Photometer for enlarger (CB8342E)

This circuit for old photo enlargers was found in a 1970s RCA manual. The components are from the time, but modern equivalents can be used.

| Clique na imagem para ampliar |

741 Audio Amplifier with Single Source (CB25289E)
This circuit of a few tens of milliwatts of power requires a single source. We found it in a Radio...
High Power LED Modulator (CB847E)
This circuit is suggested by Texas Instruments in his Optoelectronics Sourcebook. The transistors...
12V Flasher (CB5201E)
This circuit used in signaling for boats, cars or barriers was found in a 1980s documentation. It still...