dc at output

jaudio · 14th December 2004, 07:03 PM

I built a parallel bridged amp with 8 lm3886 I measured the voltage at the output Im getting 3volt dc and 32volt ac when the amp in wide open. Is the normal

wxn · 14th December 2004, 07:39 PM

No.

demogorgon · 14th December 2004, 08:25 PM

time to go over the amp with your multimeter and check every solder joint and wire in the amp.

do you have a dc servo in your amp considering you have so many chips?

marius

janneman · 14th December 2004, 08:30 PM

I got you Marius:

Your sig relates to the winter season when most of you put on your skis and take off into the wilderness!
Of course there are no toilets, and you will find places where the snow has a golden color!!
Hence, the proverb says - directly translated: Cook never coffee on yellow snow!,
or better: Never make your coffee based on water from yellow snow! As a proverb, absolutely NOT dirty! The coffee on the other hand ......!

Jan Didden

janneman · 14th December 2004, 08:32 PM

Quote:

Originally posted by jaudio
I built a parallel bridged amp with 8 lm3886 I measured the voltage at the output Im getting 3volt dc and 32volt ac when the amp in wide open. Is the normal

You must tell us a bit more. Post a schematic diagram. What do you mean with "the amp is wide open"? Have you measured with the input shorted? If not, do that first.

Jan Didden

demogorgon · 14th December 2004, 08:48 PM

Quote:

Originally posted by janneman
I got you Marius:

Your sig relates to the winter season when most of you put on your skis and take off into the wilderness!
Of course there are no toilets, and you will find places where the snow has a golden color!!
Hence, the proverb says - directly translated: Cook never coffee on yellow snow!,
or better: Never make your coffee based on water from yellow snow! As a proverb, absolutely NOT dirty! The coffee on the other hand ......!

Jan Didden

DAMN!

you spoiled the fun for me now!! I'l have to come up with something new now i guess.. but tell me.. who's your inside source?

ontopic: yes, post schematics. that always helps.

janneman · 14th December 2004, 09:08 PM

Quote:

Originally posted by demogorgon
[snip]but tell me.. who's your inside source?
[snip]

My boss, actually. Retired Norwegian Army general. He loved it!

Jan Didden

jaudio · 14th December 2004, 11:12 PM

what i mean by "wide open" is the volume control is turn completely to the right. I used the classic inverted design and there is no servo just trimmer at +input

carlosfm · 14th December 2004, 11:46 PM

Quote:

Originally posted by jaudio
what i mean by "wide open" is the volume control is turn completely to the right. I used the classic inverted design and there is no servo just trimmer at +input

Use an input buffer, after the pot.

peranders · 15th December 2004, 09:51 AM

Quote:

Originally posted by janneman

Your sig relates to the winter season when most of you put on your skis and take off into the wilderness!
Of course there are no toilets, and you will find places where the snow has a golden color!!

Jan, you are smart. I didn't get that despite it's spelled out in clear for me.

"Koka aldrig kaffe på gul snö" in swedish. Sometimes you are slow....

Jan, what about my sig at the bottom?

14th December 2004, 07:03 PM	#1
jaudio diyAudio Member Join Date: Oct 2004	dc at output I built a parallel bridged amp with 8 lm3886 I measured the voltage at the output Im getting 3volt dc and 32volt ac when the amp in wide open. Is the normal

14th December 2004, 07:39 PM	#2
wxn diyAudio Member Join Date: Sep 2003 Location: Vilnius	No. __________________ Nothing is as simple as it seems

14th December 2004, 08:30 PM	#4
janneman diyAudio Member Join Date: May 2002 Location: Where Germany, The Netherlands and Belgium meet Blog Entries: 6	I got you Marius: Your sig relates to the winter season when most of you put on your skis and take off into the wilderness! Of course there are no toilets, and you will find places where the snow has a golden color!! Hence, the proverb says - directly translated: Cook never coffee on yellow snow!, or better: Never make your coffee based on water from yellow snow! As a proverb, absolutely NOT dirty! The coffee on the other hand ......! Jan Didden __________________ /New Linear Audio publication: Baxandall & Self on Audio Power!

14th December 2004, 11:12 PM	#8
jaudio diyAudio Member Join Date: Oct 2004	dc at output what i mean by "wide open" is the volume control is turn completely to the right. I used the classic inverted design and there is no servo just trimmer at +input

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14th December 2004, 08:25 PM	#3
demogorgon diyAudio Member Join Date: Jul 2004 Location: Behind you.	time to go over the amp with your multimeter and check every solder joint and wire in the amp. do you have a dc servo in your amp considering you have so many chips? marius

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