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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Headphones Amplifier (CB972E)
We found this circuit in an old publication (1977) using common transistors at the time and now...
Wien Bridge Oscillator (CB4922E)
This circuit uses an operational that is not currently common. We found it in an old American...
table divider by 2 (CB25675E)
Bis This two-transistor circuit was found in the January 1994 issue of Electronics Now magazine. The...