15V symmetric power supply (CB21188E)

This circuit was found in a Radio Electronics from the 90's. The maximum current is 1 A.

| Clique na imagem para ampliar |

Tuned active antenna (CB8412E)
Found in a 90s Popular Electronics, this circuit allows to select the operating ranges between...
Telephone amplifier (CB7502E)
This circuit was obtained in a 1960 transistor manual from Sylvania. The circuit uses small...
Unijunction Metronome (CB23525E)
This simple unijunction circuit is from a Radio Electronics from July 1963. It can be assembled with a...