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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FM Booster (CB26081E)
We found this circuit in the December 1998 issue of Electronics Now magazine. RF transistors such...
Temperature to frequency converter (CB9611E)
This circuit was found in an American documentation from the 80's. The sensor is a special...
Automatic Lighting Control (CB17427E)
This circuit automatically controls the degree of illumination. As the circuit is from 2001, it...