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 |

Timer for magnifiers (CB8343E)
Found in a 1965 General Electric Hobby Manual, this timer was originally created to operate with...
Melody circuit (CB8007E)
Found in a 90’s Radio Electronics magazine, this circuit uses a component from the time, difficult...
Who is the Fastest? (CB203E)
Only one LED is turned on when S1 and S2 are pressed. The LED that will be on is just the...