TPA3251 2Ch Amplifier Board DIY Design (Compact size/Amazing Performance)

[Kjeldsen]

I have the same issue on my company laptop. It's full of security and firewall. On my phone and private PC's there's no issues.

 

[robinlawrie]

ok so the site works on my phone.. redirects to ebay.com pages for sale.

does anyone have stock of these in Europe? shipping stuff to Italy from China can get very, very expensive once the customs guys invent their chosen import duty to pay.

 

[Kjeldsen]

If anyone stocks these in europe, the customs and VAT will be added anyway.

 

[robinlawrie]

yes, but i think the Italian customs have special skills. they choose the amount, and there is no way to challenge it.

i once paid 60 euros import duties on a 40 euro usb tv tuner from China. (the piece was basically unique and no equivalent available in Europe, so i bit my tongue and paid)


since then ive always tried to find sellers within the EU. very frustrating when you can see the price paid outside EU.

 

[Kjeldsen]

I see

I Denmark it's fixed fees to handle the import = 21 euro, but the supplier discription of the product have to good, otherwise you may be charged incorrect customs. Personally I have not tried that.

 

[SanjeevM]

3eAudio, I have got a TPA3251 board last week and I am trying it out now. Its a wonderfully well made board.
I had a question. The board says that it needs a power supply of 24-36 volts DC. My PS gives out 39 volts DC. Can I feed 39 volts to the board?

 

[wushuliu]

Does your PS have a potentiometer to lower output voltage? Usually 10% is the range.

 

[DUG]

3eAudio, I have got a TPA3251 board last week and I am trying it out now. Its a wonderfully well made board.
I had a question. The board says that it needs a power supply of 24-36 volts DC. My PS gives out 39 volts DC. Can I feed 39 volts to the board?

Data sheet says 36 typical, 38 max.

 

[SanjeevM]

Does your PS have a potentiometer to lower output voltage? Usually 10% is the range.

No, it doesn't.

 

[cacao ambiance]

im using a sure boost converter, great for battery running i hope . still wiring/boxing mine up
Sure Electronics' webstore 500W BOOST Converter for CAR Audio - TL494

 

[xlisec]

Hi,
I received this board last week (it looks nice ). I need buy power supply. Is MEAN WELL LRS-150-36 good choice or I must buy HRPG-150-36 with constant current limiting circuit?

 

[doctormord]

150W is a bit on the low side -> LRS-350-36

 

[SanjeevM]

Hi,
I received this board last week (it looks nice ). I need buy power supply. Is MEAN WELL LRS-150-36 good choice or I must buy HRPG-150-36 with constant current limiting circuit?

Where did you find this board, it has disappeared from eBay.

 

[wealas]

It's still there but you have to use the eBay.com site, it doesn't appear if you go via other countries. I ordered one last week.

 

[mortenaasted]

Hi
I have this board, and it is performing very well.
The board is mounted with 100k before the input stage.
The resistor is messing my log curve.
Will the opamp handle 10-15k instead of the 100k?

Regards Morten

 

[xlisec]

150W is a bit on the low side -> LRS-350-36

Thank you for your reply. I can not find any LRS-350-36 in czech shops. Maybe it is old version without PFC. I don't know. I choose MEAN WELL PID-250C, it have 250W without fan. I live in flat, I don't need full power this board. This smps have two outputs 36V and 5V output. Integtrated 5V output is advantage for me.

 

[DPH]

Not sure what the schematic is for this board but 100k during in front of an inverted buffer is a lot high and noisy. Need to check the feedback resistor as well.

The lrs power supply does not have pfc.

 

[xlisec]

Where did you find this board, it has disappeared from eBay.

It's difficult with 3e-audio.com. They official webpage is disable for half of world. You can check it at Website Availability Test - Uptrends. Ebay account don't show relevant goods for banned countries. I talked with 3eaudio member via diyaudio private messages. He or she reply me quickly. It is some trouble with china post.

I used german VPN. Buy it on ebay like guest. Send it to Germany and resend to Czech. Resend was cheep about 6 euro.

 

[mortenaasted]

Not sure what the schematic is for this board but 100k during in front of an inverted buffer is a lot high and noisy. Need to check the feedback resistor as well.

The lrs power supply does not have pfc.

Hi DPH
Attached is the schematic for the frontstage.
I would change the resistor to approx 15k to make my 100k lin pot into a "fake" log, but i am unsure if it is messing som other things up.

Regards

 

[DPH]

Oh those 100ks are bleeder resistors to shunt dc off the input. Your a.c. coupled into a 10k rf, rg inverted buffer.