The last modular synth case/system I'm EVER going to build?

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JohnLRice

The last modular synth case/system I'm EVER going to build?

Post by JohnLRice » Sat Jun 01, 2019 4:07 am

:roll: :lol: Do I need MOAR modular synths? :hmm: :despair: NO! :mad: But, I do kinda like putting them together. Time to stop making 'em and do something with 'em! (I think I've been saying that for 5 years now? :oops: ) Anyways, I thought I'd post about the current last one since I tried a couple things with the power supply that I hadn't tried before.

Ever since I built my DotCom 22 portable a couple years ago I have wished that I had somehow mounted the power supplies in a way that would reduce the vibration trandfered to the case from the transformers, since the hum is pretty noticeable. I haven't wanted to tear that one apart yet to try to improve it but when building this new case I decided to try it and mounted the supply support rails to the case on rubber grommets and also used rubber stand-offs to mount the supply to the support rails. I hope this will reduces the noise a bit . . .we'll see.

I also made a small aluminum guard/shield to cover the AC inputs to the transformer and used pop rivets to mount the AC inlet and other items to the back of the case. And I didn't chop down this case like I've done several times in the past since I kept running into analog modules that wouldn't fit in a shallow case and I decided to put a big linear supply in it instead of using a switching supply again like I have in pretty much all of my more portable cases.

I still need to make a bunch of power cables before I can try it out and I also want to do some minor mods to a couple modules to create normal'd connections for the two "voices". And I need to buy a 2U vent panel for the back and mount it . . . .and I really don't like my wiring work on this one, I think I was getting impatient/lazy and just wanted it to be over with! (part of me wants to redo the wiring but if it works OK I'll forget about it once I'm finished and can't see it anymore)

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kindredlost
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Post by kindredlost » Sat Jun 01, 2019 9:54 am

As usual, these posts are a clinic on hardware and cabinet design. Good job Johnny Boy! :hail:

EDIT: I did get a chuckle from your tongue'n cheek remark..."Anyways, I thought I'd post about the current last one.." :hihi:

JohnLRice

Post by JohnLRice » Sat Jun 01, 2019 3:51 pm

kindredlost wrote:As usual, these posts are a clinic on hardware and cabinet design. Good job Johnny Boy! :hail:

EDIT: I did get a chuckle from your tongue'n cheek remark..."Anyways, I thought I'd post about the current last one.." :hihi:
Thanks my friend! 8-)

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Mark11Audio
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Re: The last modular synth case/system I'm EVER going to bui

Post by Mark11Audio » Sat Jun 08, 2019 2:01 am

JohnLRice wrote::roll: :lol: Do I need MOAR modular synths? :hmm: :despair: NO! :mad: But, I do kinda like putting them together. Time to stop making 'em and do something with 'em! (I think I've been saying that for 5 years now? :oops: ) Anyways, I thought I'd post about the current last one since I tried a couple things with the power supply that I hadn't tried before.

Ever since I built my DotCom 22 portable a couple years ago I have wished that I had somehow mounted the power supplies in a way that would reduce the vibration trandfered to the case from the transformers, since the hum is pretty noticeable. I haven't wanted to tear that one apart yet to try to improve it but when building this new case I decided to try it and mounted the supply support rails to the case on rubber grommets and also used rubber stand-offs to mount the supply to the support rails. I hope this will reduces the noise a bit . . .we'll see.

I also made a small aluminum guard/shield to cover the AC inputs to the transformer and used pop rivets to mount the AC inlet and other items to the back of the case. And I didn't chop down this case like I've done several times in the past since I kept running into analog modules that wouldn't fit in a shallow case and I decided to put a big linear supply in it instead of using a switching supply again like I have in pretty much all of my more portable cases.

I still need to make a bunch of power cables before I can try it out and I also want to do some minor mods to a couple modules to create normal'd connections for the two "voices". And I need to buy a 2U vent panel for the back and mount it . . . .and I really don't like my wiring work on this one, I think I was getting impatient/lazy and just wanted it to be over with! (part of me wants to redo the wiring but if it works OK I'll forget about it once I'm finished and can't see it anymore)

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Captains Log: Stardate June 7, 2019...

after noticing the Klingon / Borg collaboration of modular wiring... I took notice of the restlessness of the builder... :despair: a well known interplanetary traveler JLR... :yay: he will indeed "re-wire" this cabinet to solve his "UN-easiness" of non-compliant OCD standards of perfect 90° right angles and purposeful strategically placed cable ties in mathematical precision.... :tu: :tu: :tu:

JLR while he states, if it's good enough and tests, it will be "out of sight" and no worries.... we on the Muff all know better !!! :hihi:

He will re-wire !!! To Perfection....

Much laughter and humor ensues... :yay:
"Trust No One, Question Everything..."

JohnLRice

Re: The last modular synth case/system I'm EVER going to bui

Post by JohnLRice » Sat Jun 08, 2019 10:13 am

Mark11Audio wrote:Captains Log: Stardate June 7, 2019...

after noticing the Klingon / Borg collaboration of modular wiring... I took notice of the restlessness of the builder... :despair: a well known interplanetary traveler JLR... :yay: he will indeed "re-wire" this cabinet to solve his "UN-easiness" of non-compliant OCD standards of perfect 90° right angles and purposeful strategically placed cable ties in mathematical precision.... :tu: :tu: :tu:

JLR while he states, if it's good enough and tests, it will be "out of sight" and no worries.... we on the Muff all know better !!! :hihi:

He will re-wire !!! To Perfection....

Much laughter and humor ensues... :yay:
:lol: :oops:

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Rex Coil 7
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Post by Rex Coil 7 » Sun Jun 09, 2019 10:10 am

John, your workmanship just continues to improve with each new construct. Especially your attention paid to metalwork .. up and up the fit and finish continues to climb.

-----> green, me! ---> :cry:

You've been puttin' on a clinic lately!


:tu: :tu: :tu: :tu:

EDIT: ... don't count the number of builds you've done ... just continue following whatever puts your heart and soul at their most restful and happiest zones ... if that means you'll build a hundred new constructs then that's what it means. Follow your heart, never quit, die falling forward.

8-)
Never Quit, Die Falling Forward
5U PROJECT - (skip pages 4 through 6, boring junk) ... https://www.muffwiggler.com/forum/viewt ... highlight=

JohnLRice

Post by JohnLRice » Sun Jun 09, 2019 11:51 am

Rex Coil 7 wrote:John, your workmanship just continues to improve with each new construct. Especially your attention paid to metalwork .. up and up the fit and finish continues to climb.

-----> green, me! ---> :cry:

You've been puttin' on a clinic lately!


:tu: :tu: :tu: :tu:

EDIT: ... don't count the number of builds you've done ... just continue following whatever puts your heart and soul at their most restful and happiest zones ... if that means you'll build a hundred new constructs then that's what it means. Follow your heart, never quit, die falling forward.

8-)
Thanks for your kind words and sage advice! 8-)

BudgetInfinity
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Post by BudgetInfinity » Sat Jun 15, 2019 5:55 am

John, did your efforts here manage to reduce hum?

I have a dotcom system and can't seem to rid it of hum at about -50 db.

JohnLRice

Post by JohnLRice » Sat Jun 15, 2019 10:22 am

BudgetInfinity wrote:John, did your efforts here manage to reduce hum?

I have a dotcom system and can't seem to rid it of hum at about -50 db.
Since this was a new build and I don't have any similar builds . . .with the same case and power supply but without the double rubber isolation . . . I don't know how much of a difference the isolation made. :despair: I have to think that it helped at least a little bit though.

Listening just now in an average room I can notice the hum if I'm about 3 or 4 feet away or closer from the case, further away the hum is masked by background noise, at least to my ears. Previously I had I posted some data from a non-scientific and for fun test (even though that disclaimer was ignored by some :roll: :lol: ) done in my studio which was much quieter and the average increase in noise between being off and on was about +3dB.
viewtopic.php?p=3072612#3072612

Keep in mind that the audible hum from those transformers can vary a lot, even multiple copies of the same part that are brand new can have different levels of acoustic noise and some get worse with age/prolonged use.

What case and power supply model do you have and how is it mounted?

BudgetInfinity
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Post by BudgetInfinity » Sun Jun 16, 2019 7:14 pm

For power I have a synthesizers.com QPS1 (good for 66 modules)

and 2 QPS4's (good for 11 each)


After posting this I had a major epiphany, after spending hour tinkering with moving gear around, disconnecting modules, etc. I discovered that turning off my computer monitors and router in the room next door dramatically reduced the noise. To the point, I think I can move an and consider this solved!

By the way John, are you more concerned with ambient noise or recorded noise. For me, well, I never had an issue with ambient noise or hum from gear, just when it's patched in listening through my mixer or audio interface.[/img]

JohnLRice

Post by JohnLRice » Sun Jun 16, 2019 7:50 pm

BudgetInfinity wrote:By the way John, are you more concerned with ambient noise or recorded noise.
All of the rubber isolation mounts are attempts to lessen acoustic noise. :tu:

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Post by tehfizzle » Sat Jul 13, 2019 2:58 pm

JLR, what screws are you using to fasten the modules here? Thanks.

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Rex Coil 7
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Post by Rex Coil 7 » Sun Jul 14, 2019 12:20 am

tehfizzle wrote:JLR, what screws are you using to fasten the modules here? Thanks.
'em are black ones. Sheeesh. Do I have ta tell everyone everything around here or what?











:hihi: :lol:
Never Quit, Die Falling Forward
5U PROJECT - (skip pages 4 through 6, boring junk) ... https://www.muffwiggler.com/forum/viewt ... highlight=

JohnLRice

Post by JohnLRice » Sun Jul 14, 2019 1:58 am

tehfizzle wrote:JLR, what screws are you using to fasten the modules here? Thanks.
They are Black Anodized Aluminum 6-32 x 5/16" Knurled Thumb Screws from hasteengineering on eBay.
https://www.ebay.com/itm/6-32-x-5-16-Kn ... 0960246460

https://www.ebay.com/itm/6-32-x-5-16-Kn ... 1280528320

https://www.ebay.com/itm/6-32-x-5-16-Kn ... 1280531565

And the larger size that attach the DotCom frames to the rack rails are 10-32 x 7/16 "
https://www.ebay.com/itm/10-32-x-7-16-K ... 0974848823

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Post by tehfizzle » Sun Jul 14, 2019 3:16 pm

Thanks JLR. :bananaguitar:

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