Bipolar Current Level Detector (CB6629E)

The circuit shown was found in an American documentation from 1964. The circuit uses transistors of the time and the indicators are small lamps.

| Clique na imagem para ampliar |

Random Neon Flasher (CB4541E)
I found this simple circuit from an English magazine from 1984. The circuit can be easily...
Radiation detector (CB8660E)
Information about the high voltage transformer and the detecting circuits was not given in this...
Voltage Calibrator (CB22214E)
The purpose of this circuit is to supply a direct reference voltage from the power grid. The...