This circuit can be used as an answering password system in a store, office, or other location. The circuit is from Intersil using components of the time. The circuit is from the 80's.
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...
This circuit converts the 12 to 13.6 V of a battery into 6 Vwith current up to 1 A. We can use it...
We found this conventional version of a single-transistor oscillator in the January 1996 issue of...