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 |

Three Tone Oscillator (CB12661E)
From an old manual of unijunction transistors, this oscillator generates different tones when the...
Voltage Regulator 100 V x 20 mA (CB12670E)
A negative floating regulator capable of supplying an output voltage of -100 V with regulation of 20 mV for...
Toxic Gas Detector (CB6365E)
Found in a Hands On Electronics of the 80s, this circuit makes use of a gas sensor of the time....