Audio Cable Tester (CB3827E)

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

CMOS Oscillator with Active Cycle Adjustment (CB11333E)
With this circuit it is possible to adjust the active cycle of the generated signal in a wide...
Sensitive Touch Switch (CB488)
A touch in this circuit turns-on the lamp or the relay. Power supply is according the lamp or...
Direction & Speed Control (CB5370E)
This series motor control circuit was obtained from an old manual from the 80's. The SCRs must be...