This frequency shift modulation circuit was found in the November 1994 issue of Electronics Now magazine. The circuit operates at low frequencies.
Found in Popular Electronics from the 90s, this signal tracer or tracer can be used with the inner...
In the circuit of the figure we used a potentiometer of 1 k ohm. We can use a larger...
This circuit was found in a 1966’s Delco Radio documentation. Transistors are from the era, high...