This circuit is from a Mallory 1968’s documentation. The integrated circuit is of the time and the transistor admits equivalents.
Found in Elementary Electronics from 1970, this circuit is a toy for generating different types of sound...
To obtain rectangular 1 kHz signals, we can have a simpler configuration, with a single amplifier, as...
We found this circuit in a 1977 National Semiconductor technical documentation. The circuit has 4...