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Class D Switching Power Amplifiers and Power D/A conversion

Lepai T-Amp with TA2020
Lepai T-Amp with TA2020
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Old 16th September 2010, 02:17 PM   #631
iko is offline iko  Canada
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Lepai T-Amp with TA2020
To you muppet man.
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Old 20th September 2010, 01:05 AM   #632
cjron is offline cjron  Philippines
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Quote:
Originally Posted by denztan View Post
Guys, i have received my new amp as i upgrade the resistors it's giving me a dc offset of 95mv for the right channela and 12volts on the right channel!!! what would cause this to happen? bad capacitor? bad resistor? also i have another 1 that humms as soon as i turn on the amp.. amy help will be much appreciated.

Msj965,
Wassup!?!?! i'll update you if i have any progress w/ the upgrades. i'll have the LM4562 coming in soon
uy LM4562! AYOS....

ojofool@pdvd
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Old 20th September 2010, 05:35 AM   #633
savenger1 is offline savenger1  Australia
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hey all,

I'm having a problem with my lepai ta2020 in a car installation...

I've wired it directly to the lighter socket on the accessory circuit... it works great with the ignition on 'acc' or 'on', but as soon as I start the car the sound cuts out.

The thing that has me stumped - the LED stays on and there is current going to the amp. What could be causing this? Maybe a grounding problem?... or insufficient amperage from the alternator?

thanks in advance if anyone has any ideas.
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Old 20th September 2010, 10:33 AM   #634
alexg is offline alexg  Philippines
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Lepai T-Amp with TA2020
If I want to bypass the volume control, am using a preamp, Just install a 100K resistor on the input shunt to ground?

Thanks.
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Old 20th September 2010, 03:11 PM   #635
cjron is offline cjron  Philippines
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Originally Posted by alexg View Post
If I want to bypass the volume control, am using a preamp, Just install a 100K resistor on the input shunt to ground?

Thanks.
alex, im also using a preamp 12sn7. i just set the lepai to 3oclock and adjust the preamps volume.
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Old 21st September 2010, 01:41 AM   #636
alexg is offline alexg  Philippines
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Lepai T-Amp with TA2020
Quote:
Originally Posted by cjron View Post
alex, im also using a preamp 12sn7. i just set the lepai to 3oclock and adjust the preamps volume.
I can do that too, but I know that the attenuator installed are of questionable quality, so I might as well bypass it. I will let you know how it goes.
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Old 21st September 2010, 03:09 AM   #637
MikeHunt79 is offline MikeHunt79  United Kingdom
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Quote:
Originally Posted by savenger1 View Post
hey all,

I'm having a problem with my lepai ta2020 in a car installation...

I've wired it directly to the lighter socket on the accessory circuit... it works great with the ignition on 'acc' or 'on', but as soon as I start the car the sound cuts out.

The thing that has me stumped - the LED stays on and there is current going to the amp. What could be causing this? Maybe a grounding problem?... or insufficient amperage from the alternator?

thanks in advance if anyone has any ideas.
I found the same thing, too much voltage, the Lepai doesn't like being run above 14v.
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Old 21st September 2010, 10:18 AM   #638
savenger1 is offline savenger1  Australia
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Originally Posted by MikeHunt79 View Post
I found the same thing, too much voltage, the Lepai doesn't like being run above 14v.
Yeah looks like that's it... battery shows 12.8v when the car is off, but about 13.9 when the alternator is running.

What is the best way to skim 1v off the circuit so that it can work?
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Old 21st September 2010, 02:17 PM   #639
Pano is offline Pano  United States
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Lepai T-Amp with TA2020
Quote:
Originally Posted by MikeHunt79 View Post
I found the same thing, too much voltage, the Lepai doesn't like being run above 14v.
What problem did you find, Mike? In my experience the TA2020 chip does real at 14V, so no problem in a car. Is it something else in the Lepai?

The TA2024 seems more voltage fragile.
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Old 22nd September 2010, 10:18 PM   #640
killmister is offline killmister  France
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Default strap

Hello everybody.
Sorry for my poor english !

I'm actually realize a tweak for my lepai.
I sought tips and images and i noticed this : (see pics)

Apparently ,all amp lepai do not have this strap between the two ceramic capacitors .
Someone has an explanation?

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File Type: jpg 2.jpg (5.4 KB, 620 views)
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