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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FET Input Operational Stage (CB14620E)
The presented circuit was found in the National Semiconductor FET Databook. The setting applies to other...
Amplifier for 12 V (CB8962E)
This configuration with the LM383 appears elsewhere on this site. The circuit shown was obtained...
High Impedance Preamplifier (CB941E)
This very high input impedance preamplifier is from a publication of 1977 but can also be mounted...