TPA3255 - all about DIY, Discussion, Design etc

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#1,861
daniboun said:
I will go for the AIYIMA TPA3251 instead with Antipop at Startup (see my previous coments) it uses ELNA audio grade caps as well.
To answer you both are the same, the second TPA3255 has just a QC3008 BT APTX chip added.
I have absolutely no complains with the RCA inputs (I use a DAC double AK4497 with BT APTX HD protocol). You can improve the sound when changing the AOP (OPA1622 for example)

For the PSU this one just works fine with the TPA3251 :

FX-AUDIO Adaptateur Secteur Alimentation 100-240V vers 36V 6A - Audiophonics
Click to expand...

Thank you, thats a good point.
I was just wondering if TPA3251 would be ok to drive 8Ohm speakers, that was my consideration for TPA3255 in the first place.
 
#1,862
albunicolae said:
Thank you, thats a good point.
I was just wondering if TPA3251 would be ok to drive 8Ohm speakers, that was my consideration for TPA3255 in the first place.
Click to expand...

If you read my test... The TPA3151 can drive any 8 ohms speakers.@ 150W RMS / Max
I am using very high end made in France Speakers 2.5 way @ 93DB @ $2500 !
This amplifier (with a pair of OPA Burson Audio V5i or OPA1622 or OPA1656) + the appropriate PSU, is absolutely awesome.

Take a look here, Rhing (member) compared it to McIntosh MC240 @ $3000
You would be surprised )

TPA3251d2

IMG-20200416-101128.jpg

IMG-20200416-102548.jpg
 
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#1,874
zek said:
Only for directly replaceable chips.
Some also need some resistor or capacitor.
Click to expand...

For the OPA1622 the pin out is different from other 8-Pin equivalents and the enable pin needs to be kept high for it to work !!

This solution only works for pin to pin compatible replacements but is quite neat as it keeps all the traces pretty short. I was looking at it for the OPA1656 chip which I think would work in this type of "carrier".
 
#1,878
Just wondering if anyone has tried this particular TPA3255 amp (see pic and link below)

It's currently available from several Ebay sellers without power supply for as low as US$50:
TPA3255 2.0 300W+300W Stereo HIFI Power Amplifier Board Class D Digital Audio | eBay

I have the right transformer and caps to make a 46V linear PS. I want to make sure that the regulator is the HV type before taking the plunge. The text in the listing says it can be used up to 48Vdc. Also, has anyone unsoldered the regulator and supplied 12V from a separate supply?
 

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#1,879
CharlieLaub said:
Just wondering if anyone has tried this particular TPA3255 amp (see pic and link below)

It's currently available from several Ebay sellers without power supply for as low as US$50:
TPA3255 2.0 300W+300W Stereo HIFI Power Amplifier Board Class D Digital Audio | eBay

I have the right transformer and caps to make a 46V linear PS. I want to make sure that the regulator is the HV type before taking the plunge. The text in the listing says it can be used up to 48Vdc. Also, has anyone unsoldered the regulator and supplied 12V from a separate supply?
Click to expand...

Yessssssssss sir already tested weeks ago, I own it a also own the TPA3251.
take a look here, all have been said see my review here :

TPA3251d2
 
#1,880
Hi

From what I read many times these eBay offerings are not meant to be powered with such a high dc voltage since some of the caps used inside are only rated 35Vdc. Also, I wouldn’t trust the tiny DC jack for such high power. I would stick with the 3e Audio or TPA3255EVM but i understand that at this price it’s tempting.

BR
Eric
 
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