Audio Cable Tester (CB3827E)

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

Gate dip Meter (CB21046E)
This circuit was found in a Popular Electronics from the 90's. It consists of the solid-state...
Power Grid Data Transmitter (CB4809E)
Radio Electronics published this circuit in a 90's edition. The circuit makes use of an uncommon...
Low Drift Amplifier LM34001 (CB15276E)
Other operational amplifiers from the same family such as MC34002, MC35001, MC34004 and MC35004 can...