Audio Cable Tester (CB3827E)

This simple circuit tests both monophonic and other two-wire audio cables. The circuit is powered by two common batteries.

Capacitive Discharge Ignition (CB12639E)
The critical component of this circuit is the transformer. T1 and T2 can be BD135 and T3 / T4 can...
Live sound (CB9234E)
Found in Popular Electronics from the 90s, this circuit can employ other low power audio...
Fluorescent SCR Inverter (CB12328E)
This circuit is from a 1967 publication. It is possible to power a fluorescent lamp from a 12 V...