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Old 15th May 2012, 09:17 AM   #491
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I've been informed that 2x50VDC is the max this amp is designed for.
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Old 15th May 2012, 09:53 AM   #492
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Default 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 10:04 AM.
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Old 15th May 2012, 11:15 AM   #493
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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.
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Old 15th May 2012, 11:45 AM   #494
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Default computation...

30v x 1.4 -1 =41volts DC

regards,
joel
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Old 15th May 2012, 12:49 PM   #495
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Quote:
Originally Posted by drowranger View Post
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?
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Old 15th May 2012, 02:53 PM   #496
AndrewT is offline AndrewT  Scotland
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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
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regards Andrew T.
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Old 15th May 2012, 04:20 PM   #497
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@ 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
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Old 15th May 2012, 07:02 PM   #498
c12mech is offline c12mech  United States
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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
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Old 15th May 2012, 07:07 PM   #499
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you wind it yourself out of magnet wire.
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Old 15th May 2012, 08:50 PM   #500
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Hi, c12mech

Check post #246
SYMEF amplifier
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