This circuit was found in the November 1966 issue of Electronics Now magazine. It uses an LDR as a sensor and has a Bargraph scale with the well-known LM3914.
In the figure we have a bistable multivibrator using an operational one. The circuit is from old...
This silencer or squelch preamp circuit was found in a documentation for radio amateurs. It...
We found this circuit in an American documentation from the 90s. Through an LED it indicates the...