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Group buy: TPA3251_TPA3255 Amplifier board and ADAU1701 DSP Pre-Amp board
Group buy: TPA3251_TPA3255 Amplifier board and ADAU1701 DSP Pre-Amp board
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Old 15th April 2019, 07:30 PM   #281
Mindfunk is offline Mindfunk
diyAudio Member
 
Join Date: Dec 2015
@3eaudio
thanks for the answer and the photo, now it is clear!
in Post 264 you describe the change of the cap to use an external antenna, which size (farad) has the cap.
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Old 15th April 2019, 09:09 PM   #282
Medisinmannen is offline Medisinmannen  Norway
diyAudio Member
 
Join Date: Jan 2015
Location: North
I am having noise issues with my dsp board. It is setup with a modified version of 3e's sigmastudio, using single ended (+ and gnd) to an chipamp. Constant clicking noises, but much louder/different noise under BT playback. Also mounted an antenna and played around with i2s settings, but that did help. Also tried an usb power source.

Source of noise is BT module. When it is unplugged, clicking noises is gone. In this thread, someone wrote that using balanced output was a cure. Will adding a "balanced to SE" module help?


Not loving the locked modules in sigmastudio, but i understand. Could 3e supply an auto on/off module, so i can turn off amp when no signal is present?
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Old 21st April 2019, 06:46 AM   #283
jimk04 is offline jimk04  United Kingdom
diyAudio Member
 
Join Date: Jul 2018
Location: North Notts
I have the 3 channel 3251 board. All the components seem to he populated for 4 channel operation except for the output inductors.

Can I enable it into 4 ch mode by adding the inductors?
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Old 21st April 2019, 07:52 AM   #284
cacao ambiance is offline cacao ambiance  United Kingdom
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Join Date: Oct 2015
@jimk04 no. the 2rd amp is in bridge mode. its using both channels for the double power output.
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Old 21st April 2019, 08:13 AM   #285
jimk04 is offline jimk04  United Kingdom
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Join Date: Jul 2018
Location: North Notts
Thanks
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Old 22nd April 2019, 11:09 AM   #286
manudrz is offline manudrz  France
diyAudio Member
 
Join Date: Feb 2012
Location: Fougères
Hi, mine is working perfectly

But I'm wondering if it would be possible to feed it directly with the voltage outputs of a Wolfson DAC? No buffer, differential DAC output into the JRC4580... Or any advice about feeding these TPA with Wolfson 8742 ?
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