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Class D Switching Power Amplifiers and Power D/A conversion

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Old 29th November 2009, 07:31 AM   #1
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Default explaining class d

i would like to get into building/repairing my own amps

i mainly have alot of car audio amplifiers

orion 2500d', sundown 3000d's, etc. nice car audio amplifiers

could you guys post up some pics/tutorials pointing out which parts are what, what they do and just some general knowledge of the parts.

you don't have to be very specific, just basic knowledge that could help me get my feet off the ground on learning what you guys do and how.

also, could you give me a list of the terms you guys are using on the site.

for example: lpf=low pass filter, x/o= crossover, etc.

here is a pic of a sundown 4500D (similar to my 3000d's just bigger)

go crazy on circling parts and telling what everything is


Click the image to open in full size.

thanks in advance
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Old 29th November 2009, 11:04 AM   #2
luka is offline luka  Slovenia
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that looks like old DD z1

Anyway... what you need to check most of the times is, is there short in supply (that goes a lot of times), also output fets... then there are so driver cards,...

really depends, you just have to go one by one, starting with most common
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Old 29th November 2009, 11:34 AM   #3
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What you need to do, my friend, is read lots of schematics, preferably for circuits you have, so you can look at the pcb and the way it's wired up. Read lots of schems, read about why people have chosen the topologies they have, and why they chose the components they've used.
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Old 29th November 2009, 03:37 PM   #4
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It's Sundown Audio 4500D design by ZenonAudio.
Old DD z1 design by Nextem.
For service contact http://www.db-r.com/cgi-bin/yabb2/YaBB.pl
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Old 29th November 2009, 10:15 PM   #5
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that is a sundown 4500D. i don't have one yet since they haven't even been released yet but it is similar to my sundown audio 3000d's.

i don't need it repaired, all of my amps work fine.

i would just like to further my knowledge so that if the problem ever does arise that one of my amps needs repair, i can fix it myself.

LUKA, could you circle the fets on the board. i am looking for someone to give me a quick rundown of what all the parts are, what they do, and what makes certain models better than others.

thanks

tell me all about the parts circled

Click the image to open in full size.
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Old 30th November 2009, 06:38 AM   #6
luka is offline luka  Slovenia
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ok, so something like this

Red: input fets, i'd say 2 per trafo winding, so about 32 fets for that
Blue: smps control board, input protection and sensing, on the right of it, you have secondary main caps, 8 of them
Dark green: are diods, they come after input fets, every time I see some amp.
Light green: output fets, fets for D amp, 2-4 per inductor, and this is probably half bridge(you can link it with another), so inductors are in parallel
Yellow: output LC filter, another L in series with output, relays,...
White: input circuit, subsonic, LPF,gain,... and on card there is control for amplifier section, you could say brains of this part of amp, like other board, that is brains for supply section
Attached Images
File Type: jpg CIMG2025.jpg (393.8 KB, 173 views)
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Old 30th November 2009, 07:49 AM   #7
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Brewer, if you really want to get into automotive amplifier repair, then do yourself a HUGE favor and go buy this tutorial......

Learn To Repair Car Audio Power Amplifiers

While you wait for it to arrive, spend as much time as you can browsing and reading the info at that site (Basic Car Audio Electronics).


(No affiliation with bcae1.com or the awesome Mr. Perry Babin)
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Old 30th November 2009, 02:23 PM   #8
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thanks alot for the link to that tutorial, anonymous
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Old 30th November 2009, 04:58 PM   #9
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Quote:
Originally Posted by brewer_brewer View Post
thanks alot for the link to that tutorial, anonymous
The author of that tutorial and owner of the site is also a valued member here. You can find him in the car audio sub forum.
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