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Class D Switching Power Amplifiers and Power D/A conversion

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Old 3rd January 2010, 06:00 AM   #521
msj965 is offline msj965  United States
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Default Hello:)

Just a little Q's on lepai speaker output.Do I need to change the .47u cap to .22 to drive my 8ohms (2way speaker)?Thanks and more power!!!
Ann
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Old 13th January 2010, 12:39 AM   #522
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Following all the hoopla on these little buggers and figured I'll give it a shot.

Just pulled the trigger on 2 of these little beauties on ebay. Figured I'll keep one stock and mod the other so as to do an A-B conparison.

Going to order my parts thru Mouser and was wondering if this inductor would be the correct one:

13R103C Murata Power Solutions Power Inductors

All help will be greatly appreciated:: E-C
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Old 13th January 2010, 12:44 AM   #523
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Quote:
Originally Posted by msj965 View Post
Just a little Q's on lepai speaker output.Do I need to change the .47u cap to .22 to drive my 8ohms (2way speaker)?Thanks and more power!!!
Ann
According to the data sheet for the chip, I would say YES, if you are going to primarily use 8ohm speakers.

But maybe someone who is more knowledgable than me might know more/better.

E-C
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Old 13th January 2010, 08:42 PM   #524
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Hi everyone, this is my todo for now. Any suggestions?
Thanks
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Old 14th January 2010, 04:18 PM   #525
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Hey, here is a small update!
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Old 23rd January 2010, 03:10 PM   #526
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Location: Wiltshire, England
Default Completed Modifications

Update to my previous post (#518, Pg 52)...

g) changed tone circuit capacitors (with 1nF, 10nF, 5.6nF and 56nF / 5% bought off eBay) and resistors (20k, 2k2, 10k metal film 0.4W/0.1%) as per post #484, Pg49. Also replaced 430R (marked 100R *2) with wire links.

h) changed pots: volume (50k Dual Log RS 249-9288), bass & treble (100k Dual Log Rapid Electronics 65-1466).

i) still to do (have the diodes 1N5817).

j) changed inductors for 10uH/2.8A (RS 233-5134).

Also changed 1k5 resistor in series with blue LED for 4k3 (an arbitary decison) but led still seems bright! Need to see it in the normal evening low-light viewing conditions. Probably need to measure VOPA voltage and chose value to halve current through LED.

Issues:

1. original control knobs did finally come off with (not so) gentle prising but one tone control spindle broke from the slider inside the pot.

2. The new cermet tone control pots had a larger screw thread so had to enlarge the holes on the faceplate. They also sit slightly forward of original ones which means front faceplate now has slight bow in it (about 1-2mm).

3. Had to drill small hole in plastic see-through bezel (around volume control) to take the small metal positioning lug on the new pot. However, because tone pots were slightly forward, was unable to fully tighten fixing screw on volume pot so the positioning lug does not need to mate with new hole!

4. The original plastic control knobs have longitudinal flutting to secure them to the old pots (which are also flutted). However the new pots had plain spindles. Therefore decided to replace control knobs with some aluminium ones I already had in my spares box.

Must say can really notice the difference on initial listening. Much crisper sound and tone controls definately perform better. Well worth the effort!
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Old 10th February 2010, 11:25 AM   #527
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Hello

I'm new to the forum. At first I beg your pardon for my english.


I have bought an Lepai TA2020 and now I would like to pimp it.


I have read something about the bias. I measure 0,1 and 0,2V bias. I think that is OK but for interest reason how can I calibrate it?


The power on plop ist very disturbing and I think that my speakers don't like it.

I figured out an easy way to build a delay.
You need only 2x4148, 1x220uF, 1x1k

I attach my drawing with mod.

In LTSpice it works fine.
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File Type: png scan10006k_mod1.png (71.7 KB, 939 views)
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Old 10th February 2010, 06:55 PM   #528
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Hi all, i've a question...
i tried to tweak my lepai T-amp...for now i only changed the operational with a Ne5532P... now the amp sounds very smooth... too smoth...is impossible, the gain is too low!!! Why this problem? i tried to put back the old op-amp and the sound was good and loud again... If we change the op-amp or we bypass can we use the lepai with a low signal source like ipod nano?? or we need a preamplifier??. thanks
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Old 3rd March 2010, 05:18 AM   #529
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Default How do I bypass tone controlls???

Hello

New to this forum, I have been reading this thread for about two weeks byt i cant seem to find any information of how I can bypass the tonecontrolls.

Could someone please post an image an explaine where and how it is done.

Best regards

Fredrik
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Old 9th March 2010, 10:11 PM   #530
nige838 is offline nige838  United States
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Default Bridge

Can this amplifier be bridged? I just plan on running one 6 X 9 (4ohm) 2 way speaker, rated at 60 watts rms...

Thanks in advance,
Nicholas G.
nige838@gmail.com
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