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.
Found in a Maxim publication from the 90s, this circuit generates signals from 10 to 25 kHz with a...
We found this oscillator in a documentation for radio amateurs from the 1970s. The circuit can use...
This circuit is a manual of 1972 RCA power transistors. The critical components of the project are...