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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5 to 15 V Variable Power Supply using the 7805 (CB10291E)
This circuit was obtained in a 1989 English magazine. Despite using a fixed 5 V regulator, it can...
Monostable Frequency Divider 555 (CB19550E)
With the feedback of the output circuit, the monostable acts as a frequency divider, that is, it...
Video driver with impedance matching (CB20915E)
In this circuit of an old American documentation, the input impedance is the same as the output...