touch activated LED circuit

Thread Starter

Green Bean

Joined Mar 31, 2017
126
Hello. I am looking for a simple way to light an LED by just touching a wire. I know that you can connect the anode to + and touch the cathode but the resistance of the body between the cathode and ground is too great to light the LED very brightly (just using a couple batteries). You can increase the current, but I don't want to get electrocuted. Couldn't I somehow use a transistor as a switch to do this?
 

AlbertHall

Joined Jun 4, 2014
8,381
Google "led touch switch circuit" will find numerous examples. I like the one below but replace the lamp bulb with and LED and series resistor. This circuit draws no current when the light is off bar the transistor leakage.
 
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