Is this a good transformer for LM 3886?

maurycy · 14th January 2006, 06:26 AM

Hi,

Parts Express has a 25V CT power transformer for sale:

http://www.partsexpress.com/pe/pshow...number=129-035
"This transformer is a filament transformer. The primary is rated at 115V, and the secondary is rated at 25.2V/2.0A."

I was wondering if this trafo would be a good to power LM 3886 stereo amplifier?

Alex

AudioFreak · 14th January 2006, 06:37 AM

No it wouldn't. You really want something that is around 2x18-22V secondaries or 36 - 42V CT.

peranders · 14th January 2006, 06:52 AM

Max voltage (if you have control over the situation) is 2 x 28 V but it's more safe with 2 x 24 V, then you won't have to think and the cooling requirements gets a bit less also.

Peter Daniel · 14th January 2006, 07:00 AM

Quote:

Originally posted by maurycy
Hi,

Parts Express has a 25V CT power transformer for sale:

http://www.partsexpress.com/pe/pshow...number=129-035
"This transformer is a filament transformer. The primary is rated at 115V, and the secondary is rated at 25.2V/2.0A."

I was wondering if this trafo would be a good to power LM 3886 stereo amplifier?

Alex

You will need two of those per channel (one per rail). The voltage is fine.

filgor · 14th January 2006, 07:15 AM

the voltage and current are fine but for 8 ohm minimum loads only.

You will need 4 for a stereo amp.. As Peter said 1 per rail per channel.

neutron7 · 15th January 2006, 01:51 AM

you could get away with it but as peter said you would need 2. for just a bit more than 2 of those you can get a toroid at 100VA (those are 50VA) from apexjr

http://www.apexjr.com/miscellaneous.html

look at the second avel lindburg one in red. i got some, they are nice.
they are center tap so you cant use them with dual rectifier PSU such as audiosector or chipamp.com kits unless you modify them (the transformer) i did it and it worked fine.

i would use 1 per channel, or it will be a bit underpowered. or start with 1 and upgrade when you can afford it.

maurycy · 15th January 2006, 03:03 AM

Thanks guys. I will pass on this trafo then. Chipamp.com is out of stock on the kits anyway. This will give me some time to get toroidal trafo for the right price

Alex

14th January 2006, 06:26 AM	#1
maurycy diyAudio Member Join Date: Dec 2005 Location: NJ	Is this a good transformer for LM 3886? Hi, Parts Express has a 25V CT power transformer for sale: http://www.partsexpress.com/pe/pshow...number=129-035 "This transformer is a filament transformer. The primary is rated at 115V, and the secondary is rated at 25.2V/2.0A." I was wondering if this trafo would be a good to power LM 3886 stereo amplifier? Alex

14th January 2006, 06:37 AM	#2
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	No it wouldn't. You really want something that is around 2x18-22V secondaries or 36 - 42V CT. __________________ - Dan

14th January 2006, 06:52 AM	#3
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Max voltage (if you have control over the situation) is 2 x 28 V but it's more safe with 2 x 24 V, then you won't have to think and the cooling requirements gets a bit less also. __________________ /Per-Anders (my first name) or P-A as my friends call me

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14th January 2006, 07:15 AM	#5
filgor diyAudio Member Join Date: Sep 2004 Location: Sydney	the voltage and current are fine but for 8 ohm minimum loads only. You will need 4 for a stereo amp.. As Peter said 1 per rail per channel.

15th January 2006, 01:51 AM	#6
neutron7 diyAudio Member Join Date: Dec 2003 Location: Toronto Canada	you could get away with it but as peter said you would need 2. for just a bit more than 2 of those you can get a toroid at 100VA (those are 50VA) from apexjr http://www.apexjr.com/miscellaneous.html look at the second avel lindburg one in red. i got some, they are nice. they are center tap so you cant use them with dual rectifier PSU such as audiosector or chipamp.com kits unless you modify them (the transformer) i did it and it worked fine. i would use 1 per channel, or it will be a bit underpowered. or start with 1 and upgrade when you can afford it.

15th January 2006, 03:03 AM	#7
maurycy diyAudio Member Join Date: Dec 2005 Location: NJ	Thanks guys. I will pass on this trafo then. Chipamp.com is out of stock on the kits anyway. This will give me some time to get toroidal trafo for the right price Alex

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