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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Residential Alarm (CB16909E)
This 1995 circuit uses interruption sensors or NC connected in series in any quantity. With the...
Lightning detector (CB19966E)
This circuit, suggested by a 1975 documentation, detects an electrical discharge in a storm by...
Absolute Value Circuit (CB7070E)
Found in an old Electronic Design, this circuit provides an output voltage that is the absolute...