A Simple Three-Component Low Voltage DC Touch Switch

A Simple Three-Component Low Voltage DC Touch Switch
In this video we take advantage of the MOSFET's insulated gate to create a very simple touch switch that is suitable for low voltage DC applications. It can control higher voltage DC and even AC through the use of a relay.
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[@Mike.Kachar]

This was a GREAT little demo of this simplistic touch circuit - I loved it!! ♥️
Thanks for sharing AND teaching us!!

[@learnelectronics]

Glad you enjoyed it!

[@bens4446]

cool! looks like a nice way to simplify led circuit switches.

[@paulperano9236]

It also highlights why you often put a 10k resistor from the Gate to ground.

[@waynegram8907]

Make a video lesson about the differences between using Depletion VS Enhancement for FETS, when would you a circuit want to use Depletion and when would a circuit use Enhancement?

[@natec.2346]

I am definitely including this in some upcoming builds! Thank you for the explanation!

[@frankowalker4662]

Instead of the LED you could have it swiching a transistor that switches a relay.

[@ericsmith7988]

You could very easily use this to turn on a high voltage circuit. Use an opti coupler to isolate and a relay for high voltage. Maybe a lamp.

[@rv10flyer84]

For high power loads, 10-20mA will energize a 40-100A solid state relay (SSR).

[@weerobot]

Cool...

[@warrenking1815]

Neat !

[@tnamen1307]

Please make new video of a DELAY ON TIMER circuit using bc547...
ON time should be delayed for 30 seconds.

[@katesmiles4208]

👍❤

[@NemencioRas]

What's the minimum VCC voltage required for this circuit to work?

[@learnelectronics]

I did it on 5vdc. You might get it to work on 3.3vdc, but it's not enough to fully open the gate. Really, 5vdc isn't either, needs about 9vdc if you want full current flow on the MOSFET.

[@lasersbee]

The switching is not Stable as wired