MMI Eurorack TwoNineFive 10-Channel Comb Filter PCB/Panel

MMI Eurorack adaptation of the Buchla Model 295 10-channel comb filter

This is for a PCB & Panel only for the Eurorack format

Availability: In stock




  • Eurorack adaptation of the Buchla Model 295 10-channel comb filter
  • 10 LED sliders control the amplitude of each band sent through the SUM output
  • Individual channel outputs to the right of each slider
  • Tunable band frequencies, Q's, and amplitude via trim pots on the back of the module.

This recreation of the Model 295 has been in my head since before I owned any modular. After using a restored Buchla at the Oberlin Conservatory of Music, the 295 became one of my favorite modules in the whole case. Buchla modular is far out of my budget so with the original schematics in hand, I made a much more compact 3U version of it. The circuitry is exactly the same, though more modern op-amps have to be used since the ones used in the original design are no longer available.

Specs & Downloads

Specs & Downloads

Manufacturer MMI
HP 14
Depth 25mm
+12V No
-12V No
+5V No
Additional Resources BOM


Customer Reviews (1)

A Very Unique Module! Highly Recommended!!Review by Mr. Mojo Risin'
This is an adaptation of the Buchla Model 295 10‑Channel Comb Filter

Looks are deceiving. At first glance it looks like an ordinary Equalizer but it's much more than that. This Comb Filter adds a delayed version of a signal to itself causing constructive and destructive interference. The crazy sound filtering you can get out of this module is impressive!

About 90% of all components are 0603 SMT so it takes a little longer than your average through‑hole build. It is absolutely imperative that you solder R13, R39, R17, R37, R19, R35, R25, and R33 properly before mounting the trim pots as they will be very difficult to reach once all components are in place

There are eight trimpots on the back which allow individual tuning of each Band Frequency, Q's, and Amplitude. Mouser was out of stock of the red sliders at the time of my build so I opted to go with orange and it looks great sporting the 10 LED sliders. This Bournes slider pot is available in three colors

Red: (P/N: 652-PTL20-10R0-103B2)
Green: (P/N: 652-PTL20-10G0-103B2)
Orange: (P/N: 652-PTL20-10O0-103B2)

The BOM shows a pricey SMT 10‑Pin Power Header. I'm notorious for being a cheapskate so whenever possible, I try to use inexpensive parts at hand and modify. I took a 20¢ Double Row Pin Header and used small needle‑nose pliers and bent the pins at opposite right angles. It worked great but soldering that part was a slight challenge because of the tight quarters. Even if you use the expensive part, this component will be a tricky soldering job (Posted on 5/2/2019)

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