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Class D Switching Power Amplifiers and Power D/A conversion

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Old 1st July 2009, 07:43 AM   #431
msj965 is offline msj965  United States
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Thanks a lot!!! I'll try to secure the ground points. I remember that I change the original wire to a different one that use to connect the ground.I'll let you know.
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Old 2nd July 2009, 06:08 PM   #432
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I just received my Lepai Amp a few minutes ago, and with it a very nice looking 4A power supply. I was expecting a 2.5A or less. I will be able to plug it in and hook it up later tonight.
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Old 3rd July 2009, 03:39 AM   #433
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Hi,

Plugged in the Lepai with the 4A power supply that came with it. Pretty much junk, I mean it plays but it was a noisey and loud at you sound. I switched it out for the HLLY 4A Samsung Power supply, a much better result! Nice sound, I like my treble flat and also seemed to like it flat with the Lepai. I was able to get some nice bass with this amp by adjusting the bass knob about 1/4 of the way. It was nice to have that bass adjustment! It distorted at 2/3rds volume, so I turned down the bass and turned it up again it went up more before it distorted.

I changed the Samsung out for a 4A power supply I bought awhile ago. This power supply has a deeper black background, but not as quite as widely dispersed as the HLLY power supply, but it gave the Lepai an AWESUME bass sound once I adjusted the bass again for it. Not bad at all!!! It also distorted when I gave it the crank test, but it put out some great sound before that. In fact it has a really nice sound, imo. Now I also have to try the HLLY 2020 Amp with the 4A power supply that I've had for awhile.
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Old 3rd July 2009, 10:47 AM   #434
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Hi Tripath07 (or anyone else).

I am a little confused with the current requirement of the power supply for the Lepai.

My Lepai LP-2020 came with a budget 12V 1.2A power supply. Given that this would not be enough to create the 2x20watts it is quoted as being capable of (12V x 1.2A < 2x20W), am I simply being shortchanged in output power?
Are there other advantages to moving to a higher amp power supply?
Is 4A sufficient for max power (do you calculate using RMS or PMPO)?
Or is the current not really the issue, but the quality of the power supply?

The reason I ask is that I am going to use a second Lepai as a base for a portable battery powered stereo system for my boat. It will be running off a 12V SLA battery.
I was assuming a 2A fuse was sufficient but should I increase this to 5A?
What is the maximum power draw the amp has?
And any ideas on the approx current draw in standard usage as this will greatly affect battery life? For instance is it normally <0.5A, <1A, between 1-2A etc?

Am learning quickly but not quickly enough...

Much appreciated,
-Vincent
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Old 3rd July 2009, 11:37 AM   #435
col is offline col  Australia
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motorbikevinnie,

I guess if you read the entire thread and buy a half decent multimeter you could work all that out for yourself. one tip though, If you are running off of batteries don't plug it in if the voltage is over 13.2v Worth snipping the little zener diode in half too

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Old 3rd July 2009, 02:03 PM   #436
msj965 is offline msj965  United States
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Hi Tripath07,

Just wanna ask where did you get your power supply from? I'm from twin cities too.
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Old 3rd July 2009, 02:13 PM   #437
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Quote:
Originally posted by col
motorbikevinnie,

I guess if you read the entire thread and buy a half decent multimeter you could work all that out for yourself. one tip though, If you are running off of batteries don't plug it in if the voltage is over 13.2v Worth snipping the little zener diode in half too

col.
I'm running one of my Lepai's from 14.4v for most of today and it's been working fine. The Bass is all the way down tho, and zener removed.

Don't blame me if you try this and kill you're TA2020 tho, I've managed to kill one using 14.4v with one...
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Old 3rd July 2009, 03:34 PM   #438
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Hi msj965,

Nice to hear you are from the Twin Cities also! I bought it on-line over a year ago, and had the site bookmarked but my laptop died with the blue screen of death. Anyway, here is the info from the back of it.

GME switching power supply
Model: GFP651DA-1240
INPUT: 1.4A
OUTPUT: 4A

Good luck, I seem to remember it was $23 or so.
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Old 3rd July 2009, 03:55 PM   #439
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Hi motorbikevinnie,

The 4A power supply that came with it is junk, so don't feel bad. It is the quality of the supply that counts not the output. It should probably be over 2.5 A output though for 2020 chip amps. A 12v battery will sound the best, imo.

I posted the info, for my other 4A power supply!
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Old 3rd July 2009, 04:49 PM   #440
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Quote:
Originally posted by MikeHunt79

I'm running one of my Lepai's from 14.4v for most of today and it's been working fine. The Bass is all the way down tho, and zener removed.

Don't blame me if you try this and kill you're TA2020 tho, I've managed to kill one using 14.4v with one...
I take back what I said, my Lepai kept cutting out at 14.4v.

I'm going to use a 7812 in order to drop down the voltage a little.
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