60 seconds delay lock (CB7231E)

This General Electric circuit triggers on after 60 seconds. The circuit is from 1967 but can be implemented with current components.

| Clique na imagem para ampliar |

Magnetic Field Tracer (CB22346E)
This circuit uses a Hall device from that time as a sensor. The circuit is from an English...
Alternating tone siren 555 (CB9202E)
Found in Radio Electronics from the 90s, this siren finds many variations on this site. The...
Sinusoidal and Rectangular Oscillator (CB19259E)
This audio generator that produces both rectangular and sinusoidal signals was found in a...