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 70 kHz oscillator is used to erase tapes in pre-recording. The circuit is from 1968 General...
We found this circuit in an old documentation for hams. In it we have the way to use a varicap to...
This sensitive touch circuit that triggers an oscillator uses only transistors. The circuit is...