Matrix Mixer

 

Bandpass Gyrator Filters or almost an Octave filter

 

Bandpass Gyrator Filters or almost an Octave filter as presented by helge-h here at electro-music forum

i made 4 of these filters as part of my Matrix Mixer ,too bad that more then 6 position switches are really expensive ,but that is the only extra thing you need to expand this filter , i installed the capacitors on the switches as that makes sense to me

Matrix Mixer

 

Matrix Mixer with gyrators as presented at electro-music forum ,this matrix mixer is with a twist ..each of the four stages has one input set to go thru the bandpass filter with rotation switches dedicated for purpose of filters set in the left side ,the upper and lower filter have two settings for resonance selectable via switch ,the 2nd and 3rd stage's 2nd and 3rd input have an attenuator switch ,as well as the 4th channel ,there was not enough space but in retrospect i'd add switchable boost on each channel in a form of additional 10 or 15K resistor at the output opamp ,the gyrator filters as expected make nice sinusoidal tones in feedback .This is really an active matrix mixer from CGS schematic ,each row can be set to unipolar or bipolar mixing and can be used for audio or cv mixing .

----- NOW THIS MATRIX MIXER IS NO LONGER FOR SALE -----

This unique Matrix Mixer with 4 Filters is for sale for 150EU + Shipping ,it works on +/-15V or +/-12V, i can include external PSU if you don't have one already but that might increase shipping costs , can ship worldwide with UPS ,payment with Pay Pal ,contact me for more info on vladribarski@gmail.com