transformer question

jp88 · 15th April 2006, 04:54 PM

I am planning on building a 3886 gainclone. I found a transformer I think may work. It came out of a phillips integrated system with a cd player, tpe deck and tuner. The amp was rated at 100 x 2 The transformer while hooked up in the unit measured abou 45 vac from each side to the center tap. Does this sound like it will work?

Primoz · 15th April 2006, 11:44 PM

Maximum voltage for LM3886 is 2x42Vdc

After rectifying with diodes and capacitors the DC voltage is 1.414 * AC voltage. In your case you would get around 2x 65V, which would destroy your chips

You need transformer with voltage 2x28V or less. I think the best choice is 2x24V

jp88 · 16th April 2006, 01:00 AM

how about if I paralleled the secondaries and didnt have a center tap? can this be done with briangt or peterdaniels power supply boards? This would give me 45vac total.

Frosty · 16th April 2006, 11:35 AM

hi this would work, only if u convert your amp module to work of a single supply rail. The best option would be to buy a rated transformer at 2x24V and use the 2x45 vac transformer for a future high power amp project

15th April 2006, 04:54 PM	#1
jp88 diyAudio Member Join Date: Mar 2004 Location: NC	transformer question I am planning on building a 3886 gainclone. I found a transformer I think may work. It came out of a phillips integrated system with a cd player, tpe deck and tuner. The amp was rated at 100 x 2 The transformer while hooked up in the unit measured abou 45 vac from each side to the center tap. Does this sound like it will work? __________________ WHAT ____________

16th April 2006, 01:00 AM	#3
jp88 diyAudio Member Join Date: Mar 2004 Location: NC	how about if I paralleled the secondaries and didnt have a center tap? can this be done with briangt or peterdaniels power supply boards? This would give me 45vac total. __________________ WHAT ____________

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15th April 2006, 11:44 PM	#2
Primoz diyAudio Member Join Date: Mar 2003 Location: Slovenia	Maximum voltage for LM3886 is 2x42Vdc After rectifying with diodes and capacitors the DC voltage is 1.414 * AC voltage. In your case you would get around 2x 65V, which would destroy your chips You need transformer with voltage 2x28V or less. I think the best choice is 2x24V

16th April 2006, 11:35 AM	#4
Frosty diyAudio Member Join Date: Apr 2006 Location: sydney	hi this would work, only if u convert your amp module to work of a single supply rail. The best option would be to buy a rated transformer at 2x24V and use the 2x45 vac transformer for a future high power amp project

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