Using a common crystal diode and a 741, this circuit can be used to detect microwaves. The circuit is from old documentation and the switch selects the gains.
The presented circuit generates signals in a 1:10 frequency range depending on the Ct capacitor. See the...
This circuit is from the 1977 RCA CMOS Integrated Circuit from the RCA of 1977. The power supply of...
The resistors R1 and R2 consist of 8 220 ohms x 2 W resistors connected in parallel. The...