3-decade logarithmic AD (CB9024E)

This circuit was found in a 70s American documentation. The converter can be of any type and the power supply for the operators must be symmetrical.

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Going Astern Alert (CB4774E)
We found this circuit in a Popular Electronics of the 90s. The circuit still uses light bulbs, but...
Alarm and current sensor (CB5285E)
This circuit is from Linear Technology 2005 documentation. The circuit is based on company...
15 V x 1 A power supply uA723 (CB19023E)
The integrated circuit used in this power supply is no longer very common in power supplies today....