Multiplexed AD Converter (CB9023E)

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

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Voice Filter with LM381 (CB25283E)
This circuit lets through the 300 Hz to 3kHz range that corresponds to the human voice. We found it...
50 mA composite operational amplifier (CB25184E)
This complementary circuit increases the output power of an operational amplifier. Outputs with...
Crystal Oscillator with Divider (CB15753E)
In the figure below we have an interesting circuit for those with a project that requires a...