Visual metronome (CB21062E)

Based on the well-known LM3909, this LED pulser circuit was found in American documentation from the 90's. The power supply is only 1.5 V.

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Mini amplifier (CB21958E)
Found in a publication by Gernsback from 1960, this circuit makes use of germanium transistors of the time....
Isolated Shield for Motors or Relays (CB23724E)
To control relays or DC motors safely with double isolation via the parallel port, we suggest the...
Guitar Expander and Compressor (CB13995E)
This circuit is from a 1975 Sperimentare (number 11). The circuit uses optical coupling for a...