This circuit from a 1967 documentation generates 2.5 Hz signals depending on the capacitors used, in this case 160 uF. For 4 6700 pF the signal will be 20 kHz.
The circuit presented generates pulses at regular intervals with the duration controlled by a...
Found in Electronics Now, this circuit generates signals for testing like a signal injector. The...
This simple expandable circuit was obtained from a Popular Electronics from the 80's. The supply...