the best transformer rail voltages for gainclone?

araven · 30th September 2006, 03:03 PM

Hi,

I'm currently building a gainclone using a LM4780, and was wondering what the best transformer spec would be?

I like the look of the THD+N graphs (and other graphs) when using 35v and 8ohm speakers. The problem is, i want the amp to be flexible and i can't gaurantee that I won't use speakers with a lower impedance at some point.

Also, what's a good power rating to use? At a guess i would assume a minimum of about 200VA.

Thanks,
Andy

araven · 30th September 2006, 03:08 PM

Forgot to mention, I currently already have 2 suitable toroids in my spares box to choose from.

1. 22v 225VA (which should deliver about 31v after rectification under load)
2. 25v 300VA ( 34.5v after rectification under load)

Thanks,
Andy

jaycee · 30th September 2006, 10:31 PM

Either would do, really. I'd go with the 25V 300VA unit, just make sure you dont crank it when used with 4 ohms

30th September 2006, 03:03 PM	#1
araven diyAudio Member Join Date: Aug 2006	the best transformer rail voltages for gainclone? Hi, I'm currently building a gainclone using a LM4780, and was wondering what the best transformer spec would be? I like the look of the THD+N graphs (and other graphs) when using 35v and 8ohm speakers. The problem is, i want the amp to be flexible and i can't gaurantee that I won't use speakers with a lower impedance at some point. Also, what's a good power rating to use? At a guess i would assume a minimum of about 200VA. Thanks, Andy

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
modern day rail voltages	Clipped	Car Audio	3	28th September 2007 04:38 AM
Rail voltages from 15-0-15 volt transformer	Bama Slamma	Power Supplies	3	26th November 2006 10:27 AM
bosoz rail voltages	EANDERS	Pass Labs	2	25th March 2005 04:19 PM
Amp supply rail voltages....	Xicarius	Everything Else	2	4th August 2004 12:38 AM
help with rail voltages	Svetlana	Pass Labs	11	24th June 2004 09:35 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

30th September 2006, 03:08 PM	#2
araven diyAudio Member Join Date: Aug 2006	Forgot to mention, I currently already have 2 suitable toroids in my spares box to choose from. 1. 22v 225VA (which should deliver about 31v after rectification under load) 2. 25v 300VA ( 34.5v after rectification under load) Thanks, Andy

30th September 2006, 10:31 PM	#3
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	Either would do, really. I'd go with the 25V 300VA unit, just make sure you dont crank it when used with 4 ohms

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)