This circuit that imitates the sound of the cowboys' calls with their “louder” was found in a Hands On Electronics from the 80's. The integrated circuits used are from that time.
This circuits shows how to use in operational amplifier as a basic voltmeter. Power supply must be...
The coils determine the frequency of this oscillator that we found in the January 1996 issue of...
This circuit was found in a National Semiconductor Handbook from the 1990s. The integrated circuit...