[sdiy] Latvian CEM Synth IC clones

[paula at synth.net]

I guess it depends on what you're doing.
For a lot of synth stuff it tends to be low power, but for where you 
need power you could go bigger, a current design at work uses 0201 for 
things like pull ups and decoupling, 0402 for the majority (lots of 
options in values) and we have a couple of 0.5W 0805 resistors (0.1 ohms 
and 0.07 ohms).. So for me it's a case of I'll go for as small as I'm 
able :)

On 2018-03-14 10:50, mark verbos wrote:
> 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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