This is a circuit suggested by Linear Technology in a 1980s documentation. The integrated circuit is from the era. Observe the input and output voltage.
The Single-Chip MCP19122/3 Solution Offers Industry-Leading Flexibility A new Digitally Enhanced...
The great advantage of the circuit shown in the figure is that its frequency is controlled by a...
The sensor in this circuit is a BA315 diode. Other diodes can be experimented, but this is one...