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Old 26th March 2011, 01:00 PM   #1391
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Default power supply question

hey miles aka apexaudio, i want to use 40-0-40 transformer, how much ampere rating i should use for the transformer @ 2 ohms load and how much rms power it can deliver using this transfomer.

im expecting a rating 600w @ 2 ohms but not sure how much transformer amperes i should use. thanks
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Old 26th March 2011, 01:44 PM   #1392
viki_v2 is offline viki_v2  India
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Hello,
I completed one channel of B500 Today,
Psu 37-0-37 3 Amperes.
Dc at out is 35mv.

The sound is very low, and very distorted.
I made connections as shown by mile.
Kindly Guide.
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Old 26th March 2011, 01:46 PM   #1393
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Quote:
Originally Posted by viki_v2 View Post
Hello,
I completed one channel of B500 Today,
Psu 37-0-37 3 Amperes.
Dc at out is 35mv.

The sound is very low, and very distorted.
I made connections as shown by mile.
Kindly Guide.
Did you connect input ground to psu? if not connect it
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Old 26th March 2011, 02:00 PM   #1394
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by jalou1995 View Post
want to use 40-0-40 transformer, how much ampere rating i should use for the transformer @ 2 ohms load ................ expecting a rating 600w @ 2 ohms but not sure how much transformer amperes
The usual and best advice for selecting a transformer for an audio power amp is that the VA should be between one times the maximum power rating and two times the maximum power rating.
For 600W of maximum output power, you can use a 600VA to 1200VA transformer.
The amplifier will work if the transformer is smaller than 600VA and it will also work if the transformer is over 1200VA. Buy what you can afford and do ask what the regulation is. The lower the regulation, the "better" the transformer. The voltage sags less when the amp is asked to deliver current to the load.
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regards Andrew T.
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Old 26th March 2011, 02:18 PM   #1395
viki_v2 is offline viki_v2  India
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Originally Posted by irvynejay View Post
Did you connect input ground to psu? if not connect it
Yes i did while testing.
Input gnd connected to psu gnd.
output gnd connected to psu gnd.
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Old 26th March 2011, 05:20 PM   #1396
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Quote:
Originally Posted by AndrewT View Post
The usual and best advice for selecting a transformer for an audio power amp is that the VA should be between one times the maximum power rating and two times the maximum power rating.
For 600W of maximum output power, you can use a 600VA to 1200VA transformer.
The amplifier will work if the transformer is smaller than 600VA and it will also work if the transformer is over 1200VA. Buy what you can afford and do ask what the regulation is. The lower the regulation, the "better" the transformer. The voltage sags less when the amp is asked to deliver current to the load.
thanks andrew, do i need to add a few more trannies in this circuit so that it can handle loads @ 2 ohms?

theres a reason for me wanting to do this, i want to bridge this amp so that it can drive two subs rated 500w @ 8 ohms each using 40-0-40 VAC trasfo. In theory, if this amp can handle 600w @ 2ohms, bridging the amp could provide (fingers crossed) 1200w @ 4 ohms.
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Old 26th March 2011, 06:31 PM   #1397
bud17 is offline bud17  Indonesia
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I have transformer 10A secondary voltage 45-0-45 (VAC) or 63-0-63 (VDC).
How many pair of output?

Thankyou.
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Old 26th March 2011, 11:21 PM   #1398
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viki,
copper side must be clean,use acetone or laquer thinner and please make continuity check copper side mostly transistor pinning make shure nothing is shorted better remove all those flux.
and better find mylar caps instead of ceramic 100nf 47nf 100v
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Old 27th March 2011, 06:31 AM   #1399
viki_v2 is offline viki_v2  India
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I am using low power transformer , could that be the reason.
I have checked the tracks continuity, Its fine.
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Old 27th March 2011, 06:35 AM   #1400
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Quote:
Originally Posted by engel dela pena View Post
viki,
copper side must be clean,use acetone or laquer thinner and please make continuity check copper side mostly transistor pinning make shure nothing is shorted better remove all those flux.
and better find mylar caps instead of ceramic 100nf 47nf 100v
to add pre: check for cold solders and transistor pins and shorts.
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