4-band microammeter (CB8210E)

Found in a 90s Radio Electronics this circuit requires precision resistors in the dividing network. The font must be symmetrical.

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Car Battery Checker (CB9529E)
We found this circuit in an American documentation from the 90s. Through an LED it indicates the...
ADuM120N and 121N Two Channel Digital Isolators (COM065E)
August 2016 - It can be purchased from Mouser Electronics the new digital isolators ADuM120N and...
TTL Active Cycle Control (CB13825E)
In this circuit, from a documentation from the 70's, we have the way to control the active cycle of...