[sdiy] Latvian CEM Synth IC clones

[rsdio at audiobanshee.com]

I’m spoiled. The local assembly shop will do a small run for me without the cost of a stencil. That saves me $300 each time for prototypes. They have all of the microscopes and tools to hand-paint the solder paste on a few boards. The results looks just as good as production. Seattle and the surrounding area have a lot of assembly options.

QFN is probably the smallest I’ve worked with, though. I stay away from BGA. It’s not like I’m designing cell phones or other mobile, hand-held devices.

Brian


On Mar 13, 2018, at 4:54 AM, jarno.verhoeven at ziggo.nl wrote:
> Seeeeeedstudio does offer cheaper stencils now, keen on giving it a try (especially since I cannot handsolder BCM847bs anymore).
> 
> ------ Origineel bericht------
> Van: Mikko Helin
> 
> QFN soldering by using a hot plate?
> 
> On Tue, Mar 13, 2018 at 1:20 PM, chris <chris at chrismusic.de> wrote:
> Can QFN be hand-soldered without an oven?
> 
> Chris
> 
> On Tue, 13 Mar 2018 11:10:51 +0000 paula at synth.net wrote:
> > Tom,
> >
> >   For me it's a size thing. I mean consider, a VCO, VCF, VCA and ADSR in
> > a 4mm squared package?? I mean you've got a synth voice in such a small
> > space. Small space ! = lower cost and better thermal coupling if you have
> > multiple voices.
> >
> > Paula
> >
> > On 2018-03-13 10:22, Tom Bugs wrote:
> > > Can you expand a bit on that Paula?
> > > I've never really considered them...
> > > Is it mainly a size thing or am I missing something
> > > interesting/important?
> > >
> > >
> > > On 13/03/2018 10:16, paula at synth.net wrote:
> > >> QFNs are awesome.
> > >>
> > >> On 2018-03-13 09:00, Roman Sowa wrote:
> > >>> I've read somewhere that they don't do SOIC for anything greater than
> > >>> 16 pins, but can't remember exact explanation. In general it was in a
> > >>> spirit of "SOIC sucks". In every Alfa QFN chip they say about center
> > >>> pad greatly improving thermal stability.
> > >>>
> > >>> Roman
> > >>>
> > >>> W dniu 2018-03-12 o 22:34, Jay Schwichtenberg pisze:
> > >>>> Wonder why they didn't do the AS3320 as a SOIC. Maybe they didn't
> > >>>> have 18 pin SOIC packages and had QFN packages.
> > >>>>
> > >>>> Jay S.
> > >>>>
> > >>>> *From:*Synth-diy [mailto:synth-diy-bounces at synth-diy.org] *On Behalf
> > >>>> *Sent:* Monday, March 12, 2018 12:27 PM
> > >>>>
> > >>>> Of interest
> > >>>>
> > >>>> http://www.alfarzpp.lv/eng/sc/application.php
> > >>>>