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Power supplies
#1
I built a nice linear power supply using two 7805s, one for the Raspberry Pi and one for an Allo DAC. The DAC side worked fine, but a 7805 can't supply enough current for the Pi. So, I built a separate, well-filtered linear supply for the DAC and bought a 2.5 amp SMPS for the Pi. That's in place now and sounds great. I didn't think that I would like this streaming business that much, but I do. I haven't tried any of the other DACs or drivers but the stack listed below is quite musical.

Raspberry Pi 3 with 2.5 amp with SMPS
Allo Boss DAC 1.2 with regulated linear power
MoOde Audio 4.1 using the IIR filter
Lenovo Tab 3 as a controller
KT88 SE amp (ultralinear)
Transmission line speakers
Powered subs

I plan to redo my original supply with LM317s, which should deliver enough current to run th Pi.

This was fun!

Thanks,

      John
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#2
TL's and Subs are a great combo. What brands/models are u using ? I used to have a super rare set of DCM Time Window Squared speaks :-)

Allo's product line is leading edge. Watch for their upcoming Katana DAC and Nirvana PSU. Great stuff :-)
http://www.diyaudio.com/forums/vendor-s-...m-rpi.html

-Tim
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#3
(05-03-2018, 02:36 PM)Tim Curtis Wrote: TL's and Subs are a great combo. What brands/models are u using ? I used to have a super rare set of DCM Time Window Squared speaks :-)

Oh, the DCMs must have been nice. I am a diy type, so the t-lines are a design of my own based on a half Chili Chang design that was popular a few years back. I am using a 8" 'full range' drivers with a Linaeum tweeter bolted on top. No cross over, just a cap to roll off the tweeter. The subs are 10" front-firing Polks, one for each side. But the key is a derived center channel via the Hafler/Klipsch design running a small LX5.

Thoughts on the FIR or IIR setting for an Allo Boss?

Best,

    John
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#4
Thats a really nice minimalist design, plus the vintage 3-channel enhancement :-)

The DCM TW^2's had very complex x-over network [controls on back of head cab are High Frequency Dispersion, Mid Frequency Dispersion and Tweeter Level] but goal was similar to 3-channel, to produce more enjoyable "sound stage". The head cabs had front firing mid/high drivers and side-firing mid/high drivers (the "dispersion" feature). Interesting design.

The PCM 5xxx digital filter options seem to be more for Recording Studio applications ??? than end-user listening where things like EQ, Loudness and other DSP produce noticeable changes in the the sound.

-Tim
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