SYMEF amplifier
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 15th May 2012, 10:17 AM #491 Tekko Banned   Join Date: Jan 2005 I've been informed that 2x50VDC is the max this amp is designed for.
 15th May 2012, 10:53 AM #492 drowranger diyAudio Member   Join Date: Aug 2009 suggested supply is 40v. Oooooh.....yes! I have made torture test using 2x 6.5 inches of speaker with a total impedance of 6ohms.mind you again, that the impedance that makes the amplifier put into stress and not the size..... regards, joel p.s. when I said 40v that is D.C. rail supply. Last edited by drowranger; 15th May 2012 at 11:04 AM.
 15th May 2012, 12:15 PM #493 nakamoomin   diyAudio Member   Join Date: Jun 2009 Thanks Tekko. 30-0-30 will probably not reach 50V unloaded so I'll assume it's safe. What about rating? In my book 250VA per ch. should be around the sweetspot for this amp (150W out), but I know there are a lot of opinions around PSUs.
 15th May 2012, 12:45 PM #494 drowranger diyAudio Member   Join Date: Aug 2009 computation... 30v x 1.4 -1 =41volts DC regards, joel
nakamoomin
diyAudio Member

Join Date: Jun 2009
Quote:
 Originally Posted by drowranger 30v x 1.4 -1 = 41volts DC regards, joel
I think that's the same equation I used on the previous page..
So that looks correct to me.

I was under the impression that the Voltage numbers (eg. 30-0-30) are given @ the specified rating (eg. 300VA), and that sometimes idle voltage can be a little higher (to account for resistance in the coil) Vunloaded = Vloaded + I*Rc.

Quality toroids will use nice thick wire and have very low Resistance, but a few volts can be expected (depending on rating).

Am I wrong?

 15th May 2012, 03:53 PM #496 AndrewT   diyAudio Member   Join Date: Jul 2004 Location: Scottish Borders The maximum DC voltage from a 230:30+30Vac 200VA transformer with 7% regulation used in the UK is: 254/230*30*sqrt(2)*1.07 - 0.5 ~ +-49.6Vdc __________________ regards Andrew T.
 15th May 2012, 05:20 PM #497 OnAudio diyAudio Member   Join Date: Oct 2011 @ Digger This is much better Antek - AN-5230. I know someone using +/- 60VDC with 8 ohm load however I like a large safety margin. +/- 40VDC to +/- 50VDC keeps you safe and helps the amplifier drip honey all the way. @ Alex. Great progress
 15th May 2012, 08:02 PM #498 c12mech   diyAudio Member     Join Date: Jun 2009 Location: Indiana I was going to ask about the transistor listed that is obsolete but I see that has been answered. What about the coil. There is no pn on the BOM. Where is this sourced. Thanks, Bryant
 15th May 2012, 08:07 PM #499 Tekko Banned   Join Date: Jan 2005 you wind it yourself out of magnet wire.
 15th May 2012, 09:50 PM #500 OnAudio diyAudio Member   Join Date: Oct 2011 Hi, c12mech Check post #246 SYMEF amplifier

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