This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V and other frequencies can be generated with capacitor replacement.
We found this simple toy organ circuit in the February 1968 issue of Radio Electronics magazine. The...
In the figure we have a practical circuit for use with a magnetic transducer. The 20 M ohms...
This circuit was found in a Motorola documentation from the 70s. The components are from the time,...