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 NEW  Matt presents bias and operation data for the 6V6 tube in SE operation - 6V6 Single-Ended (SE) Ultra Linear (UL) Bias Optimization.

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 Post subject: LC Audio ZAPpulse 2.1 SE
PostPosted: 18 Apr 2010, 11:55 
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Joined: 10 Sep 2009, 16:06
Posts: 72
Location: Sweden, Båstad
I have two class-D amp modules from the Danish manufacturer LC Audio that have been lying around and nobody's ever done anything with them so I thought do something about it and build a power-amp, I have a transformer and two 15,000uF caps that have been salvaged from a murdered Pioneer amp. Does here anyone have any experience to share on this project? The idea is pretty straight forward: Rectify the 50V-0V-50V winding on the transformer and add the 15,000uF caps to get rid of ripple as the guide suggests as the 50V AC will end up at roughly 70V DC according to the formula U DC =U AC *sqrt(2) and then lose about a volt over the rectifiers for a healthy 68-69V (http://www.lcaudio.com/pdfs/zp21mateng.pdf). I don't know what to build for chassis yet though, maybe a wood frame with a metal sheet on top or something along those lines.

Any input is much appreciated.

Regards

Ebbe

P.S. These are real little monsters, the size of a credit-card but they can put 290W into an 8 Ohm load when run on 70V.

P.P.S. The Transformer is rated at 820W and has the following windings: 70V-35V-0V-35V-70V, 50V-0V-50V and an 18V winding

_________________
"I've done this a thousand times befo..." on not voltage testing before getting to work.
"I'm gonna take my time on the next amp....." on First tube project.


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PostPosted: 18 Apr 2010, 12:08 
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Joined: 10 Sep 2009, 16:06
Posts: 72
Location: Sweden, Båstad
A photo of the stuff,
Attachment:
DSC00684 copy.jpg

The rectifier bridges are MB352, I was thinking about reworking the powersupply from the suggested and add one or two RC-filters to it and snub the big caps.

As earlier noted ideas are welcome.

Regards

Ebbe


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_________________
"I've done this a thousand times befo..." on not voltage testing before getting to work.
"I'm gonna take my time on the next amp....." on First tube project.


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 Profile  
 
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