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 Forum index » DIY Hardware and Software
Simmons SDS 3 - DIY?
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elmegil



Joined: Mar 20, 2012
Posts: 1489
Location: Chicago
Audio files: 14

PostPosted: Wed Aug 14, 2013 7:32 am    Post subject: Reply with quote  Mark this post and the followings unread

xpmtl:

How hard is the SMT built? I have done one tiny bit of SMT soldering, a bunch of 1206 (I think?) bypass caps on a wogglebug.

I like the idea of 1U MOTM, since that's the format I use, but I'm a bit intimidated by all the tiny things in yours Smile.
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THeff



Joined: Sep 01, 2006
Posts: 218
Location: Florida
Audio files: 30

PostPosted: Wed Aug 14, 2013 10:27 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi elmegil,

I built xpmtl's SMD board and it went together very easy and worked the first time I tried it.

I would recommend three things:

1.) Liquid solder flux for the IC's, they will solder much easier. It doesn't take much, just a little dab on each IC pad.

2.) A good set of tweezers, cheap ones will shoot the part across the room if you are not careful.

3.) A magnifying head lens (depending on your age Very Happy )

If your budget allows, a hot air solder/desoldering machine is really helpful for parts that have more than two leads.
I don't own this model but it will probably work fine. http://www.circuitspecialists.com/i-182127.html

Regards,

Theff
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elmegil



Joined: Mar 20, 2012
Posts: 1489
Location: Chicago
Audio files: 14

PostPosted: Wed Aug 14, 2013 10:58 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks THeff Smile

I have the good tweezers (though I'm not sure offhand where in the mess that is my desk that they have wandered to) and I bought syringes (?) of liquid flux and I think solder too, along with a few schmartboards, because I accidentally bought the SMT version of the CA3140 a little bit back But I haven't actually used them yet.

I appreciate the advice.
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jmejia



Joined: Mar 12, 2009
Posts: 114
Location: portland

PostPosted: Wed Aug 14, 2013 10:59 am    Post subject: Reply with quote  Mark this post and the followings unread

mono-poly wrote:
xpmtl wrote:
I think jmejia is doing an universal board that will work for all formats, an I think he will sell those.

Mine is 1U MOTM format, but i won't sell them. All the info and gerbers files are free to download on my site (sdiy.xpmtl.net). You'll have to send the gerbers to a fab house and source/populate the boards yourself.

Cheers,

x.


Woow great work!
Looking forward to your gerber files!


We'll also be publishing gerbers of our through-hole layout if you prefer (and aren't in a hurry) Still waiting on some replacement parts before we can do the final testing of the layout - but it's def. top priority on the bench right now.
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xpmtl



Joined: Aug 10, 2007
Posts: 158
Location: Brussels, Belgium

PostPosted: Wed Aug 21, 2013 3:21 am    Post subject: Reply with quote  Mark this post and the followings unread

Well Tim responded already, building is not very difficult.

For the resistors/caps, put a small amount of solder on one pad, align the component and slide it in place as you heat the pad. Then solder the other end. For the ICs, use Flux and solder one pin first as you align the component with tweezers. After that solder the remaining pins one by one or use the sliding method ( look on Youtube, there a bunch of tutorials for soldering SMT).

I have a Hot air station but i find the results less clean than with a soldering iron. Usually components pop out of their place when i apply heat. I think my soldering paste is not very good. It's new tho (Chipquick™ water washable leaded)

As for my lack of updates lately, i had a car crash and i need to find/finance a new car so SDIY is a bit on hold... should resume mid cctober when i get back from holidays. I'll make a prototype of the frontpanel then and post the .fpd file on my site.
If anyone wants the file now i can PM it but you'll have to triple check it as it still has errors.

x.

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THeff



Joined: Sep 01, 2006
Posts: 218
Location: Florida
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PostPosted: Wed Aug 21, 2013 8:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

Wow xpmtl,

Sorry about your car man! Shocked that stinks!
Hope you are ok?

Hang in there...

-Tim
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xpmtl



Joined: Aug 10, 2007
Posts: 158
Location: Brussels, Belgium

PostPosted: Thu Aug 22, 2013 1:40 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Tim,

I'm fine, it was just crushed metal and a lot of paper work, waiting for the insurance company to pay back, ordering new car, etc...

I'll get the new car when i come back from holidays early october so things will settle down by then.

x.

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diablojoy



Joined: Sep 07, 2008
Posts: 795
Location: melbourne australia
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PostPosted: Thu Aug 22, 2013 2:13 am    Post subject: Reply with quote  Mark this post and the followings unread

SMT isnt difficult at those sizes
I normally do that size with a standard iron , normal solder and little blobs of bluetack to temporarily hold things in place while i solder the other end:lol: certainly quicker than thru hole

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silwerfeldt



Joined: Aug 21, 2013
Posts: 2
Location: sweden

PostPosted: Fri Aug 23, 2013 4:03 am    Post subject: Reply with quote  Mark this post and the followings unread

I just want to say thank you for all your hard work and I really look forward building my SDS 3. I´ve always wanted to tray it out...

Cheers
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jmejia



Joined: Mar 12, 2009
Posts: 114
Location: portland

PostPosted: Fri Aug 23, 2013 10:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks! Been waiting (too long) on replacement FETs from futurelec to do final testing! Hopefully they'll get here soon!
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paulstone



Joined: Apr 14, 2013
Posts: 22
Location: ITA

PostPosted: Thu Aug 29, 2013 1:25 am    Post subject: Reply with quote  Mark this post and the followings unread

wow interest in this project and pcb's
great
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silwerfeldt



Joined: Aug 21, 2013
Posts: 2
Location: sweden

PostPosted: Sun Sep 15, 2013 11:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Any news on the PCB´s?
Sorry for stressing but I´m so thrilled to know that maybe I´ll get to build a SDS 3 Clone!

Cheers and keep up the good fantastic work
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arnoid



Joined: Aug 23, 2009
Posts: 55
Location: Belgium

PostPosted: Mon Nov 04, 2013 3:20 am    Post subject: Reply with quote  Mark this post and the followings unread

Any news ?
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duff



Joined: Jun 02, 2013
Posts: 7
Location: UK

PostPosted: Sat Jan 04, 2014 3:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Just wondering if this is still happening.
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DickyKnee



Joined: Mar 30, 2014
Posts: 5
Location: Thailand

PostPosted: Fri Apr 11, 2014 10:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi all,

I only recently came across this thread and got real exited and purchased some boards.

Ive been looking at the schematic, and see some potential improvements (if there is ever another design revision) since most people seem to be aiming to use this in a modular setup, with a shared power supply.

1. LEDs. Namely connected to the ground. The lfo led bothers me the most because its hard switching 10-20mA continuously onto the ground. better if it was connected to a rail. Or if crazy anal, also constant current sourced with a shunt FET to switch it. As much as I would like the LEDs, I'll probably leave them off my build because of this. Another thought with the lfo is to stick a bi-colour in the feedback around the Schmitt trigger.
2. The voltage rails being used as voltage references. The resistor in the noise source, pitch/offset/null pots. There is possibly some others.

It probably works fine as is, but good practice in modular design is to use the ground as a reference (not a current sink), use voltage references for other voltages and to use the power rails only for power. Much of this would not have been an issue in the original stand alone unit.
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n.d



Joined: Dec 15, 2011
Posts: 22
Location: Argentina

PostPosted: Wed Jul 30, 2014 12:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

So, you know

BUMP!
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