This project shows how to make a box for old variable resistors.

You can use old variable resistors from old appliance for the following applications:

Tools:

- voltage reference,

- finding a resistor value for transistor biasing,

- substitute to a real resistor if you do not have one in stock,

- using voltmeter to measure resistance value of resistors.

Devices (variable resistors alone):

- low current power supply.

- cheap light dimmer with bright LED.

Devices:

- offset trimmer circuits for instrumentation amplifiers,

- voltage sources or current source output control,

- filter or voltage controller filter (VCF) frequency control,

- amplifier or voltage controlled amplifier (VCA) control,

- oscillator or voltage controller oscillator (VCO) frequency control.

This is the device that I made many years ago:

Step 1: Attach the Variable Resistors

I used an electric drill to drill the holes:

I soldered the wire to variable resistors with a soldering iron. I made a knot just before inserting the wire into box holes so that is does not disconnect from variable resistor contacts if someone pulls it.

Step 2: Make the Box

i made a box from old transmission wire encasement/boxes/pipes:

I used screws to attach the separate parts of the box.

This could be a good idea if you need a box for an old electronic circuit that you made.