am2140 res filter coming-- in frac and dotcom/MU

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synthcube
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am2140 res filter coming-- in frac and dotcom/MU

Post by synthcube » Sat Dec 14, 2013 7:06 pm

This is the analog metropolis am2140 resonant filter clone of e u systems from rob keeble.

we have PCBs and frac panels in stock (1u wide) configured for banana or traditional jacks. Kits and assembled modules are coming. It's not loaded on the webstore yet, but will be soon.

This complements our frac am4023 filter, and will be followed by the am3320 filter as well.

This is a simple demo using a tri wave out. More demos and pictures to come!
http://soundcloud.com/synthcube/am2140- ... lter-synth
Last edited by synthcube on Fri Oct 16, 2020 10:41 am, edited 1 time in total.
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monstrinho
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Post by monstrinho » Sun Dec 15, 2013 10:31 am

The resonance on that thing is crazy! Emu modular stuff has always been something that interested me in the abstract, but they're so rare and so expensive that I had long ago abandoned the idea that I'd ever actually own any of it. I'll definitely be ordering one as soon as it goes up on your site.

:yay: :yay: :yay: :yay:

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Post by rezzn8r » Sun Dec 15, 2013 11:07 am

Nice! :sb:
Thank-you, synthcube for bringing all this cool stuff to the Frac format. :hail:
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eMu Resonant Filter - AM2140 - how to use it

Post by MuadMusic » Sun Jan 13, 2019 11:17 am

I've got the original technical catalog for the eMu modular synth. They have a boat load of filters available. The AM2140 resonant filter is a 12db/oct state variable filter (there are some still available at Synthcube). It features vc Q as well as output mixing of the LP/BP/HP outputs. "The Resonant Filter is an audio filter with an output capable of producing virtually any two pole pass characteristic. "
Per the manual, this filter was design as a "post processor" to a synth voice. It was possible in the eMu to have a number of them that could be in series or parallel. There was also a "Resonant Filter Bank" controller which could drive the frequency (and Q) of all of the 2140s from a single input.
"The Eµ 2145 Filter Controller allows voltage control of the frequency of two banks of Eµ 2140 Resonant Filters. Each bank of filters may contain from one to four 2140 units connected in any series or parallel combination. The bank center frequency will be determined by the 2145 controller while the formant shape will remain unchanged."

My question is "has anyone done any work with two or more of these filters, used in the architecture described above?

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Re: am2140 res filter coming-- in frac

Post by MuadMusic » Fri Oct 16, 2020 10:35 am

The new DOTCOM panels for the AM2140 have arrived! I finally completed the first one in DOTCOM format. (photo below)

Here's a tip, if you're wiring up a power connector that is something other than the MOTM power connector, be SURE that the ground pads (2 center ones) are BOTH connected to ground. Otherwise you get a really strange effect with DC offsets and what sounds like a slew/lag when you move the frequency control:
IMG_5513.JPG
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IMG_5511.JPG

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Re: am2140 res filter coming-- in frac and dotcom/MU

Post by synthcube » Fri Oct 16, 2020 10:42 am

lovely! thanks for sharing it!
facebook: https://www.facebook.com/2SynthCube

synthcube webstore www.synthcube.com/cart
music from outer space: www.musicfromouterspace.com
blacet research: www.blacet.com
MOTM DIY Analog Synthesizers: www.motmsynthesizers.com
music from outer space euro smt: www.mfoseuro.com

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MuadMusic
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Re: am2140 res filter coming-- in frac and dotcom/MU

Post by MuadMusic » Fri Oct 16, 2020 4:31 pm

One other technical item. Here are the wiring details I used wiring the PCB to the panel:
AM2140dotcomPanelWiring.png

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