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 |

Manually triggered VCO (CB19082E)
The CMOS 4046 integrated circuit is not very common today, consisting of a very efficient PLL for...
Automatic Telephone Recorder (CB5992E)
This circuit turns on an old cassette recorder when the telephone rings, thus enabling the...
Incandescent Flasher (CB4595E)
This circuit can be used in panel signaling with common incandescent lamp. The lamp will flash at a...