Symasym - the sequel

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#281
Hi Colescuttle,
Welcome to a Symasym thread. There are three that I know of. There is one on troubleshooting and the original thread also. You are more than welcome to ask questions.

My opinion is that you should attempt to build the 5.3 on Mike's and Pavel's web pages. There is an awful lot of knowledge on these. They do tend to go together without too much trouble. They sound very good.

My advice would be to avoid ceramic capacitors, use mica, polypropylene or polystyrene (sensitive to heat when soldering).

No need to head your posts with “DUMMY WARNING!”. I hope this is a positive experience for you.

-Chris 😉
 
#285
jaycee said:
Two reasons.

One is that the acid can etch under the pads. This can lead to the pads coming off when you heat them up to solder them. Admittedly, this is only likely if you leave it in the acid too long.

Two, and the more importan one, is that if you don't drill exactly where the hole is etched, you end up with a hole, and part of the pad with no copper on to attach to. If you leave the pad filled, then the hole is wherever you drill it, so if you're a bit off, it wont affect solderability.
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Eagle comes with a nice ULP called "drill aid". It generates a seperate Layer with pads filling the original drill holes, but leaving a very small (adjustable) hole. Set to 0,3 mm (default), it gives a perfect drill centering without any danger. Won't live without this any more.
 
#287
Hi t.,
Actually, I built some only to use for some in wall speakers.

They turned out better than I thought and now I'm experimenting with them, as many other people are. It's a surprising little amplifier. Once I build more I will install them in the intended application.

-Chris
 
#289
anatech said:
Hi t.,
Actually, I built some only to use for some in wall speakers.

They turned out better than I thought and now I'm experimenting with them, as many other people are. It's a surprising little amplifier. Once I build more I will install them in the intended application.

-Chris
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Thanks Chris
Its just when you have a pile of amps already you think is it worth building one more incase this is better🙂 If I have the parts I may just give it a go anyway
 
#290
Re: Re: Thanks.

pinkmouse said:


George, I have a personal motto: "Regret nothing". You learn from everything, even if it goes horribly wrong.
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"Folk dancing" ain't so bad when you are with the right women. 😉 I think it depends on your roots.

BTW, where is the "pink" version of the Sym Higher Power PCB? It looked like a reality just a few post past?

Shawn.
 
#294
Hi George,
I avoid tantalums like the plague. Use electrolytics for filtering. There are positions on the board for film caps for bypassing. Use film or mica for anything in the signal path except the feedback to ground connection. It's bypassed as well.

Tantalums are tiny little time bombs, and they sound bad anyway. Give them to someone you don't like! :devilr:

-Chris
 
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