Subwoofer Simulator (CB25130E)

This circuit consists of a bass filter that can be used as a subwoofer in a sound system. The circuit is from a Radio Electronics from May 1988.

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Crystal switched oscillator (CB9632E)
This oscillator with crystal for overtone operation was found in an old American documentation. The coil...
Basic PLL (CB21757E)
In the figure we have a basic PLL circuit with the LM567 or equivalent. The circuit is from a 1977...
DC and Stepper Motor Controls with the A3906 (CB23592E)
The A3906 integrated circuit from Allegro MicroSystems (www.allegro.com) consists of a single...