Issues with 3e Audio TP3255

[Wrayster]

Hi

I noticed a number of posts on this website forums about this board so wondered if anyone can help...?

I’ve put this together with a power supply from 3e Audio however there’s a high pitched noise coming out of my speakers which hooked up and turned on. A similar sound can also be heard if I put my ear near to the enclosure I’ve put it in.

I’ve communicated with 3e Audio, they asked me to change a couple of components on the power supply board which I did but that hasn’t solved the issue completely.

I’m considering purchasing a different power supply to see if that will solve the issue. Maybe a Meanwell EPP-400-48 or this that I found on eBay
https://www.ebay.co.uk/itm/48V-8-3A...063334?hash=item4213904466:g:FVYAAOSw2k5dvrS6

However before I go ahead and throw more money at I thought I’d check to see if there’s nothing else I’ve done wrong?

I don’t really want to pay out for another power supply if it’s not going to solve the problem.

Any help would be most appreciated.

 

[A800]

I had good experiences with Meanwell LRS PSUs.

 

[Wrayster]

I had good experiences with Meanwell LRS PSUs.

Thanks for the reply, helpful to know it would work with the LRS but I don’t think I’ll have space in my enclosure.

 

[chips666]

https://www.mouser.be/ProductDetail..._WXS3duZ6_ZMTXQO8ULqXE0c9OYiZHvMaAiI3EALw_wcB

This is the one i use
Enjoy....

 

[A800]

Another idea:
If it doesn't work, return it?

 

[chips666]

Wrayster,
When i looked at your picture i noticed both prints are not grounded to chassis
looks like you used plastic feet
Enjoy...

 

[Wrayster]

Wrayster,
When i looked at your picture i noticed both prints are not grounded to chassis
looks like you used plastic feet
Enjoy...

Well spotted, you have certainly taken a good look. I’ll try grounding both boards

 

[Wrayster]

Wrayster,
When i looked at your picture i noticed both prints are not grounded to chassis
looks like you used plastic feet
Enjoy...

I just grounded both boards and this has drastically reduced the noise. I have to turn my pre amp to full volume to here just a slight amount of noise. Thank you so much for the advise chips666, God bless ya!

 

[chips666]

I just grounded both boards and this has drastically reduced the noise. I have to turn my pre amp to full volume to here just a slight amount of noise. Thank you so much for the advise chips666, God bless ya!

 

[Ryogo]

@Wrayster
I see you're using RCA inputs and PE is connected to chasis, I'd highly recommend you to take a look at Hypex NC400 datasheet:

Note: in my case using 4.7R instead of 100R helped to eliminate all the noise across entire range of volume pot.

 

[beren777]

Thought I'd put my question here instead of starting a new thread for the same product:

Does the board have a speaker protection circuit? If not, what would you recommend? I understand that the TPA3255 IC has some built-in protection if balanced connections are used.

 

[turion64]

Just wanted to inform you all of my experience with using the 3eAudio 46V SMPS that I bought a few years ago. I also bought a 3eAudio 3255 based amp (like the picture in the original posting) as well as one of 3eAudio's 36V SMPS (all purchased on 3e's website). BTW, the 46V version is no longer offered on their website as of two years ago?

I was using the the 46V SMPS to originally power the JLE Electronics (www.jlelectronicsph.com) TICORE260BTL and then the updated version called the SYLPH-D200. I was just never pleased with the sound of either of these 3255-based amps. So I was opamp rolling (with hopes of finding some magic with the sound with the SYLPH amp) and noticed that with some opamps I was getting some minor whining out of the SMPS when some of the opamps were placed into the amp's sockets (even with no input signal). I never got this sort of behavior out of the 36V SMPS with the 3eAudio 3255 amp. A large number of folks really liked Lester's SYLPH amp so I took a chance and assumed the PS was troublesome. I had purchased a 36V SMPS from Connex Electronics for a different purpose (connexelectronics.com; SMPS300RS) and decided to try it with the SYLPH. The sound coming out of the amp was amazing now. Airy, solid defined bass, and there was no noise issues when rolling through the same opamp. Zero noise coming out of my speakers when no signal was fed into the inputs.

So, either I got a bum unit or the original design was not quite right. Anyway, I can recommend the Connex 300RS.

Cheers, Pete

 

[ai1]

... I had purchased a 36V SMPS from Connex Electronics for a different purpose (connexelectronics.com; SMPS300RS) and decided to try it with the SYLPH. The sound coming out of the amp was amazing now. Airy, solid defined bass, and there was no noise issues when rolling through the same opamp. Zero noise coming out of my speakers when no signal was fed into the inputs.

So, either I got a bum unit or the original design was not quite right. Anyway, I can recommend the Connex 300RS.

Cheers, Pete

I second: SMPS by connexelectronics.com seem to be of good quality. I have built a 12ch amplifier using three 4-ch TPA3251 modules from 3e-Audio withConnex SMPS800RS supply (32V) 3 y. a.. It works just fine ever since--no noise, no other problem.