Gas ignition (CB7075E)

This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a gas lamp of the time.

| Clique na imagem para ampliar |

Hearing Aid Amplifier (CB21549E)
This circuit is from a 1954 transistors publication. The transistors are the CK722 among the first...
Head and Tail (CB4878E)
This sophisticated circuit of the coin-toss game was found in an American 1980s documentation. The circuit...
Interval for wiper (CB22113E)
This windshield wiper interval was found in an old documentation. The SCR can be the C106 and the...