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Class D Switching Power Amplifiers and Power D/A conversion

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Old 7th December 2012, 08:38 PM   #1331
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Originally Posted by Redshift187 View Post
No they aren't surface mount, they are 5mm lead spacing, an exact fit to what's there. They are cheap and decent quality and able to be had quickly almost anywhere.

Oh yeah i must have mistyped the code before! Was there any noticeable change after you replaced the stock ones with these?
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Old 8th December 2012, 06:03 PM   #1332
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No I didn't notice a difference, but I'm filtering the input and driving only >180Hz to super tweeters with this amp. For anyone driving full range speakers down into the bass region, the more current handling the better, to a point. These are also shielded, which is nice.
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Old 8th December 2012, 06:16 PM   #1333
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Inductors are capable of More Bass IF your speakers are demanding /capable of it.. Change out inductors as mod step #3 or #4
First step would be to replace those wee green electrolytic caps with ~2.2uF Film and Foil versions I've found that the the Cheap (1$) yellow ones work better than Mundorfs in my Lepais. YMMV tho.
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Old 9th December 2012, 07:17 AM   #1334
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Agreed, basic idea for mods is start at the input, work your way toward the output.
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Old 9th December 2012, 09:44 AM   #1335
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Thanks guys I got myself a 12V 5A 60W AC/DC Power Supply Adapter Charger for PC LCD monitor TV

My next update then will be a PANASONIC CAPACITOR, ELECTROLYTIC, 16V, 5600UF

And i heard many good things about these ICE Components Inductor 1D10A-100M 10 uH 20 % 4.5 A
Is -+10% or -+20% better?
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Old 9th December 2012, 09:07 PM   #1336
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That Electro is likely Fine.
But a physically larger cap also gives advantage... space available allowing.
Stop worrying the coils, Lotsa time for those... later.
Coils are just noise filters in these.
An upgrade is for more amps capability than the early version hair thin wire coils were able to pass .. which restricted flows.. some.
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Old 9th December 2012, 09:39 PM   #1337
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Ok I got new power supply on the way, new 16V cap, also a 470uF direct replacement cap which is right behind the bass controls people said that it's beneficial to replace it.

Now the 2.2uF caps people said only made things worse, they said to do a direct replacement but better quality camps
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Old 10th December 2012, 11:19 AM   #1338
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Tolerances for components are better when lower, so 10% is better than 20%.
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Old 10th December 2012, 11:46 AM   #1339
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Originally Posted by Redshift187 View Post
Tolerances for components are better when lower, so 10% is better than 20%.
Well I got these hope their good
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Old 12th December 2012, 10:26 AM   #1340
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Hey, can anyone tell me how to bypass the tone circuit on the lepai 2020B board? I've already done this successfully on the original 2020A, but the 2020B has surface mount underneath and I can't find instructions for it.

BTW my original 2020 sounds incredible, but this 2020B amp sounds really dull and coarse - the tone controls don't work like on the original, and it seems like flat response requires the treble to be set to about 2 o'clock or more. I'm hoping removing the tone circuit will fix the sound.

It measures 50mV DC offset on one channel too.
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