Electronics > Beginners
smd resistor in power audio amplifiers
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mariush:
I personally don't like those to-92 packages... hope you replace those with something better. Difficult to passively cool..
Maybe replace with sot-23 or sot-223 ?

You should probably make the footprints 0805 but extend them to accept 1206 as well. 0805 is probably cheaper as it's more common.

It still leaves you enough room to get a trace between the pads, so you may want to consider 0 ohm resistos / jumper links to simplify your layout, if needed.


exe:

--- Quote from: mrjoda on October 29, 2019, 08:00:20 pm ---I choose 1206 because footprint is very similar to MELF so there is posibility to use MELFs. Lets see.

--- End quote ---

Interesting, why do you want to use melfs? 1206 seems to be quite a big footprint, just by mounting TH resistors vertically you may get a similar density.  I'd say 0603 is a sweet spot. Or 0805, if it needs to be beginner-friendly.
dmills:
1206 has more thermal mass (clearly) then the smaller parts, which makes for less low frequency distortion due to the heating at twice the input frequency.
It is small, but is a real thing.

MELF are sometimes preferred for much the same reason, but for me 0805 or 1206 thin film generally get it done, MELF is just such a pain in the arse and frankly well into audophoolery tweaksville.

Regards, Dan.
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