This circuit switches on an external load after a certain interval given by the capacitor. The circuit is from a documentation from the 80s. The load depends on the relay used.
This simple circuit controls the brightness of an LED from LDRs, NTCs, PTCs or other resistive sensors....
This remote listening device was found in documentation from the 50's. The transistors used are...
This circuit came out in a Modern Electronics from June 1990. In it we have a low frequency...