3-decade VCO (CB21326E)

This circuit generates signals from 10 Hz to 10 kHz. We found it in a Popular Electronics from the 90's. The components admit equivalents.

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Light intensity meter (CB7340E)
This circuit was found in a Philips documentation from 1970. The components are of the time,...
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This circuit divides the frequency of a 2 kHz signal by 2. The circuit was found in Philips...
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This circuit was found in an English publication. The components are current, and the transformer must be...