what to do with +-42V and 320VA trafo?

kmj · 11th April 2005, 11:48 AM

I got a couple of transformers collecting dust, do you guys have some idéas of what to do with them?

the first one is a toroid with 2x+-40V rectified and 320VA and the others are an identical pair of +-42V and 160VA.
I also have 4x10000uF (63V) and 4x2200uF (80V) electrolytic capacitors.

one alternative is the hypex ucd180 but is there some other alternatives?

shusha · 11th April 2005, 02:58 PM

You can build nice solid state amp, but also nice chipamp with regulated power supply. Look at Carlos improved LM3886. Use LM338 voltage regulator to drop the voltage.

lgreen · 14th April 2005, 07:59 AM

Yes, you can easily make a chipamp using a regulated power supply. Use two LM338 voltage regulators to create a plus and minus 35 volts or so, and then use an LM3886 (check same site) to make yourself a nice amplifier. You are posting on chipamp forum, its all the rage.

kmj · 14th April 2005, 10:06 AM

Lm3885?
I have an amp based on lm3875 and soon a hypex ucd180.

But since I have 2 sets of transformers it would be a shame to let them go to waist, wouldn't it?

Perhaps wrong part of the forum but are there some transistorbased alternatives?

The major problem when choosing amp is the fact that my speakers like atleast around 100W/channel

(bookshelf, 83-85db sensitivity)

paulb · 14th April 2005, 11:38 AM

Quote:

Originally posted by kmj
the first one is a toroid with 2x+-40V rectified and 320VA and the others are an identical pair of +-42V and 160VA.

Quote:

Originally posted by kmj
But since I have 2 sets of transformers it would be a shame to let them go to waist, wouldn't it? The major problem when choosing amp is the fact that my speakers like atleast around 100W/channel(bookshelf, 83-85db sensitivity)

Project 68 at www.sound.au.com

kmj · 15th April 2005, 09:53 AM

Quote:

Look at Carlos improved LM3886

do you have a link?
there's quite a lot of treads regarding carlos+ lm3886

edit:
or even better, a link to the amp and supply schematics

jaudio · 15th April 2005, 10:03 AM

try tda7293 or 7294

11th April 2005, 11:48 AM	#1
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	what to do with +-42V and 320VA trafo? I got a couple of transformers collecting dust, do you guys have some idéas of what to do with them? the first one is a toroid with 2x+-40V rectified and 320VA and the others are an identical pair of +-42V and 160VA. I also have 4x10000uF (63V) and 4x2200uF (80V) electrolytic capacitors. one alternative is the hypex ucd180 but is there some other alternatives?

14th April 2005, 07:59 AM	#3
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	make a chipamp Yes, you can easily make a chipamp using a regulated power supply. Use two LM338 voltage regulators to create a plus and minus 35 volts or so, and then use an LM3886 (check same site) to make yourself a nice amplifier. You are posting on chipamp forum, its all the rage.

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11th April 2005, 02:58 PM	#2
shusha diyAudio Member Join Date: Sep 2004 Location: Velika Gorica	You can build nice solid state amp, but also nice chipamp with regulated power supply. Look at Carlos improved LM3886. Use LM338 voltage regulator to drop the voltage.

14th April 2005, 10:06 AM	#4
kmj diyAudio Member Join Date: Feb 2004 Location: Falkenberg	Lm3885? I have an amp based on lm3875 and soon a hypex ucd180. But since I have 2 sets of transformers it would be a shame to let them go to waist, wouldn't it? Perhaps wrong part of the forum but are there some transistorbased alternatives? The major problem when choosing amp is the fact that my speakers like atleast around 100W/channel (bookshelf, 83-85db sensitivity)

15th April 2005, 10:03 AM	#7
jaudio diyAudio Member Join Date: Oct 2004	try tda7293 or 7294

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