This circuit with the LM741 operational amplifier can be applied to other operational amplifiers. We found it in the September 1989 Radio Electronics magazine.
This transmitter for the FM band was found in a 1993 spy documentation. The coil consists of 2 + 4...
The circuit in the figure uses two of the 4001's four gates to trigger a relay in a timed manner. The...
This circuit was obtained in an old documentation for radio amateurs. The circuit is a sound...