Ammeter (CB9660E)

This current meter with many scales was found in a 80s American documentation. The operational amplifier is from that time, uncommon nowadays.

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Stereo Multiplexer (CB17374E)
This circuit encodes the two channel signals from an amplifier for a multiplex-stereo...
4 transistor receiver (CB22276E)
This radio for the medium wave band was found in an old American documentation. The transistors are made...
Locked Alarm (CB4800E)
This lock-up alarm circuit was found in a 1990s Radio Electronics magazine. The sensors are...