1-quadrant logarithmic converter (CB7333E)

This temperature compensated circuit was found in a Popular Electronics from the 90s. Integrated circuits and transistors are from that time.

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Vox (CB22073E)
This sonic switch, sound relay or simply vox uses a medium impedance speaker as a microphone. The...
Line transformer (CB23710E)
This circuit is an impedance adapter. The circuit is from a Radio Electronics from April 1966. The...
Walk Talkie for 1 km (CB3826E)
This circuit using components that are still common in our market was found in a 1987...