Modulated infrared emitter (CB7251E)

Found in a 1968 Mullard manual, this circuit can function as an infrared audio link. The transistors can be the BC548.

| Clique na imagem para ampliar |

Automotive Inverter 25 W (CB7179E)
We found this circuit in a 1968 Electronics World. The transistors are from the era and...
Instrumentation Amplifier (CB14497E)
There are several manufacturers of the integrated circuit used and it also admits equivalents. The circuit...
Precision Voltage Follower (CB13393E)
This circuit is from 1971 American documentation. Transistors are still common except for 2N2060...