Scratch filter (CB22152E)

This filter for scratched disc noise was found in an English documentation from 1989. The integrated circuits used are still common today.

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Christmas Tree (CB26117E)
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Voice Suppressor (CB4751E)
This interesting circuit found in a European publication from the 1990s eliminates the voice that...
Frequency Comparator (CB20113E)
This circuit also functions as a phase detector. The components used are not common. We found this...