This circuit triggers a warning if there is a need to interrupt a process. The circuit has a 1 second delay. The circuit is from old American documentation.
In this circuit we show how to modulate the pulses produced by a 555 in frequency. The circuit can be...
This toy organ was found in Popular Electronics from January 1967. It can be constructed from...
This elaborate electric fence design differs from the others by triggering an alarm in the event of...