In fact, this 1967 Electronic Design circuit generates two symmetrical ramps whose frequency depends on the values of the components used. Modern equivalent transistors can be used.
Indicated for applications in the analysis of logic circuits, this circuit was found in 90s Radio...
This circuit is from 1977 documentation, and high current equivalent transistor must be used. The...
Found in an Electronic Design, this circuit makes use of general-purpose bipolar transistors. The circuit...