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.
This LC oscillator with complementary transistors was found in an English publication from the...
This circuit generates two signals in phase opposition. The frequency is determined by R1 and C1...
We found this circuit in an old documentation from the 80's. The integrated circuit used is an...