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Forgive me for the simple question!

  • How would I create a circuit for a light that is switched on when another light is switched on?
  • Basically I want to use a more powerful source for a new light that is activated by another light with a smaller source. Something simple that I might be able to solder up.

I'm making a pinball game light modification and I want to grab the signal off of one of the interactive lights, but a more powerful source for a bigger light.

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  • \$\begingroup\$ Get a DMM and measure the voltage \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Feb 20 '19 at 3:22
  • \$\begingroup\$ You can do this yes, probably with a photoresistor to detect light, a transistor to switch the light on and off based on the current through the photoresistor, and some resistors to tweak things. \$\endgroup\$ – user253751 Feb 20 '19 at 5:05
  • \$\begingroup\$ @immibis I'm looking into a voltage controlled switch possibly? If I have access to the voltage powering the "signal" light - is there some way I could have the mod light circuit shorted until current comes through the signal wire? \$\endgroup\$ – denbjornen505 Feb 20 '19 at 17:08
  • \$\begingroup\$ yes, you can feed the signal to a logic-level mosfet to turn it on and thus use it as a low-side switch. It won't draw much of anything away from the light. \$\endgroup\$ – dandavis Feb 20 '19 at 21:02
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Ok, I ended up using a N24401 transistor as a switch. Here is the schematic of the circuit that I used!

enter image description here

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