Found in an EDN from the 90s, this regulator makes use of the integrated circuit of the time. The input can be from 8 to 20 V.
An audio amplifier of good power, and great sensitivity; a simple tuning step and a detecting...
Using an operational amplifier with FET, this voltmeter has a high input resistance. The circuit has...
Found in the 1976 Siemens transistors manual, this circuit works with AM or FM IF signals. In the...