Band Switch (CB21254E)

This switch or band selector for receivers was found in a Popular Electronics from the 1990s. The circuit uses a PIN diode.

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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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