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 |

Amplifier Protection (CB24882E)
This circuit is used to protect an amplifier from excessive power output that would cause problems for...
Assisted Ignition 2 (CB4349E)
This circuit was found in a French magazine Toute LÉlectronique from 1978. Transistors are not...
Photocell powered frequency standard (CB20521E)
This circuit was found in documentation from the 50's. The circuit uses transistors of the time...