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 circuit was found in a Popular Electronics from the 90s. The circuit uses TTL technology and...
The open output voltage on this circuit is approximately three times the peak value of the input...
The circuit shown in the figure is indicated for alternative energy sources, such as those...