Impact meter (CB7343E)

This circuit uses an impact sensor transistor called Pitran rare today. The circuit is from 1969 American documentation.

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Missing Pulse Detector (CB4828E)
This circuit appears several times in this section and on this site, obtained from different...
Integrated mixer (CB21976E)
This mixer with the integrated circuit CA3130 was obtained from an English publication from 1977....
RIAA Preamplifier (CB3979E)
This circuit is ideal for recovering vinyl media with a linear response from the RIAA curve of the...