[sdiy] Latvian CEM Synth IC clones

Alexandre Souza alexandre.tabajara at gmail.com
Wed Mar 14 12:39:09 CET 2018


$300 for a stencil? O_O
www.pcbshopper.com
In www.jlcpcb.com I do stencils for $9
O_O


2018-03-14 8:33 GMT-03:00 <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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>>
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