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 simple indicator circuit was found in a documentation from the 90s. Trimpots can have values...
Originally in the 1992 publication, this amplifier was recommended for use with record players....
This small transmitter can send its signals to a receiver placed at distances up to 100 m. The...