New project from Psyco X [XDS3]

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satindas
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Post by satindas » Fri Sep 27, 2019 2:42 am

Bodo1967 wrote:
satindas wrote:
Bodo1967 wrote:....a bit more space between the IC legs would be great :D.
Errm... best contact ON SEMI about that.
Also errm...:

I think you may have misunderstood me. All I intended to say was something like "SOIC with 1.27 mm pin pitch is OK for me; SOT-457 with 0.95 mm pin pitch is the limit for me; but TSOP with 0.5 mm pin pitch would definitely be a problem."

;)
Ah! “wrong end of the stick” ... again :doh:
Unfortunately, as far as I can tell those transistors aren’t available in anything bigger so I’m afraid 457s it is. I looked at quad matched (SOIC) but they’re expensive and make the routing quite awkward.
Patrick at diysynth.de has some nice little SMD practice boards if anyone feels the need to brush up their skills.
Last edited by satindas on Fri Sep 27, 2019 8:00 am, edited 1 time in total.
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Bodo1967
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Post by Bodo1967 » Fri Sep 27, 2019 3:28 am

457 is OK. There are about 30 (?) or so matched transistor pairs in the SY-1M, iirc. And that is one great little drum synth which I truly love, and which worked first time, except that i had to reflow some of the ground pads.
... why buy it for $100 when you can build it yourself for $150?

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Re:

Post by realitycontrol » Tue Jan 28, 2020 4:32 am

satindas wrote:
Tue Sep 24, 2019 11:49 am
I’ll be ordering another prototype PCB with a couple of changes and hopefully that’ll be the the last one before I place an for order 200.
How did the new prototype turn out pal?

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Re: New project from Psyco X [XDS3]

Post by Portabella » Fri Jan 31, 2020 9:00 pm

any pics of the populated boards available?

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SMS303
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Re: New project from Psyco X [XDS3]

Post by SMS303 » Fri Jan 31, 2020 9:32 pm

Why don't you have the PCBs assembled by https://www.elecrow.com/services.html?

Assembly costs 0.03 $ for SMD Pads (with stencil) and 0.04 $ for THT pads iirc….
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Altitude909
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Re: New project from Psyco X [XDS3]

Post by Altitude909 » Sat Feb 01, 2020 8:54 am

^
have you used elecrow?

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SMS303
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Re: New project from Psyco X [XDS3]

Post by SMS303 » Sat Feb 01, 2020 5:53 pm

I saw the link at the Dutch Synthforum…. user Anatal / Dikkietrom has experience with escrow as far as i understood.
satindas wrote:
Fri Sep 27, 2019 2:42 am
Patrick at diysynth.de has some nice little SMD practice boards
If you have 200 PCBs, why don't you have Elecrow assemble them? You charge the extra price for this in the kit.
------------> Jaime Murray does Capua.... ------------------------------------------>

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Altitude909
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Re: New project from Psyco X [XDS3]

Post by Altitude909 » Sun Feb 02, 2020 8:10 am

The set up costs for placing several parts isnt worth it. I've actually used Elecrow and after seeing the garbage they sent me, I wouldnt recommend them for anything regardless of what you heard on another forum.

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Re: New project from Psyco X [XDS3]

Post by aabbcc » Mon Feb 03, 2020 11:27 am

Altitude909 wrote:
Sun Feb 02, 2020 8:10 am
The set up costs for placing several parts isnt worth it. I've actually used Elecrow and after seeing the garbage they sent me, I wouldnt recommend them for anything regardless of what you heard on another forum.
Have you tried JLCPCBs assembly service? Saw some.ohotoa on eevblog that didn't look too bad!

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Re: New project from Psyco X [XDS3]

Post by Altitude909 » Mon Feb 03, 2020 6:56 pm

Last I looked at JLC, they had a really limited part set and quirky limitations on what they can do which kinda odd. If was to consider doing something like that (just placing the SMD parts), I'd probably look locally for someone with a PNP and reflow that would be willing to do 1-2 reel job cheap. Pick and place is all economy of scale, loading up the machine is pretty time consuming and makes no sense to do all that work for 1 or 2 parts for a big fab

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Re: New project from Psyco X [XDS3]

Post by 1/7B » Mon Feb 03, 2020 8:14 pm

arghhh...

Right now just finishing 2XV2 versions... yes I Know ...it's been a while... had no time... but nice an clean diy projet anyway... thx Simon !

As Greeta says : "More SMD !! ?? " I can understand the "why" but jesus it is hard for my olds eyes.

Anyway, count me in for one more, this box is really magnificent.

Cheers

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satindas
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Re: New project from Psyco X [XDS3]

Post by satindas » Thu Feb 06, 2020 7:58 am

The lastest prototype was completed before Christmas and is currently getting hammered at Devon Analogue studio... you'll find some nice demos on their Instagram feed.

Although its sounding great and I'm hearing lots of positive feedback I think that due to the cost involved my intial plan to produce 200 kits was perhaps a little overzealous. (The most costly parts at this point are the pots - (42 x Alpha 9mm per unit) ... the cases also come in at almost twice the price of the syncussion cases !)

I have had a number of requests for assembled units and I'll be concentrating on those before I commit to a batch of DIY kits.

SMD Assembly is certainly an option but this would obviously push up the price, possibly beyond what might be acceptable... I'm actually trying to contact my PCB supplier regarding this but for the last week their phones have been on the blink. :despair:
These are bizarre manifestations of untamed high-frequency parasitic oscillations...
www.psycox.co.uk

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Re: New project from Psyco X [XDS3]

Post by tron23 » Fri Feb 07, 2020 1:25 pm

Looking forward to the DIY kit, keep it up! :guinness:

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satindas
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Re: New project from Psyco X [XDS3]

Post by satindas » Fri Feb 07, 2020 6:33 pm

tron23 wrote:
Fri Feb 07, 2020 1:25 pm
Looking forward to the DIY kit, keep it up! :guinness:
That’s what SHE said :hihi:
These are bizarre manifestations of untamed high-frequency parasitic oscillations...
www.psycox.co.uk

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