We found this circuit in the November 1992 issue of Radio Electronics magazine. The circuit has two integrated circuits, one of which is a preamplifier stage. The power supply must be dual.
This circuit for medium and short wave range was found in an American documentation from 1992. The...
This circuit consists of an inverter powered by only 4.5 V. The circuit is from a 1967 Mullard...
This amplifier for hearing aid was found in a 1968 documentation using an integrated of the time....