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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Heating Circuit (CB12747E)
In the figure we have an interesting possibility that consists of the activation of a heating...
Comparator with AND gate (CB9407E)
This tunnel diode circuit was found in American documentation from 1966. The tunnel diode is the...
One Hour Timer using the 555 (CB1271E)
We found this configuration in documentation from the 1970s, but all components are current. If a...