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Class D Switching Power Amplifiers and Power D/A conversion |
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#71 | |
diyAudio Member
Join Date: Aug 2012
Location: Germany near Munich
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Quote:
You also need to add around 9dB gain because of post filter feedback configuration. Regular Smartphones have a output level between 0.7V - 1V(rms). I needed to fit my gain chain to the DSP which has a output of 0.9V(rms) but in fact I prefer to not go obove 0.7V(rms). Low noise for me is a noisefloor of -100dB and better. I will make some measurments and post them tomorrow evening. |
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#72 |
diyAudio Member
Join Date: Aug 2012
Location: Germany near Munich
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Attached the measurment of preamp.
My setup Sig Generator ----------------------------------------> DSP ----------------------------------------> Preamp Out 0.46V/0.65V(rms/pkpk) ----------------------------- Gain: 0dB ------------------------------------ 3.28V/4.634V(rms/pkpk) This ends up in a gain of 17dB just for the preamp stage. I was a bit confused first because the gain must be 15.7dB but then I realized that I took a bit different resistor values as in schematics ![]() CH1 is measured at the output of DSP, CH2 at the output of Preamp. FFT Plot is for CH2.
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Last edited by mantabernd; 9th March 2017 at 11:10 PM. |
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#73 | |
diyAudio Member
Join Date: Oct 2014
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Quote:
another question is that there are also many cost effective material from china,but you need some time to source.
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#74 | |
diyAudio Member
Join Date: Aug 2012
Location: Germany near Munich
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BT module is from bluegiga:
WT32I-A-AI6-APTX Quote:
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#75 |
diyAudio Member
Join Date: Aug 2012
Location: Germany near Munich
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Some more pics and measurments:
FFT Ampout 1W@4Ohms
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THD+N 0,009% | 10W@4Ohms from a 162mV(rms) source
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THD+N 0,86% | 224W@4Ohms from a 763mV(rms) source
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Amp from the back
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Amp from the side
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Amp from the front
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#76 |
diyAudio Member
Join Date: Sep 2004
Location: Northland, New Zealand
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Nice work!
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#77 |
diyAudio Member
Join Date: Dec 2009
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Looks pretty neat!
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#78 |
diyAudio Member
Join Date: Sep 2009
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Hi Bernd,
is this still in development? Always looking for good all-in-one packages for my next boombox build! Cheers, Robin |
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#79 |
diyAudio Member
Join Date: Oct 2015
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I like a lot what you have done. price is understandable idk for myself, would like it a lot... finishing boxing new TPA325* boards i’ve already got, hmm.... ooww....
Ive been following a chap that has been progressing making products in china and how he designed the products using cheap, ready available components. been quite interesting to read the details... anyway with potential interest in a batch, maybe he can put you in contact with good Chinese people that could help do a production run and get better component pricing, production optimisations, etc ![]() i made a pledge to the crowdfund he ran/running Earth-friendly EOMA68 Computing Devices | Crowd Supply Rhombus-Tech Mailing list best place to ask: The arm-netbook Archives hes lkcl on the net/maillist/irc. His info: Visionary - Technology - Poems - Stuff |
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