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Group buy: TPA3251_TPA3255 Amplifier board and ADAU1701 DSP Pre-Amp board

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F

FogAudio

Member
Joined 2012
Bulibasha said:
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! :D
Managed to config the dsp to output to DAC0, DAC1 the full sound but no bass and treble adjustments yet, only volume works.
Click to expand...

Glad to hear the SE -> Diff jumper reconfig worked for you!
 
F

FogAudio

Member
Joined 2012
Ytheleus said:
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.
Click to expand...

Thanks Ytheleus. Really appreciate the feedback on the reset/mute switch.
 
L

linuxfan

Member
Joined 2007
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.
 
B

bushellj

Member
Joined 2013
S

Sedim

Member
Joined 2019
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?:D
 
R

ricyuyc

Member
Joined 2006
Sedim said:
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?:D
Click to expand...
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.

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.
 
T

Think

Banned
Joined 2017
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?
 
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