Moog 904A PCB photos?

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mark37
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Moog 904A PCB photos?

Post by mark37 » Mon Jun 24, 2019 11:54 am

Hello there!
I'm trying to make a faithful replica of the 904A filter instead of building a new/improved/adapted version.. that will imply cloning the PCB, but as I don't own an original module I need to draw it in Eagle CAD starting from a decent set of pictures. I already did the job with the 901a/b and the 902 modules and as you can imagine it's really tedious, but since I didn't find any good material I thought someone had to do it :eek:
All the Eagle files will be uploaded somewhere and shared for free, as I'm not making any money here.
If someone had any high resolution photo and wanted to share them with me, or if he was so brave to disassemble a working filter just for taking some picture that would be fantastic.
The main problem is that the 904A is made up with 2 boards, so I cannot easily find the detail of the internal side of them since one is covering the back of the other. :bang:
Any help will be greatly appreciated!
Thank you all!

JohnLRice

Post by JohnLRice » Mon Jun 24, 2019 1:08 pm

For what it's worth, I used to have a lovely Don Martin era Moog 904A (had to sell it for financial reasons years ago :waah: ) but I had made a vides with some close up shots of it, in particular there are a couple images of a light shining through the PCBs that might be helpful to you?

[video][/video]

KSS
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Post by KSS » Mon Jun 24, 2019 4:31 pm

Download the modular moog 16.5Meg archive at synthfool.com/docs. Lots of PCB pics in there.

Find more at the bob moog foundation archives.

mark37
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Post by mark37 » Tue Jun 25, 2019 4:46 am

JohnLRice wrote:For what it's worth, I used to have a lovely Don Martin era Moog 904A (had to sell it for financial reasons years ago :waah: ) but I had made a vides with some close up shots of it, in particular there are a couple images of a light shining through the PCBs that might be helpful to you?

[video][/video]
Thank you, your photos are still my best option.. hope to find something easier to work with..

mark37
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Post by mark37 » Tue Jun 25, 2019 4:50 am

KSS wrote:Download the modular moog 16.5Meg archive at synthfool.com/docs. Lots of PCB pics in there.

Find more at the bob moog foundation archives.
I just looked at the entire moog section on synthfool, I found some useful schematics but unfortunately there are no pcb pics..
Already got the 902 and 903 layouts from the bob moog foundation website , I will ask them if they also have the 904a.. (904b and c already published if I'm not wrong)..
Thank you!

leonardo
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Post by leonardo » Tue Jun 25, 2019 4:35 pm

I have some photos of the pcbs...

leonardo
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Post by leonardo » Tue Jun 25, 2019 4:37 pm

...but need to write at least 2 posts before being allowed to post pics...

leonardo
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Post by leonardo » Tue Jun 25, 2019 4:55 pm

...and I'm not so good in attaching photos... (sorry)

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Post by leonardo » Tue Jun 25, 2019 5:07 pm

ok, here it goes

Image

Image


Greetings

Leonardo

mark37
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Post by mark37 » Thu Jun 27, 2019 2:08 am

leonardo wrote:ok, here it goes

Image

Image


Greetings

Leonardo
You are the man! Have you also got the other side of both of them?

leonardo
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Post by leonardo » Thu Jun 27, 2019 11:37 am

Image
Image


Enjoy !!

Leonardo

mark37
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Post by mark37 » Thu Jun 27, 2019 12:50 pm

Thank you very much!! I'll do my best 8-)

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shoegazer86
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Re: Moog 904A PCB photos?

Post by shoegazer86 » Sun Mar 22, 2020 10:57 am

What's the dimensions of the Moog modular pcbs? Can't seem to find that info readily available...

I am having a crack at this too for other reasons, mainly for squashing a similar looking PCB into a 4U size.
The MEMS Project
Modular Electronic Music Systems
University of Michigan

KSS
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Re: Moog 904A PCB photos?

Post by KSS » Sun Mar 22, 2020 2:37 pm

shoegazer86 wrote:
Sun Mar 22, 2020 10:57 am
What's the dimensions of the Moog modular pcbs? Can't seem to find that info readily available...
Use the connector finger spacing to scale for the full size. Span as many of the fingers as you can. Knowing the spacing is .156" 3,96mm you have what you need to get good accuracy. Then check against components which will be in .100" 2.54mm units.

From the photos just above your post, you know the front panel is 8-3/4" and the tabs are .400". Subtracting the .063" frame gives a max PCB height of 7.825". This also suggests the phenolic and lucite nut bars are 7.812". Making a reasonable guess for PCB to be 7-3/4" H. Width can be scaled from this.

Of course, none of this is needed if someone actually masures theirs, as long as their measurement is accurate. I've not had good success getting accurate measurements from most musicians.

edit: Applying this to a 902 PCB, it appears the PCB is 7.5" x 4.812 inclusive of fingers and 4.312 cutting fingers off flush. Resistor pad spacing appears to be .700" Transistor 'triangles' .200 x .100.

Also noted that phenolic lucite bars are shorter, being attached to frame rear rather than top and bottom. It would be the aluminum frame to PCB struts that are of length to fit vertical frame inside height. /edit

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