4 to 32 minutes timer (CB21437E)

This circuit was found in a 1967 publication. Transistors can be modern general purpose. Component values can be changed for other timings.

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Bistable (CB22280E)
This flip-flop or bistable was found in a publication about transistors from the 60's. The circuit...
Phono preamplifier LM387 (CB24941E)
This preamplifier circuit for magnetic cartridges was found in the March 1986 Radio Electronics magazine....
100 kHz Oscillator (CB21556E)
This oscillator was found in a book on transistors from 1954. The transistor is from the time, and...