Preheating circuit (CB7187E)

This circuit was found in a General Electric manual from 1970. Its purpose is to provide a preheat to a filament lamp.

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DC Motor Control (CB12292E)
This circuit is from 1977 documentation, but can be assembled with BC548 for Q1, Q2 and Q4, BC558...
FET caracteristic curve plotter (CB20730E)
Found in American documentation from the 90s, this circuit uses components that are still common...
Piezoelectric Mike Preamplifier (CB786E)
This high impedance input amplifier is suitable for the use with piezoelectric sources such as...