Logical optical driver (CB7300E)

We found this circuit in a Motorola documentation from 1968. Phototransistors are common and bipolar general purpose.

| Clique na imagem para ampliar |

Modulated CMOS Siren (CB10794E)
This circuit was found in the Italian magazine Radio Elettronica from September 1977. It consists of a...
World’s largest floating photovoltaic power plant test-bed features ABB technology
ABB drives the energy revolution with newly emerging use of solar power in Singapore Land scarcity has...
Multi Control (CB4383E)
This circuit was obtained from a 1965 magazine, but can still be assembled if we use a modern 6 V...