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
Related Content:
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Elliptic Equalizers Using MS Matrix and LRS Width Controller https://www.proaudiodesignforum.com/for ... ?f=7&t=736
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Differential Rumble Filter (Elliptic EQ) Wireless World
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