5-tube 3W Amplifier (T478E)

This circuit was obtained from a 1947 amplifier manual. The circuit makes use of a transformer source, but it can also be battery powered.

| Clique na imagem para ampliar |

Sleep Inductor (CB12625E)
The critical components of this 1978 circuit are transformers, which, hopefully, can be obtained from...
Timed Fuel Blocker (CB17027E)
This circuit was found in a 1995 documentation, consisting of a car protection system that blocks...
Timer 555 (CB8715E)
Suitable for dual applications, this timer was found in a 90s Popular Electronics. The circuit...