Audio Cable Tester (CB3827E)

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

Mini amplifier (CB21697E)
The indicated fraction watt amplifier has good gain, requiring only 100 mV input for full power...
CW Shortwave Micro Transmitter (CB3999E)
This microtransmitter operates at a frequency between 3.5 MHz and 10 MHz determined by the...
Class A 10 W Amplifier (CB13678E)
The output transistors can be the TIP41 and the BD135 and BD136 drivers. TR1 can be a BC558 and...