This circuit works with the previous two by demodulating the signals received modulated in FM. The circuit is from the Radio Electronics magazine of December 1992.
Depending on the value of C1, this oscillator can produce signals of up to 1 MHz. For a capacitor of 10...
This circuit has a correction or linearity adjustment. We found it in Ferranti's transistor manual...
The oscillator shown in the figure emits sound when or another input is taken to a high level and...