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 is the typical circuit of an FET amplifier stage in the common source configuration. The circuit is...
This voltage-controlled oscillator was found on an Elektor from the 90s. The components are from...
We found this circuit in an English publication from 1980. It provides a logical output signal when...