Frac envelope generators

Blacet, Metalbox, Synthasonic, PAiA and the rest.... a frac frenzy!

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Tubeampguy
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Re: MOTM 1800 Looping EG

Post by Tubeampguy » Sat Feb 23, 2019 10:58 pm

davedatt wrote:
Tubeampguy wrote:
davedatt wrote:Hi, I have 2 FRAC MOTM Looping Envelope Generator PCB's stuffed but no front panels and no Pots. Could someone take pictures of the rear of their 1800 and if possible note the values of the pots. The schematics are unavailable from Paul (HD crash).

Thanks in advance.
dave
I have (over many years) found several MOTM-1800 ADSR's
My first one had been modified with banana jacks. I still haven't figured out how I'm going to fix that one. Here are some of the pictures I have on my computer. The pictures show the lower circuit board for the jacks and the ribbon cable jumper to the main circuit board. Sorry no pot pictures. Hope it helps you?
Thanks, these are helpful, but unfortunately do not answer the Pot question.

There were only a small amount sold unfortunately.
I will likely have to make an educated guess then observe the results then fine tune.
dave
Dave, Working around my work schedule and the bad weather, I can take more pictures and get you the values on the pots. Also some views from the main circuit board & panel details. The 1800's are the best around, They are comparable mostly to the Bananalogue VCS But those are really rare too.
dave
:tu::blacet: :tu:

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werock
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Post by werock » Sun Feb 24, 2019 10:55 am

I wonder how similar circuit wise this was to the MOTM-800 ADSR.

That used 1M log pots for the A, D & R pots and 10k lin for the sustain pot. Might be a good starting point?

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Synthnerd
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Post by Synthnerd » Wed Feb 27, 2019 8:31 pm

I have a MOTM1800. All 4 pots appear to be the same, stamped "DI YA 05 43". I'm frustrated that I can't find my multimeter at the moment to measure values, but I'll take the module into work tomorrow, as we have one there. I read elsewhere that Doepfer and Carvin Amps use DIYA pots and they are usually custom made in large order quantities. Here's a picture:
Image[/img]

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diophantine
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Post by diophantine » Wed Feb 27, 2019 9:54 pm

A multimeter may not tell you the answer, if there is any sort of resistance in the circuit that is in parallel with the two ends of the pot.

A lot of times pots only have the value written on the front, in which case you'd have to pop off the knobs & remove the nuts...

If I had one I'd be happy to do that, but I don't...

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Synthnerd
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Post by Synthnerd » Wed Feb 27, 2019 11:58 pm

Thanks for passing on the knowledge. It was easy to take the front panel off. The pots are marked B50K. I think this means 50K ohms, linear taper. Here's another picture to show how the pots are mounted:

Image

davedatt
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Post by davedatt » Thu Feb 28, 2019 8:17 pm

Synthnerd wrote:Thanks for passing on the knowledge. It was easy to take the front panel off. The pots are marked B50K. I think this means 50K ohms, linear taper. Here's another picture to show how the pots are mounted:

Image
Thank you guys! 50K Linear!

I will assemble will let you know!

dave

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chachi
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Re: Frac envelope generators

Post by chachi » Thu Jul 16, 2020 10:30 pm

bought that MOTM 1800 that was hanging around reverb and then did a bunch of reading waiting for it to arrive and then wished maybe i’d just bought another EG1. :doh:

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Tajnost
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Re: Frac envelope generators

Post by Tajnost » Mon Jul 27, 2020 8:23 pm

Btw... something like DUSG or Maths in frac format would b amazing.

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Cat-A-Tonic
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Re: Frac envelope generators

Post by Cat-A-Tonic » Tue Jul 28, 2020 7:54 pm

Tajnost wrote:
Mon Jul 27, 2020 8:23 pm
Btw... something like DUSG or Maths in frac format would b amazing.
There used to be Bananalogue VCS in Frac.

Some folks have DIY slopes from CGS.

While the Blacet EG1 doesn't have the amplitude following aspect,
it is has plenty of features to make up for it.
I reckon the same is true with TEM (perhaps more so), but I haven't tried it.

What functionality from "DUSG" are you missing?

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chachi
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Re: Frac envelope generators

Post by chachi » Wed Jul 29, 2020 12:39 pm

chachi wrote:
Thu Jul 16, 2020 10:30 pm
bought that MOTM 1800 that was hanging around reverb and then did a bunch of reading waiting for it to arrive and then wished maybe i’d just bought another EG1. :doh:
yeah, sorry paul, the EG1 is king.

maybe what the poster above would like with a Maths/DUSG is the dual nature, some of the portamento patches require the two maths channels. a dual EG1 in a 2U frac would be quite amazing towards this end.

just daydreaming!

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Tajnost
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Re: Frac envelope generators

Post by Tajnost » Sat Aug 01, 2020 6:05 pm

Cat-A-Tonic wrote:
Tue Jul 28, 2020 7:54 pm
What functionality from "DUSG" are you missing?
I never played with maths or dusg, so all my experience based on reviews and demos, anyways, what I find really impressive is of course their dual nature, ability to apply slew, depth control incl. going to negative, option to integrate, mix and process ext. voltages, clever control and patch points for almost everything.

With maths it’s easy to achieve very interesting and rhythmically complex modulations with external gates and cv, I find it quite useful in music.

I guess there are still many other options to discover, at least I can’t think of anything similar in my BugBrand system.

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