Found in a 1968 American documentation, this circuit uses an operational amplifier that is uncommon today. The feed must be symmetrical. The gain is 40 dB.
This circuit functions as a thermostat triggering a relay when the boil control temperature...
This 1 MHz oscillator was found in the February 1992 issue of Radio Electronics magazine. The...
In this circuit we have the voltage multiplied by 5, obtaining between 50 and 80 V output when the...