[sdiy] Latvian CEM Synth IC clones

[oren levy]

The fun comes in when dealing with leakage across 01005 resistors > 220kohms. That was fun to learn about in a proto build at work. 

Rock & Roll,
Oren Levy

> On Mar 19, 2018, at 07:10, Mattias Rickardsson <mr at analogue.org> wrote:
> 
>> On 14 March 2018 at 11:50, mark verbos <markverbos at gmail.com> 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.
> 
> One problem resulting from the tinyfication of everything is that the temperature gets higher when many ICs are packed into a small PCB area. My VCAs are running at over 50 degrees C here on the bench. The op-amps are approaching 60 degrees. When something reaches 180 degrees, we have an uncool audio fatality. ;-)
> 
>> 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.
> 
> Surface-mount resistors with larger physical size typically have a bit lower excess noise and distortion. Size matters also among capacitors to some degrees. For some designs this can be important.
> 
> The ability to probe your ICs without shorting things is a good goal. With quad op-amps (outputs on the corner pins) TTSOP is fine, but otherwise I prefer the huge SOIC to reduce the risks.
> 
> /mr
> 
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