Modulated light receiver (CB8787E)Modulated light receiver (CB8787E)

This circuit for an optical audio link using LED or LASER was found in a 90s QST magazine. The circuit can use operational amplifiers like the 741.

| Clique na imagem para ampliar |

Up to 500 kHz Pulse Generator (CB13452E)
This circuit was found in an old documentation and can be implemented with BC549 transistors. The...
AM Receiver (CB21558E)
This mid-waveband receiver was found in a book on transistors from 1954. The antenna coil is of...
Micro Inverter for 23V Multimeter (CB15853E)
Old multimeters used a 22.5 V battery for high resistance measurements. If you have one, you...