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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Optical Shield TTL – I (CB1323E)
This circuit has been found in an old documentation, but can be used as input shield for current...
Wien II Bridge Oscillator (CB4924E)
This circuit generates signals from 0.01 Hz to 10 kHz, but uses unusual components today. The...
Timer-Push Button (CB23958E)
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