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Old 26th February 2009, 03:58 PM   #251
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checked everything again using an getter GND reference (the last time contact was not good).

Now i get

LM3886 +34V / -34V
LM318 +12,2V / -12,2V


i was thinking if to check the relays i can direct connect the output of the zeners to the relay to check if work. What do you think?

attached the picture http://www.compurosario.com.ar/_diyaudio/GC_03.jpg
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Old 26th February 2009, 04:24 PM   #252
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connected the relay in paralel with the working board and the relay workrs, so is not an Relay problem
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Old 26th February 2009, 04:27 PM   #253
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So looks like the problem are in the speaker protection circuit

will replace all the Transistors to see if it fixed it.
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Old 26th February 2009, 04:36 PM   #254
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2 blacks and a grey center tap. What is the AC voltage of the secondaries?

Looks right but small trafo.

Chip NEEDS to be heat sinked if pwred up. No ands if or buts. Pwr on without and spike will kick in.

Now I am going make lunch then I will examine the pics you posted.
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Old 26th February 2009, 05:38 PM   #255
troystg is offline troystg  United States
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Quote:
Originally posted by samsagaz
Here i post the pictures, hope the quality will be enough

editing the pics because are too big

http://www.compurosario.com.ar/_diyaudio/GC_01.jpg

http://www.compurosario.com.ar/_diyaudio/GC_02.jpg

dont, removed the image tag because images are too big, and dont know how to disply it as thumbs

In the first picture you have here, is that "the" working PCB or one of the "broken" ones?

And please email me directly..

troystg @ gmail.com
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Old 26th February 2009, 10:13 PM   #256
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Quote:
Originally posted by madisonears
Do the C9 Elna's fit onto the board without too much trouble? It's hard to tell their relative size from your photo. They look to be similar size to the FM's.

Have you decided on a C13? I put a 1.5uf Bennic metalized poly cap in there, and it sounds a bit dull with loose bass. I have some other caps on order now.
Hi Tom,

I've attached a photo of a Silmic in C9 place. It's a tight fit, particularly with C13, if necessary C21 could be mounted in the bottom side.

For C13 I'll start soon too the search for a good one, but for now modules are DC coupled.
Attached Images
File Type: jpg imgp3429.jpg (91.3 KB, 555 views)
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Old 27th February 2009, 01:48 AM   #257
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Quote:
Originally posted by troystg
2 blacks and a grey center tap. What is the AC voltage of the secondaries?

Looks right but small trafo.

Chip NEEDS to be heat sinked if pwred up. No ands if or buts. Pwr on without and spike will kick in.

Now I am going make lunch then I will examine the pics you posted.
AC are 24V.

The trafo are small just 100VA, but for testing or low volume will be OK.

the chips works OK, the only problem is in the protection circuit, the Relay dont engage.
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Old 27th February 2009, 02:03 AM   #258
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What Happend if i use BC546C (with much more hfe value) than BC546A?
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Old 27th February 2009, 03:06 AM   #259
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Question LM3886

A question about soldering the 3886: most of the pads where the LM3886 pins sit are oval shaped "normal" pads. But, three of the pads aren't really pads they're just through-holes. Are we supposed to solder the leads to those or do the leads "float?"

I know they shouldn't float. So, are they soldered or cut off?
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Old 27th February 2009, 03:10 AM   #260
schro20 is offline schro20  United States
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Default Re: LM3886

Quote:
Originally posted by marc brown
A question about soldering the 3886: most of the pads where the LM3886 pins sit are oval shaped "normal" pads. But, three of the pads aren't really pads they're just through-holes. Are we supposed to solder the leads to those or do the leads "float?"
I don't know what the official answer is, but I soldered all of them and it works as expected. See the close-ups in http://picasaweb.google.com/schro20/...OfRevCFromKit#

peter
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