This is a field strength meter found in an 80's Hands On. The circuit operates at frequencies up to 500 MHz and has a buzzer as its indicator. Can be used as a detector for spy transmitters.
We found this power supply in the 1982 SGS Linear Integrated Circuits manual. The L296 is not...
This circuit is from an English book from the 1980s. Transistors can be general-purpose types of...
The basis of this circuit is the integrated TA7205, which is not very common today. We found the...