This is a common oscillator configuration that generates rectangular signals in phase opposition. This circuit is from October 1986 Radio Electronics.
The gain of this alternating voltage amplifier is 100 times, depending on the 1M-ohm resistor, which...
This simple field strength meter is from a transistor book from the 60's. The transistor is made...
We found this circuit in an 80's Electronic Design. It makes use of couplers of the time that can...