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Class D Switching Power Amplifiers and Power D/A conversion

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Old 16th March 2010, 06:31 PM   #541
srinath is offline srinath  United States
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Sorry, I didn't know and am still not certain it does not have the 2020.
And If I never open it up again, I can still be unsure and still be in this discussion (OK OK I'm just being a brat) ... no sense muddling up someone's amp with my non 2020 observation.

BTW mine is an FM receiver + amp, and maybe those dont have a 2020 ?
Thanks all for your patience.
Cool.
Srinath.
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Old 16th March 2010, 06:43 PM   #542
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Hi srinath, this thread is about Lepai LP2020:

Click the image to open in full size.

You certainly doesn't have the LP2020 but another kind of Lepai Amplifier because the LP does not have an FM Receiver.
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Old 17th March 2010, 02:37 AM   #543
srinath is offline srinath  United States
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mine says FM-103. I guess now I know.
Cool.
Srinath.
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Old 30th March 2010, 11:14 AM   #544
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I'm also busy modding my lepai. now I'm wondering wether the indictor below is a suitable replacment for the inductors.

INDUCTOR, ROD CORE10.0UH 5 A
Inductance:10H
Inductance Tolerance: 25%
Max DC Resistance:0.0151ohm
DC Current Rating:5A
Self Resonant Frequency:50MHz
Series:WE-SD
Core Material:Ferrite
Inductor Case Style:Radial
No. of Pins:2
Lead Spacing:18.8mm
Case Style:Radial
DC Current Max:5A
Resistance:15.1mohm
Body Diameter:5mm
Core Material:Ferrite
External Diameter:5.9mm
External Length / Height:22.5mm
Inductor Type:High Current
Lead Length:19mm
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Old 31st March 2010, 02:54 PM   #545
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Quote:
Originally Posted by Ekand View Post
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
Hi Fredrik, I posted pictures and informations about bypass on a previous post, please check here

Lepai T-Amp with TA2020
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Old 31st March 2010, 06:16 PM   #546
nige838 is offline nige838  United States
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Default PSU Cap

I plan on running my amp solely off of batteries...therefore, do i need the PSU Capacitor at all of can I just remove it from the circuit. I can't imagine that it has a purpose, since the circuit can take as much juice as it wants from the batteries...

Thanks,
Nicholas G.
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Old 31st March 2010, 11:53 PM   #547
wwenze is offline wwenze  Singapore
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Quote:
Originally Posted by nige838 View Post
I plan on running my amp solely off of batteries...therefore, do i need the PSU Capacitor at all of can I just remove it from the circuit. I can't imagine that it has a purpose, since the circuit can take as much juice as it wants from the batteries...

Thanks,
Nicholas G.
Its purpose is to provide the extra juice since it is a "faster" source of juice than batteries.
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Old 27th April 2010, 07:53 PM   #548
vzon is offline vzon  United States
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Default Power Supply for Lepai 2020

I have been using the LApai amps for a several months now and really like them. I first had one and then got a second one. I have them hooked to my computer , one is the main front left right channels and the other is for the subwoofer channel.

I made a power supply by using an 8 amp switching supply and hooked that to three large 1 farad stiffening capacitors that are normally used in auto sound systems and it works very good. I can get floor rumbling bass out of the amp.

I have found that just one of the bigexterior stiffening capacitors was not enough as when I turned the volume up the voltage wolud drop on the digital readout. When I hoooked three up together and had an 8 amp power supply it could hold the voltage steady even at loud volumes.

Just recently blew the main amp out and have ordered two more. I plan on doing some modifications to it like I have read on the forum here, probably starting with the input caps.

So after all that I have also been looking into Ultra capacitors. with a few of these one could get up a farad or more worth of capacitors inside the lepai case, What you can do to start is hook three of the 5.5 volt 1 farad ultra capacitor in series so they can handle 16.5 volts max, which wolud be fine for a 12 volt system. With just three of them you could have about 330,000 uf worth of capacitor inside the case of the lapia 2020.
Each of them is only 3/4 inches in diameter and about 1/4 inch thick.
thats all for now. If any one wants photos let me know.
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Old 30th April 2010, 12:58 AM   #549
troystg is offline troystg  United States
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Hi and sorry I'm late to the party..


I just purchased and received my Lepai 838 and hooked it up on my work PC.

Surprisingly good for $14.95. I used the 3A pwr supply from my Linksys cable modem.

So the only issue I have with it so far is that the "mega bass" volume is independent of the main volume?!?!? (What were they thinking?)

So I want to mod by cutting the tracks to the mega bass pot and tying it directly to the main volume pot so I have the extra trim for "sub" level control.

Has anyone else tried or done that?
Anyone have a schematic to see if I can pull the sub volume off a buffered location AFTER the main volume?

I do apologize if this has been covered but 55 pages are more than I can read in a "reasonable" time frame and I hope to do the mod this weekend.
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Old 30th April 2010, 01:49 AM   #550
cyteen is offline cyteen  England
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Actually your early for the next party. The 838 doesn't use the tripath 2020 chip and so is unrelated to this thread. It may use Sanyo (LA4625) Toshiba (7240) ics so also not for the Class D section.
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