This circuit is the receiver for the previous transmitter modulated by an audio signal. The transducer is a ceramic capsule, in which case the circuit becomes ideal for telegraphic transmissions.
The 60 Hz hum or noise from the power grid (hum, in English) is one of the biggest enemies of...
The 4028 CMOS IC not only contains the complete decade counter, but also the 7-segment decoder...
This circuit was found in an Electronic Design from the 80's. It shows how to use a MOSFET driver with...