Lepai T-Amp with TA2020

[hozepipe]

I found the info I needed in post no.925. Amp sounds better now.

[rongon]

Originally Posted by hozepipe

I found the info I needed in post no.925. Amp sounds better now.

Is your amp the type with all through-hole components on the board, or is it the newer version with some surface-mount components?

I was thinking of purchasing one of these, but it appears they've changed to surface-mount components, which would make it a lot harder to replace or eliminate parts.

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[hozepipe]

I have both the original (through hole only) and the model B which is a mix of through hole and surface. I modded the B version easily once I found the info I needed.

[rickdohc]

Good day all. i got a Lepai and a question.

I got two pairs of Bru Brown op amps, opa2134 and opa2134pa. seems that 2134 is a single and the 2134Pa is the dual channel, wich of these two model i should use in my Lepai 2020+

Thanks

[Bare]

Neither.. to be perfectly honest.
Difficult to implement an opamp swap 'properly' and the entire Tone stack in the Lepai is Dubious.. at best.
IMO Lepai works to it's best with ALL the tone crap wiped from the board..
Sad but ohh so true.

[Fynn]

Yep. And if the gain is too low, you can adjust the gain with the 2 resistors after the decoupling-caps(c20/21) next to the TA2020 chip, according to the datasheet.
They were 15k and 20k for me, which sets the gain to: 12*20k/15k ->16x Vrms.
At 9Vrms you have 20W into 4 ohms / 10W into 8 ohms, which is about maximum for the ta2020. You reach that with 560mV.

I don't know how sensitive you can make the TA2020 though.

[rickdohc]

Originally Posted by Bare

Neither.. to be perfectly honest.
Difficult to implement an opamp swap 'properly' and the entire Tone stack in the Lepai is Dubious.. at best.
IMO Lepai works to it's best with ALL the tone crap wiped from the board..
Sad but ohh so true.

well i am gonna need to read all this pages to understand what i need to do to bypass the tone circuit.. or at least, so i can take it to a eletronic shop and tell them what i need.

[Fynn]

You should look into this one:
LP-2020A+ mod thread
Only covers the newer 2020A+ model, so you can save yourself the 100+page journey

[Bare]

Originally Posted by rickdohc

well i am gonna need to read all this pages to understand what i need to do to bypass the tone circuit.. or at least, so i can take it to a eletronic shop and tell them what i need.

DIY Audio is your friend:
Amplifier:Lepai T Amp - diyAudio

[Redshift187]

Originally Posted by rickdohc

I got two pairs of Bru Brown op amps, opa2134 and opa2134pa. seems that 2134 is a single and the 2134Pa is the dual channel, which of these two model i should use in my Lepai 2020+

They are both dual, that's the 2 in 2134. The single is 134 and the quad is 4134.

I agree with Bare, removing the opamps completely is the best thing I did for the sound of my LP-2020A+.