Hello,
Managed to sort the noisy 12v amp supply for the DSP, thanks to @FogAudio earlier post, made me curious about testing the pins in the SE -> Diff configuration at the input and BAM! it works, no more noise from the BT module! So now working in balaced (XLR-like) config. Clean sound! Nice sound!
Managed to config the dsp to output to DAC0, DAC1 the full sound but no bass and treble adjustments yet, only volume works.
Glad to hear the SE -> Diff jumper reconfig worked for you!
Clip OTW, FAULT and RESET are directly from pins on the 325x chip (I believe) and intended to be used with LEDs. The TI 325x datasheets will give you the full pin specifications. You can also find example sub-circuit schematics for clip and fault lines in the TI datasheet for their 325x EVM boards.
The reset pin can be GNDed, I did it via a switch and a pull down resistor of 1k I think, copying the example on the EVM schematic. I didn't bother with the error lights personally.
So the GNDed state of the reset line means the amp is powered on but silent. So with just a switch to GND via pulldown resistor, for example, you would engage reset before turning power on and off to eliminate switching transients etc. You could also use this in combination with a delayed power-on relay with the NC (normally closed) contact connecting the reset line to GND.
Certainly a reset/mute switch is easy to do and worth having even if you don't get any more elaborate.
Thanks Ytheleus. Really appreciate the feedback on the reset/mute switch.
Thanks can you please be a little more specific what exactly did you do? Sorry I’m new to this
All of the 3EAudio boards have an option for single-ended (unbalanced RCA input) or differential (balanced XLR input). On the 480 Watt amp, there is a set of pins labeled J2 and SE on one side and DIFF on the other. He was able to
Yup, I would be interested to get some boards too. I was out of the country for a few weeks in Feb and forgot to place the order before leaving
Yes I am ready to buy at least 2X EAUMT-0140-2-A too.
plz try eBay now is active.Yes I am ready to buy at least 2X EAUMT-0140-2-A too.
source switch can be set inside DSP.Maybe this has been posted somewhere here, but I have a few questions about the DSP and Bluetooth board:
- How does one switch between Bluetooth audio and external audio source through the RCA in?
- How can I wire outputs for SE rather than balanced?
use OUT+ and GND is single end out,but the output level is half.
I went overboard trying to mod my TPA3250EVM board (automute mod, separate linear 12V supply for VDD, extra caps to AVDD) and I just killed it.
I have gone to a lot of trouble to prepare a chassis, containing a 32V Connex SMPS within a separate metal shield, so I will go ahead and buy another amp board ...
but your opinions, please; would the 3eAudio 3251 board be equally suitable for me?
As well as my existing 32V supply, bear in mind that I will be driving MarkAudio fullrange speakers at low-to-moderate listening levels.
Thanks in advance.
I have gone to a lot of trouble to prepare a chassis, containing a 32V Connex SMPS within a separate metal shield, so I will go ahead and buy another amp board ...
but your opinions, please; would the 3eAudio 3251 board be equally suitable for me?
As well as my existing 32V supply, bear in mind that I will be driving MarkAudio fullrange speakers at low-to-moderate listening levels.
Thanks in advance.
plz try eBay now is active.
what about 3channel amplifier, dont see them available?
plz try eBay now is active.
Can you give us a link to the ebay listings as I cant see any 3eaudio products currently on ebay ???
Is there any plans for another group buy ??
Can you give us a link to the ebay listings as I cant see any 3eaudio products currently on ebay ???
Is there any plans for another group buy ??
Here you go:
https://www.ebay.com/sch/3e-audio/m.html?item=333125278726&oid=332371651072&rt=nc&_trksid=p2047675.l2562
It would be excellent news if DIY Audio were to arrange another Group Buy as there seems to be lots of people on this thread who like myself missed the Group Buy earlier this year.
For the DSP Pre-Amp I would like the one with the remotely connected controls as this makes it easier to fit in a variety of cases and has RCA connectors !!
Connecting the TPA3251 2x140W to one speaker?
Hi all,
Q1: Can I configure the TPA3251 2x140W 2Ch Class D Audio Amplifier (EAUMT-0140-2-A) to one speaker and use two of them to drive each of my speakers?
Q2: Can I configure the TPA3251 2x140W 2Ch Class D Audio Amplifier (EAUMT-0140-2-A) to drive drive one speaker that has two sets of inputs, one for the Tweeter and one for the Mid/Bass?
Hi all,
Q1: Can I configure the TPA3251 2x140W 2Ch Class D Audio Amplifier (EAUMT-0140-2-A) to one speaker and use two of them to drive each of my speakers?
Q2: Can I configure the TPA3251 2x140W 2Ch Class D Audio Amplifier (EAUMT-0140-2-A) to drive drive one speaker that has two sets of inputs, one for the Tweeter and one for the Mid/Bass?
Q1. Different with TI TPA3251EVM which allow mode selection from Single end 4ch/BTL 2 ch/PBTL 1 ch, 3e has optimized their EAUMT-0140-2-A circuitry in 2ch only, would be difficult to tweak the board into PBTL. TPA3255 1ch board x2 shall be suitable for your need or jump to TI EVM board if you willing to pay for more.Hi all,
Q1: Can I configure the TPA3251 2x140W 2Ch Class D Audio Amplifier (EAUMT-0140-2-A) to one speaker and use two of them to drive each of my speakers?
Q2: Can I configure the TPA3251 2x140W 2Ch Class D Audio Amplifier (EAUMT-0140-2-A) to drive drive one speaker that has two sets of inputs, one for the Tweeter and one for the Mid/Bass?
Q2. Yes, it works fine in bi-wire connection. Could also consider the 3255 2ch board if speakers are in 4 ohms imp or the sensitivity is low.
I assembled my amp and power supply into this case. The boards are next to one another and I'm getting a whine from the large transformer in the power supply as well as left channel of the amp (the channel closer to the transformer). Any suggestions on how to resolve this?
Thanks,
Nate
Thanks,
Nate
Finally I'm also listening to 2x 3255 + dsp board; the sound is great!
Can anyone share the default settings of the dsp board?
X-over frequency, maybe any gain settings? Is it possible to modify the bass control so it cuts out completely? (now it doesn't)
Has any put a on/off switch to the Bluetooth module? Is that done by bending out the power-pin and adding a switch or is there a nicer solution?
Can anyone share the default settings of the dsp board?
X-over frequency, maybe any gain settings? Is it possible to modify the bass control so it cuts out completely? (now it doesn't)
Has any put a on/off switch to the Bluetooth module? Is that done by bending out the power-pin and adding a switch or is there a nicer solution?
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- Group buy: TPA3251_TPA3255 Amplifier board and ADAU1701 DSP Pre-Amp board