Differential Rumble Filter (Elliptic EQ) Wireless World

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Differential Rumble Filter (Elliptic EQ) Wireless World

Post by mediatechnology » Sat Jun 11, 2016 12:35 pm

This is a simple "Differential Rumble Filter" (also an Elliptic Equalizer*) from Wireless World:

"Differential Rumble Filter," J.P. Macaulay, Wireless World, Sept 1979 pg 75.

"Differential Rumble Filter," J.P.Macaulay, Wireless World, Sept 1979 pg 75.

A nice circuit. Other than perhaps its utility as buffers, the use of two inversion stages seem redundant.
The low pass-filtered outputs could be summed and a single inverter used in the interest of efficiency.

See also: http://www.renardson-audio.com/phono-1.html

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