This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V batteries since it requires a symmetrical source.
This circuit can be used with motors or resistive loads, such as heaters and incandescent lamps....
The output of this circuit can be coupled to a radio control transmitter to perform a...
Using an RCA integrated circuit, this instrumentation amplifier was found in a November 1970 Radio...