Which class D amp for a 100W +/-28VDC power supply ? - diyAudio
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Old 29th August 2009, 09:42 AM   #1
00940 is offline 00940  Belgium
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Default Which class D amp for a 100W +/-28VDC power supply ?

Here is my situation:

I've got a very cute vintage Harman Kardon A401 integrated. But even if it sounds surprisingly good for something 30 year old, I'm considering replacing its internals for something a bit more up to date.

The amp is rated for 2x20W continuous (it seems very conservative) and I'd guess the xformer is somewhere near a 100VA. I changed the power supply caps some times ago for a pair of 10.000uf/50V. The rails are at +/-28VDC.

The modules I've been considering are based on the ta2022:
- http://connexelectronic.com/product_...products_id/45
(but this module requires higher rails ?).
- http://www.41hz.com/shop/item.asp?itemid=2 or http://www.41hz.com/shop/item.asp?catid=14&itemid=3

The TDA8920BTH seems also interesting:
http://connexelectronic.com/product_...products_id/48

Two questions thus:
- has anyone compared the ta2022 to the TDA8920 ?
- will the xformer be sufficient for those modules, with 6 to 8 ohms speakers ?

Thank you in advance for any bit of advice

And because it's a little cutie:

Click the image to open in full size.
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Old 29th August 2009, 11:20 AM   #2
col is offline col  Australia
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I recently bought a ConnexElectronics TDA8920, haven't tried it yet though as I'm still waiting for the 2x18VAC transformer to arrive.

Iv'e got the ConnexElectronics TA2022 the Toroidal I'm using with that is a 2x22VAC. It has a lot of power but the noise floor is a bit high.

I'll let you know what I think when I get a TDA8920 up and running.

col.
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Old 29th August 2009, 05:13 PM   #3
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I have a few Tripath EB-TA2022 boards for sale if you're interested.

FS: (3) Tripath EB-TA2022 2x100W modules

These include an onboard DC servo and output protection relay. I don't think those features are present on the ConnexElectronics boards.
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Old 29th August 2009, 05:17 PM   #4
gychang is offline gychang  United States
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Seems very interesting, use the old classic case with modern internals.

gychang

Quote:
Originally Posted by 00940 View Post
Here is my situation:

I've got a very cute vintage Harman Kardon A401 integrated. But even if it sounds surprisingly good for something 30 year old, I'm considering replacing its internals for something a bit more up to date.

The amp is rated for 2x20W continuous (it seems very conservative) and I'd guess the xformer is somewhere near a 100VA. I changed the power supply caps some times ago for a pair of 10.000uf/50V. The rails are at +/-28VDC.

The modules I've been considering are based on the ta2022:
- http://connexelectronic.com/product_...products_id/45
(but this module requires higher rails ?).
- http://www.41hz.com/shop/item.asp?itemid=2 or http://www.41hz.com/shop/item.asp?catid=14&itemid=3

The TDA8920BTH seems also interesting:
http://connexelectronic.com/product_...products_id/48

Two questions thus:
- has anyone compared the ta2022 to the TDA8920 ?
- will the xformer be sufficient for those modules, with 6 to 8 ohms speakers ?

Thank you in advance for any bit of advice

And because it's a little cutie:

Click the image to open in full size.
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