3886 single sided pcb, suggestions please

jshaw001 · 27th April 2006, 02:13 AM

Hello all,
I was trying to throw together a 3886 single sided PCB I got one built and it had a case of the hums, what's worse is I had no huming when I had it on the breadboard, how annoying. A little redesign later and I've got this. I was wondering if anyone could give me some sugestions. Nothing special going on. It's pretty much just the reference design. I'm cheap but open to suggestions.
thanks!
--Jason

Leolabs · 28th April 2006, 01:12 AM

Wondering how are your grounds connected together???

ifrythings · 28th April 2006, 05:11 AM

Quote:

Originally posted by Leolabs
Wondering how are your grounds connected together???

Agreed^, You have some ground problems and a missing point for the speaker ground.

jshaw001 · 28th April 2006, 10:14 AM

well I'm kind of new at this so what I did is I decided to keep the two grounds separate and run a wire for each one. Is this a bad idea? I just ran the grounds to a star ground.
I ended up modifying a bit before I actually built one. I changed the 100uf caps to 1000uf and widened the space between the 1000uf and the .1uf caps, plus a little other clean ups. I built one and it seems to be working fine to me, I even ran it through a 12 inch sub I had laying around it worked fine to me. Now I suppose does anyone of you gainclone gurus have a beef with this design?
--Jason

XELB · 28th April 2006, 02:08 PM

You should pay attention to the NC (No Connection) pins.

Can you upload the Schematic ? It seems strange

28th April 2006, 02:08 PM	#5
XELB diyAudio Member Join Date: Dec 2004 Location: Lisboa	You should pay attention to the NC (No Connection) pins. Can you upload the Schematic ? It seems strange __________________ If you want power you must add control

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28th April 2006, 01:12 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	Wondering how are your grounds connected together???

28th April 2006, 10:14 AM	#4
jshaw001 diyAudio Member Join Date: Jul 2005 Location: Iowa	well I'm kind of new at this so what I did is I decided to keep the two grounds separate and run a wire for each one. Is this a bad idea? I just ran the grounds to a star ground. I ended up modifying a bit before I actually built one. I changed the 100uf caps to 1000uf and widened the space between the 1000uf and the .1uf caps, plus a little other clean ups. I built one and it seems to be working fine to me, I even ran it through a 12 inch sub I had laying around it worked fine to me. Now I suppose does anyone of you gainclone gurus have a beef with this design? --Jason

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