We found this circuit that converts a direct voltage into a proportional frequency signal. The circuit is from an Electronics Now from April 1993. The JFET can be of any type.
This small Hartley oscillator uses an output transformer for transistors. The frequency is...
Circuits similar to this appear elsewhere in this section. The transistors can be BC549 (low...
The integrated circuit used in this 70's project is unusual, being the critical element of an...