Micro Spy (CB21872E)

Assembled with SMD components this circuit can be very small. The range is a few tens of meters. We found an Australian documentation from 1991.

Driver for Shift Register (CB20750E)
This circuit was found in documentation two years 80. Transistors can be modern equivalents. Or...
2 meters preamplifier (CB20257E)
This circuit, very critical due to the frequency at which it operates, was found in an American...
Amplifier TDA2002 (CB11611E)
This stereo circuit with the 2002 integrated circuit. The power is 6 W per channel with 16 V of...