[sdiy] Latvian CEM Synth IC clones

[mark verbos]

Sorry if this is a stupid question, but when does it start to be an issue that the parts are too small. I mean in terms of current capacity and such. I use 0603 resistors and they are only 100mW at some point it starts to be an issue for analog circuits, right? Not that I really want to use 01005 passives anyway, but my pick ’n' place is supposed to be able to. They look like salt and pepper.

Mark



> On Mar 13, 2018, at 9:49 PM, rsdio at audiobanshee.com wrote:
> 
> 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
>>>>>>> 
> 
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