Circuit Assembly

Now that you have all of the parts and tools together, you can begin construction. This is where you will need to solder. If you do not know how to yet, I recommend find some information on the web about it and then practicing with old parts out of the appliance you salvaged from. Maybe try soldering a few wires together.


  • Must collect all of the necessary parts
  • Must posess rudimentary soldering skills (its not hard, there are lots of guides online to get you started)
  • Tools:
    • Wire strippers (knife or scissors will do)
    • Wire cutters (knife or scissors will do)
    • Soldering Iron
    • Solder


  1. Place the IC sockets into position on the circuit board
  2. Solder the sockets into place.
  3. Check that there are no solder bridges connecting neighboring pins
    note: the pins are close and the bridges can be small. Unwanted solder bridges could cause hard to detect problems later on)
  4. Insert all of the resistors onto the circuit board
  5. Solder all of the resistors into place
  6. Insert capacitors into place
  7. Solder capacitors into place
  8. Solder wires connecting to external components (potentiometer, power supply, LEDs and shunt)
  9. Go over the circuit board one last time and make sure that all pins are soldered and that there is no extra solder. Remove any excess solder that is making connections that shouldn't be there.
  10. Place ICs into their sockets.
  11. note: If you make an error and would like to solder on the circuit board again, remove the ICs so they are not damaged. Soldering near an IC could cause them to be destroyed

At this point you should have a circuit board full of soldered parts. There should be 6 wires hanging from the board.

Next Steps
You are now ready to finish making the last connections and put the entire thing into the jar. Continue on with the enclosure