give 12V (or 5V if you put a DC/DC converter in between the power and transistor), which controls the relay.

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