interesting idea :D

h3ad · 6th November 2007, 12:27 PM

hi i have a blown up 5.1 channel receiver that is completely functional except the amplifer is blown (had 2 remove 3 channels to make the amp turn on)
so i am wondering is there and IC amplifer chips i can run on 56-0-56V DC??
thanx

haydn

amc184 · 7th November 2007, 01:34 AM

Not really. There are some more obscure Sanyo ones, but as far as I'm aware, they are hard to get and the performance is fairly poor. If you want to use a 56V power supply for something, have a look at discrete solid state amps, or a LME49810 driving a discrete output stage.

h3ad · 7th November 2007, 02:44 AM

whata bout just using a single rail, and configuring a LM3886 to single rail mode?

amc184 · 7th November 2007, 03:37 AM

Not really a great idea, but you could do it. It adds alot of complexity and addition components, which will degrade the sound quality. You should do one of two things if you want to build an amp out of this supply:
- Use a LME49810 to driver a discrete output.
- Go for a discrete solid state amp.

However, it would be easier and cheaper than both options to just build a new lower voltage power supply and a kitset LM3886 (try chipamp.com). How good is the power supply leftover from this old amp anyway? Post the make and model.

h3ad · 7th November 2007, 08:58 AM

the unit (except the 5ch amp module) is 100% working... all the caps n such r pretty fine
anyway the amp is a Sherwood RD-6405

Ipanema · 12th November 2007, 02:41 AM

You can use step down regulated power supply to reduce 56Vto around 35V so that LM3875/86 can be use. Either discrete or integrated regulator will do.

Regards.

planet10 · 12th November 2007, 03:03 AM

I did something sort of similar... a blown Technics that we stuffed a pr of 3875 chipamps into. The rail voltage is just a bit higher than the max spec. Driving 16 ohm loads this is one of the best GCs i've heard yet.

So if you don't have low impedance speakers, you would not need to throw away as many volts.

dave

h3ad · 12th November 2007, 03:59 AM

i was considering 2 regulate... but then i managed 2 resurect the Left and Right channels of the amp module... i dont think theres any chance anytime soon of fixing the centre channel....

so thnx for your help n suggestions guys

much appreciated

haydn

judtoff · 12th November 2007, 12:42 PM

I ran LM3875s of 42V rails, and they didn't like it. I wouldn't do 56V rails at all. You could use 35V regulators as already suggested. Just make sure they have an adequate heatsink on them

planet10 · 13th November 2007, 12:58 AM

Quote:

Originally posted by judtoff
I ran LM3875s of 42V rails, and they didn't like it.

Interesting. I have one on something like 44V rails and into 16 ohms is one of the best sounding chipAmps i've heard.

dave

6th November 2007, 12:27 PM	#1
h3ad diyAudio Member Join Date: Sep 2007	interesting idea :D hi i have a blown up 5.1 channel receiver that is completely functional except the amplifer is blown (had 2 remove 3 channels to make the amp turn on) so i am wondering is there and IC amplifer chips i can run on 56-0-56V DC?? thanx haydn

12th November 2007, 03:03 AM	#7
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	I did something sort of similar... a blown Technics that we stuffed a pr of 3875 chipamps into. The rail voltage is just a bit higher than the max spec. Driving 16 ohm loads this is one of the best GCs i've heard yet. So if you don't have low impedance speakers, you would not need to throw away as many volts. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

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7th November 2007, 01:34 AM	#2
amc184 diyAudio Member Join Date: May 2007 Location: Christchurch	Not really. There are some more obscure Sanyo ones, but as far as I'm aware, they are hard to get and the performance is fairly poor. If you want to use a 56V power supply for something, have a look at discrete solid state amps, or a LME49810 driving a discrete output stage.

7th November 2007, 02:44 AM	#3
h3ad diyAudio Member Join Date: Sep 2007	whata bout just using a single rail, and configuring a LM3886 to single rail mode?

7th November 2007, 03:37 AM	#4
amc184 diyAudio Member Join Date: May 2007 Location: Christchurch	Not really a great idea, but you could do it. It adds alot of complexity and addition components, which will degrade the sound quality. You should do one of two things if you want to build an amp out of this supply: - Use a LME49810 to driver a discrete output. - Go for a discrete solid state amp. However, it would be easier and cheaper than both options to just build a new lower voltage power supply and a kitset LM3886 (try chipamp.com). How good is the power supply leftover from this old amp anyway? Post the make and model.

7th November 2007, 08:58 AM	#5
h3ad diyAudio Member Join Date: Sep 2007	the unit (except the 5ch amp module) is 100% working... all the caps n such r pretty fine anyway the amp is a Sherwood RD-6405

12th November 2007, 02:41 AM	#6
Ipanema diyAudio Member Join Date: Jun 2004 Location: KL	You can use step down regulated power supply to reduce 56Vto around 35V so that LM3875/86 can be use. Either discrete or integrated regulator will do. Regards.

12th November 2007, 03:59 AM	#8
h3ad diyAudio Member Join Date: Sep 2007	i was considering 2 regulate... but then i managed 2 resurect the Left and Right channels of the amp module... i dont think theres any chance anytime soon of fixing the centre channel.... so thnx for your help n suggestions guys much appreciated haydn

12th November 2007, 12:42 PM	#9
judtoff diyAudio Member Join Date: Jul 2005 Location: Goderich	I ran LM3875s of 42V rails, and they didn't like it. I wouldn't do 56V rails at all. You could use 35V regulators as already suggested. Just make sure they have an adequate heatsink on them

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