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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100 W Amplifier (CB6279E)
This is one of the channels of an amplifier suggested by Westinghouse in 1970s documentation. The circuit...
Band Pass Filter 741 (CB16220E)
The basis of this circuit is a double T in the feedback, which has the components calculated to...
Negative Ion Generator (CB21000E)
This circuit was obtained from American documentation from the 1990s. The transformer can be a car...