This circuit was published in the July 1993 issue of Electronics Now magazine. It uses a sensor from the time and triggers a buzzer with a Sonalert-type oscillator.
We found this circuit in an old documentation. It has a thermally compensated voltage reference. The...
Suggested by a Popular Electronics, this small amplifier that has a detector to follow RF...
The presented circuit generates a pulse whose delay in relation to the input depends on RC. These...