Multiplexed AD Converter (CB9023E)

This 8-channel converter was found in a 1970s American documentation. The integrated circuits used are not common today.

| Clique na imagem para ampliar |

Multiple Inputs Preamplifier (CB18567E)
This circuit was found in Japanese documentation from the 1960s. It is a commercial circuit with...
Active Middle Control (CB13927E)
This tone control was obtained in the Audio Handbook of the National Semiconductor of 1977. The...
Crystal Elemental Radio (CB18395E)
This simple receiver for listening on the phone was obtained in a 1960 documentation. The circuit is...