This circuit is from a Fairchild digital clock module shown in the March 1977 issue of Radio Electronics magazine. The circuit required a few external elements, including a common transformer.
For an operation with extremely low consumption, generating an audio tone, we can use the circuit of...
Using a 741 operational this circuit was found in the August 1993 Electronics Now magazine. The...
This circuit measures the RF power of oscillators and small transmitters in the range of 0.05 to...