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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400 Hz square generator (CB8954E)
This circuit was found in a 1968 documentation. The circuit generates three rectangular signals...
5 V To 3.3 V SMD Converter LTC1147-3.3 (CB14607E)
This circuit was obtained in the Linear Technology Applications of 1997. The circuit uses common...
Musical Bell (CB16731E)
We found this circuit in a 1992 documentation. When the button is pressed, the circuit produces a...