5-tube 3W Amplifier (T478E)

This circuit was obtained from a 1947 amplifier manual. The circuit makes use of a transformer source, but it can also be battery powered.

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Self-biasing JFET stage (CB25566E)
This circuit was found in Electronics Now magazine and can be applied to any JFET. The circuit has high...
Operational Constant Current Source (CB13407E)
This circuit is from a 1977 National Semiconductor integrated circuits manual. The circuit admits...
Commercial 4-Transistor Radio (CB18321E)
This is a commercial radio circuit for 1967 AM. It was found in Japanese documentation. The...