Have you ever wondered if you could use a wee little momentary tact switch to turn large high voltage high current things on and off? Wonder no more!! Use this instructable and the circuit schematic to build yourself a latching circuit!
Step 1: Watch the Video
First things first, watch the video and see how I built the circuit. The video is all encompassing, but further on in this instructable you will find some more detailed instructions and some tutorial videos.
Step 2: Gather Supplies
For this circuit you will need:
1 N-Channel FET
1 PNP Transistor
1 330nF Electrolytic Capacitor
1 Silicon Diode
3 10k Resistors
1 100k Resistor
1 1M Resistor
1 Push Switch
Step 3: Learn to Breadboard (optional)
If you don't know how to use a breadboard, watch this video tutorial.
Step 4: Prototype the Circuit on the Breadboard and Test
Start by using the schematic above to prototype the circuit on a breadboard and test it. If it doesn't work, check your connections!
Step 5: Transfer the Circuit to Perfboard
Once you have built and tested the circuit on a breadboard, proceed to transfer the circuit to a perfboard. Perfboards are basically a bunch of holes with circular copper pads on each hole. Transfer the circuit, following your breadboard and the schematic. Don't forget to solder everything up!
Step 6: Done!
Congratulations, you're done! You can use this new circuit in conjunction with a relay to control high voltage high current loads using a very small switch! Each time you push the switch, the circuit changes state. Push once to turn everything on and hold it there and again to turn it all off.
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