Logarithmic generator (CB7593E)

This circuit has a 100 dB dynamic We found it in a Popular Electronics from the 90s. Equivalent operational can be used.

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Mechanical Oscillator (CB20496E)
This circuit can be used in decoration or to draw attention, in a “fake” assembly for example. What he...
Security Alarm (CB4866E)
This sophisticated alarm with traditional components was found in an ancient American...
1957 1-Transistor Radio (CB14728E)
We found this AM radio in a 1957 transistor application manual, published by Raytheon. The...