Lepai T-Amp with TA2020

[6sigma]

Lepai LP-2020A+ and Dayton B652 speakers from Parts Express are now connected to a laptop with 480 CD's worth of FLAC files. Modest expectations for this near-field setup have been far exceeded by the sound. No mods were done. Just plugged them together and started listening to music. Enjoyable.

 

[Mariusmssj]

Hey guys,
I got a the amp from amazon and I am really loving it but going higher up it start to distort the sound. I got a friend that can get hold of electrical goodies, capacitors, chokes, ect. He offered to get me better capacitors and anything else I would need and replace them for me. He asked me to get a list of things that I would need to he could order them.

I did read the stuff of page 60 but that is for an older model. What changes would you suggest to battle the distortion and just to have higher quality sound all together?

Thank you

 

[Mariusmssj]

Hey guys,

I got the capacitors and now just need to buy the Inductors. Should I get 4 or 5?

An externally hosted image should be here but it was not working when we last tested it.

And what's the best inductors that I could buy??? I don't mind spending a bit on them.

Thanks

 

[pkozul]

Choke coil for class-D amplifiers 10uH 3A

These are the best inductors I've come across... others may have better options...

4 pcs Choke coil for class-D amplifiers 10uH 3A | eBay

 

[AC439]

Hey guys,
I got a the amp from amazon and I am really loving it but going higher up it start to distort the sound.

I also bought one from Amazon for a friend of mine. It came with a small power adapter. This should be the first thing to consider changing out. The small power adapter will not be sufficient to provide power for higher volume.

 

[Mariusmssj]

Is he getting a lot of static as well? I mean even with volume down my speakers are macking high pitched noise which seems to be coming from my pc. When I unplug the 3.5 audio jack from my sound card it stops. If i plug it in ty phone it does not have that noise.

Playing games it just goes crazy, i think it'smy sound card picking up stuff from my graphics card

I bough this cable, hope it helps.

 

[Mariusmssj]

These are the best inductors I've come across... others may have better options...

4 pcs Choke coil for class-D amplifiers 10uH 3A | eBay

Well this says it will take 4 weeks to get here

Do you think these(BOURNS INDUCTOR, RADIAL, 10UH 10%, 3A) would be any good?

 

[Redshift187]

I used Wurth 10uH inductors rated at 4.7A, part number 7447452100. Can be had from Digikey, Mouser, Farnell, and others, about $2 each.

Something I didn't know but have since learned, is that the dot on the inductor should go on the chip side (input side) to reduce EMI.

 

[Mariusmssj]

I used Wurth 10uH inductors rated at 4.7A, part number 7447452100. Can be had from Digikey, Mouser, Farnell, and others, about $2 each.

Something I didn't know but have since learned, is that the dot on the inductor should go on the chip side (input side) to reduce EMI.

Those are surface mounted but sure how would I get them on.

Does it matter if it's 4A instead of 3A for these inductors ?

 

[Redshift187]

Those are surface mounted but sure how would I get them on.

Does it matter if it's 4A instead of 3A for these inductors ?

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.

 

[Mariusmssj]

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?

 

[Redshift187]

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.

 

[Bare]

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.

 

[Redshift187]

Agreed, basic idea for mods is start at the input, work your way toward the output.

 

[Mariusmssj]

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?

 

[Bare]

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.

 

[Mariusmssj]

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

 

[Redshift187]

Tolerances for components are better when lower, so 10% is better than 20%.

 

[Mariusmssj]

Tolerances for components are better when lower, so 10% is better than 20%.

Well I got these hope their good

 

[hozepipe]

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.