Fast log generator (CB7595E)

We found this circuit in a 90s Popular Electronics. The operational amplifier can be replaced by current equivalents.

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Wien Bridge Oscillator MC1776 (CB4498E)
The integrated circuit used in this project is not common today, but it can be implemented with more...
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Found in an American publication from 1969, this circuit can be adapted to be used as a shield....
Ammeter (CB9660E)
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