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Class D Switching Power Amplifiers and Power D/A conversion

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Old 9th May 2009, 05:35 PM   #231
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I find below message from commerial site.

No turn-on 'pop' noise
Yup, without the input cap, there's no charging of cap during power up. Thus, no more "power up pop". Just a soft 'tick' sound.

http://diyparadise.com/charlize2.html
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Old 9th May 2009, 06:18 PM   #232
Puffin is offline Puffin  United Kingdom
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Panomaniac. I see from the Audiomagus site that you currently have health problems. I am really sorry to hear that. You helped me through my first mods to the Sonic Impact amps and was really grateful. I trust you will be restored to full health soon.

Regards.
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Old 10th May 2009, 04:09 AM   #233
Pano is offline Pano  United States
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Hi Puffin. Thanks - but just t clear things up - that's NOT me. That would be Mike Wyatt who founded AudioMagus.

I am no longer working with AudioMagus so I don't know much about what's going on. I wish Mike W. all the best and hope he gets back to good health soon!
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Old 10th May 2009, 08:07 PM   #234
Puffin is offline Puffin  United Kingdom
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Thanks for putting me right.
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Old 10th May 2009, 09:27 PM   #235
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And thanks for your good thoughts!
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Old 15th May 2009, 07:04 PM   #236
aszu is offline aszu  United Kingdom
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Anyone found out what is the easiest way to bypass tone controls? I am really tempted to do this in order to improve sq even further...
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Old 15th May 2009, 11:16 PM   #237
col is offline col  Australia
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would be good to be able to place a switch in the circuit so that you could turn the tone controls on or off. Anyone got any ideas?

There has been some work done on bypassing the tone controls on the 1st version of the Lepai, there are some posts and photos about that earlier in the thread. The circuit board has significantly changed since then though.

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Old 20th May 2009, 01:59 PM   #238
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Hi Col,

I haven't found LM4562. I replace JRC4558 with OPA2134PA. The sound became crystal clear. I shall LM4562 once I found.
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Old 20th May 2009, 02:26 PM   #239
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hmm, my ghettoblaster project didnt start out that well. i connected my 12v motorbike battery to my lepai t-amp with the powercord supplied and the cord started to overheat. probably shortcircuited the damn thing, due bad isolation of the cord :|
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Old 20th May 2009, 05:02 PM   #240
Gmorris is offline Gmorris  United States
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Panda360:

So did you try by-passing the input cap on your Lepai? If so, how was the end result?


I'm about to construct a portable "boom-box" using aluminum angles and some old Polk Audio bookshelf speakers. I'll post some pics once I'm done.
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