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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Lights On Reminder (CB12637E)
This circuit activates the horn if the door is opened with the headlights on. The circuit is for...
High Side Transimpedance Amplifier (CB5228E)
This circuit for Laser Diode power was found in a 2005 Linear Technology manual. In the diagram...
Grounding Test (CB13252E)
This circuit tests whether electronics are properly protected with internal grounding. If the...