[sdiy] Latvian CEM Synth IC clones

[Jay Schwichtenberg]

To me it seems like chips running at 50C-60C is way too hot and something is wrong. I'd expect to see something like a voltage regulator dropping a lot of voltage under a decent load doing that.

 

Are you driving low impedance loads or something?

 

Jay S.

 

From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Mattias Rickardsson
Sent: Monday, March 19, 2018 7:10 AM
To: mark verbos
Cc: synth-diy at synth-diy.org
Subject: Re: [sdiy] Latvian CEM Synth IC clones

 

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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