Ramp Generator (CB10040E)

This circuit was found in an integrated circuit manual from the 1980s. The circuit can be designed based on modern operational amplifiers.

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Micro Oscillator (CB21924E)
This very simple 1-transistor oscillator is from Raytheon's transistor manual of the 60s. The...
Crystal Radio (CB14727E)
This circuit is from a 1957 Raytheon transistor manual. The diode can be of general-purpose...
Ultra Simple Alarm (CB16385E)
We have in the figure an ultra-simple alarm found in a 1981 publication. As the author indicates, it is...