This circuit was found in an ancient American documentation. The power supply is not given, but we have the voltages used. The relay is sensitive type for high voltage.
Other operational amplifiers of the same family can be used in this circuit suggested by Motorola in...
This transmitter for the FM band was found in a 1993 spy documentation. The coil consists of 2 + 4...
The purpose of this regulator is to regulate the RMS voltage in an alternating current load. The...