[IN STOCK] L-1 2180VCF Eurorack.

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L-1
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[IN STOCK] L-1 2180VCF Eurorack.

Post by L-1 » Fri Nov 30, 2012 8:48 am

Detailed info on my site: http://l-1.su/2180VCF.html



I made THAT2180 based multimode VCF. Original design.Two chips used.
It works, sounds clean. Only I need now trim correct CV range. Q and cutoff are CV controllable, LP BP HP outs.
Will post news into this thread.

:sb:
Last edited by L-1 on Wed Oct 02, 2013 10:33 am, edited 3 times in total.

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msprigings
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Post by msprigings » Fri Nov 30, 2012 9:09 am

Awesome can't wait to hear more details.

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Post by NorthernLightX » Fri Nov 30, 2012 10:16 am

Great news, now I know what to do with those spare THAT ICs... downside is my backlog just grew even larger :)

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Peake
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Post by Peake » Fri Nov 30, 2012 11:52 am

This should be good!

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Emalot
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Post by Emalot » Fri Nov 30, 2012 1:10 pm

L-1 you're a genius!

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SMS303
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Post by SMS303 » Fri Nov 30, 2012 1:22 pm

Emalot wrote:L-1 you're a genius!
ho ho..... Albert Einstein and Isaac Newton were real genius'.....
L-1 fully understand THAT2180's and felt in love with them 8_) ;)

Way to go Alex! :tu:
------------> Jaime Murray does Capua...... ------------------------------------------>

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Emalot
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Post by Emalot » Fri Nov 30, 2012 1:56 pm

Ok, what i want to say it's more:
L-1 tu es génial!
L-1, you propose the best SDIY design this last time!

(Where did you buy your THAT2180?)

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SMS303
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Post by SMS303 » Fri Nov 30, 2012 2:02 pm

Emalot wrote:Ok, what i want to say it's more:
L-1 tu es génial!
L-1, you propose the best SDIY design this last time!
:mrgreen:
------------> Jaime Murray does Capua...... ------------------------------------------>

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hpsounds
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Post by hpsounds » Fri Nov 30, 2012 2:58 pm

:eek: :wow:

Hédi K.

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wavehead
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Post by wavehead » Fri Nov 30, 2012 3:43 pm

what would this filter sound like... anything to compare it to?

it doesn't seem as if there are a lot of options for super precise, clean filters with big ranges (especially band-pass filters). would be awesome if something with the cutoff range, bandwidth and tracking of cwejman BP filters existed. L-1 I'm looking at you!

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Synthbuilder
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Post by Synthbuilder » Fri Nov 30, 2012 5:05 pm

I've done this too. I think it was the SVF Issue 4 which first came into being when the CA3280 stopped being produced. Although I liked the sound of it I found the resonance hard to tame when the filter was oscillating - I put this down the insufficient gain matching between the two THAT devices. In the end I went back to the old LM13700. I do still use the THAT2180 in my one pole HP & LP VCFs on the noise module though.

Tony

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Dr. Sketch-n-Etch
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Post by Dr. Sketch-n-Etch » Fri Nov 30, 2012 7:43 pm

How would a THAT2180 VCF be all that different from an SSM2164 VCF (of which I've designed and built a half dozen)?
We're a perfect match. Never believe anything else.

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Post by wavehead » Fri Nov 30, 2012 8:16 pm

dave have you etched up a board for your SVF yet? that looks like a nice contender for a precise BP with nice tracking, etc.

the 2164 does seem like an under-utilized chip that works perfectly for a ton of different uses and I'm surprised to not see more circuits using it.

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Post by L-1 » Fri Nov 30, 2012 9:33 pm

First sample. Not very accurate record sometimes overloaded. Will record better later.
I think I need to reduce Q range.
I feed EG to Q CV and LFO to cutoff CV.
Attachments
2180VCF.mp3
(4.72 MiB) Downloaded 194 times

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Peake
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Post by Peake » Fri Nov 30, 2012 10:53 pm

Dr., all OTA filters sound different. I have a Mankato =and= I like the way the Roland 3109 and SSM2040 sound...all different in good ways.

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Post by Lutin » Sat Dec 01, 2012 9:27 am

I like it! Sounds really pleasant and a bit quirky

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Post by frijitz » Sat Dec 01, 2012 10:03 am

I tried making a VCO with the 2180. It wouldn't even come close to decent tracking. I can't imagine how a filter could possibly do so either.

Ian

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Post by L-1 » Sat Dec 01, 2012 10:05 am

This is simplified schematic. CV can be temperature compensated with two 2K tempcos.


Image

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L-1
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Post by L-1 » Sat Dec 01, 2012 11:41 am

I recorded traditional basic patch with this filter. Sounds promised.
Attachments
2180VCF3.mp3
(2.14 MiB) Downloaded 152 times

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Post by L-1 » Sat Dec 01, 2012 11:55 am

This is the filter itself.

Image

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Peake
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Post by Peake » Sat Dec 01, 2012 12:56 pm

frijitz wrote:I tried making a VCO with the 2180. It wouldn't even come close to decent tracking. I can't imagine how a filter could possibly do so either.

Ian
I have never, ever come close to even wondering if the Buchla 291 and 292 filters track or not. I just use them and have a blast.

:despair:
This is not the place I'd imagined it to be.

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L-1
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Post by L-1 » Sat Dec 01, 2012 1:01 pm

I didn't worked on tracking this filter yet. But THAT2180 has ideal exponential response. Will post the results.

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Post by Graham Hinton » Sat Dec 01, 2012 1:15 pm

L-1 wrote:This is simplified schematic.
This is a twenty year old THAT application note and I did it at Solid State Logic ten years before that (with dbx 2150s).

How exactly are you claiming this to be an original circuit?

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L-1
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Post by L-1 » Sat Dec 01, 2012 1:32 pm

I used the materials of AES 13th international conference signed by Gary K. Herbert and Fred Floru. And calculated all components values from attached equations.

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Peake
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Post by Peake » Sat Dec 01, 2012 4:34 pm

OTA designs using VCAs are as old as the one used in the EMU modular, or older; I'm not an expert. That doesn't matter.

http://html.alldatasheet.com/html-pdf/9 ... M2020.html

L-1, please enjoy yourself making circuits. Thank you for sharing them.
This is not the place I'd imagined it to be.

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