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 |

Locator transmitter (CB8729E)
This circuit was found in a 1993 Electronics Hobbyst Handbook. The circuit operates in the FM...
Three-phase tester (CB8297E)
Found in a 90’s Electronic Engineering, this circuit tests the three phases of such a supply. The...
MW Wireless Microphone (CB4516E)
The microphone of this short-range MW transmitter should be low impedance magnetic (a small...