Steam locomotive (T315E)

This 1967 modeling circuit mimics the whistle of a locomotive. The steam-shrieking wheezing is set in a 2k2 potentiometer.

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Power Supply with SCR from 0 to 16 V x 5 A (CB3842E)
We found this thyristor power supply in a 1987 documentation. It uses common SCRs as rectifiers and...
Varicap in the Tuning Circuit (CB4102E)
The figure shows how to use a varicap in a conventional tuning circuit. The circuit may be an...
SSB Balanced bridge modulator (CB4109E)
This circuit is from a 1980's documentation for telecommunications. The circuit is used in SSB and...