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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Crystal Test (CB13253E)
This circuit tests quartz crystals of frequencies between 100 kHz and 10 MHz. The circuit is from...
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We found this circuit at a January 1991 Modern Electronics. The magazine no longer exists, but the...
Simple AM radio ZN416E (CB8203E)
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