Cheap Speaker Finder

Here is a circuit that will cost about 10 bucks and will help you find unknown speaker wires in a car.

It is an Audio Generator or otherwise known as an Audio Oscillator.

It just puts out a simple tone so you can find the speaker wires.

The Transistors I used were out of an old car stereo in the scrap pile and my cost was nothing.

You can use the same Circuit as a Continuity tester for wires and fuses, etc. by rearranging the wires.

Not if you use two 1.5 volt batteries instead of the 9 volt.

An amplified system will accept up to about 3 volts without dammage. But, the amp is not on when the hot lead or remote is not connected. You can use a capacitor of 1uF on the output as isolation if you are really concerned with this.