Dolby noise reducer (CB21105E)

This circuit was found in a National Semiconductor Handbook from the 1990s. The integrated circuit used is from the time and the circuit is stereo.

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4046 oscillator (CB9221E)
This oscillator with the PLL 4046B was obtained from a 90s Radio Electronics. The circuit...
Crowbar (CB8361E)
This protection circuit trips by quickly blowing the fuse in the event of an overcurrent. The circuit is...
Complete FET Test (CB19255E)
This circuit is intended for the testing of junction FETs, providing several reading options...