Constant current source (CB8822E)

This 2mA source was found in a 1968’s Philips documentation. The transistor may be the BC549.

| Clique na imagem para ampliar |

Telegraphy Oscillator (CB24122E)
This circuit was found in the April 1971 Radio Electronics magazine. The transformer is the type...
Double Manipulator Luminous Experimental Telegraph (CB17967E)
The telegraph communication system has been out of use for a long time, so the montage presented has...
Delayed relay (CB10191E)
This simple SCR delay circuit for activating a relay was found in documentation from the 1980s. The...