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.
The coil consists of 100 turns of wire 28 in a wooden or PVC tube from 2 cm to 2.5 cm in diameter with...
This circuit using only transistors was found in documentation from 1977. The frequency is 4250...
This 48 V circuit with a capacity of up to 105 V was found in a 2005 Linear Technology manual. The...