The capacitor used in this circuit can have values between 5 and 30 uF. The circuit is of old documentation for radio amateurs. Observe the special source used in the supply.
This simple tester was found in a Popular Electronics from the 90s. The circuit is powered by two 9 V...
This circuit was found in a PC documentation from 1996. It can be used as a shield with modern...
This limit alarm was found in a 1980s US documentation. Comparators can be equivalent and the...