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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Scratch Filter (CB6936E)
This filter for the scratching noise common in record players was found in Radio Electronics from the...
Low current in the dark light sensor (CB8311E)
This circuit was found in Philips documentation from 1967. The phototransistor is from that time,...
Peak Indicator (CB5329E)
This circuit is from an old documentation but still current for assembly. Just use BC548 instead...