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Old 12th November 2012, 03:36 PM   #711
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Default pcb board?

Hi, I picked up a gainclone amp... Just need the power supply section for it. I've got the transformer for it. I was hoping someone had a spare chip amp power supply board?

I've also got some mur860 I believe. If I can't get my hands on a psb board I'll build a minimal power supply with just the murs.
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Old 20th December 2012, 03:58 PM   #712
BIA is offline BIA
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Default Transformer ?

I have a Toroidal Transformer from a high powered LED gun . the secondary winding is 21vac (actual 26vac) no center tap , is it possible to use this for my pre-amp build , could i create a 0vac ?

Comments and pictures please . :-)
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Old 20th December 2012, 04:51 PM   #713
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Quote:
Originally Posted by merlin2069er View Post
Hi, I picked up a gainclone amp... Just need the power supply section for it. I've got the transformer for it. I was hoping someone had a spare chip amp power supply board?
The DIY Audio Store board will certainly work well:
Universal PSU, Capacitor and Diode Combination Board (Pre-scored and easy to snap into sections) - PCBs
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Old 30th November 2013, 11:40 AM   #714
sonyzz is offline sonyzz  Lithuania
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is toroidal transformer 2x24v 200VA be good with 2x10000uf 63v cap's in power supply for tda7293 at 4ohms load? in datasheet is specified that at 4ohms load - 29v is max voltage. so what voltage of traansformer is needed that after two 10000uF caps it not exeed 27-29v?
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Old 1st December 2013, 07:38 AM   #715
AndrewT is offline AndrewT  Scotland
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22+22Vac or 20+20Vac for <29Vdc

Why 63V smoothing capacitors?
Do your plan to upgrade to 150W into 8ohms?
35V or 50V capacitors will do for a PSU giving <29Vdc
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Old 1st December 2013, 08:23 AM   #716
sonyzz is offline sonyzz  Lithuania
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Quote:
Originally Posted by AndrewT View Post
22+22Vac or 20+20Vac for <29Vdc

Why 63V smoothing capacitors?
Do your plan to upgrade to 150W into 8ohms?
35V or 50V capacitors will do for a PSU giving <29Vdc
cant find transformers with these voltages only find 17+17AC 200w or mostly 24+24Ac will tda survive if i choose 24+24Vac transformer?about power i know for one chip - 150w is needed atleast so 200w transformer do good job with single chip
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Old 1st December 2013, 12:25 PM   #717
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Doc doesn't say 29V is the max. It is an example. You can give up to +-40V supply to it. It will only generate more heat. 24V should be just fine.
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Old 1st December 2013, 12:49 PM   #718
sonyzz is offline sonyzz  Lithuania
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Originally Posted by mrWagner View Post
Doc doesn't say 29V is the max. It is an example. You can give up to +-40V supply to it. It will only generate more heat. 24V should be just fine.
thanks and as i seen in one person's video on youtube he's using two tda7294 at 4 ohms load and in comments he says that the transformer he is using is 2x24V AC and then in video is shown 59V DC after two 10000uf caps so 2x29,5DC after caps i think its fine because he played music trough he's amp
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Old 9th December 2013, 06:01 AM   #719
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Default Transformer with 4 Outputs?

Total newb here, what do you guys think of this transformer?

500VA Toroidal Power Transformer.
4 Outputs: 26.52VCT; 40.00V x 2; 8.01V.

The extra outputs are ok not being used correct and 40V isn't too high right?
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Old 9th December 2013, 10:44 AM   #720
AndrewT is offline AndrewT  Scotland
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40Vac is far too high for a dual polarity supply.
26.52Vac centre tapped is very low.
What are the current rating of the four windings?

Wrong transformer for a chip amp?
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