DC amplifier with transistors (CB21819E)

This circuit was found in Mullard's 1960s transistor manual. The circuit uses germanium transistors from the time.

| Clique na imagem para ampliar |

Photosensitive power circuit (CB25193E)
This circuit can be used in alarms by activating a relay or a current load that depends on the...
LM3900 Non-Inverter Comparator (CB14207E)
The circuit given below was found in the National Semiconductor Linear Applications Handbook. The...
Phototransistor Currente Control (3) (CB14641E)
The current of this circuit is determined by a PNP transistor. The circuit is suggested by Texas...