We found this circuit in a 1966 US documentation. It simulates a variable capacitor that can vary capacitance from 1,000 to 1. Transistors are general purpose types.
This circuit has start and reset switches and can generate signals at long intervals determined by the...
This very low frequency circuit was found in a 1964 Electronic Design. Transistors may be modern...
Suggested by Linear Technology, this 80's circuit makes use of an operational of the time but can...