Binary to decimal converter (CB6583E)

This circuit is from an old American documentation using as indicators for the flip-flops neon lamps. This way, the circuit has two supply voltages.

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Headphone Extensions (CB23790E)
The figure shows three circuits for using headphones in amplifiers with speakers that do not have...
Digital transmission isolator (CB20760E)
This shield was found in an American documentation from the 70s. The operational amplifier is from...
Infrasonic oscillator (CB9193E)
This circuit generates signals of less than 10 Hz. We found it in a Popular Electronics from the...