We found this circuit in a 1957 Raytheon transistor publication. The circuit can be assembled with more modern transistors with minor changes. The handset must be high impedance magnetic.
Using the ICM7556, dual CMOS version of the 555, this circuit generates triangular signals from 1 to...
We found this circuit in an English magazine from 1976. The magazine no longer exists, but just...
This circuit was obtained from an English magazine from 1977. The magazine no longer exists, but...