I'm in for an all in one board with a separate supply board. I want to do a chassis for it with the supply in a Mu-Metal can.
Yes the Chinese supply sucks a$$. We did better on the crossover. 3 LM317s and a couple cheap caps.
The crossover is not as "picky" , just analog bass.
Speaking of the sub , we could also add a "sub out" to the line stage.
A simple summing op-amp at the line stage out.
Or , add that simple diamond buffer ... an op-amp with the buffer is high Z
and will always be close to sub-ppm.
OS
Did it work well for you? I'd like to add all the extras. A nice LCD display would be good. I want to control it from my phone too, but my phone has an IR emitter so that's not too hard. Network interface would be nice too.
OS,
Looking good and could fill my needs, have a DAC (Chinese board with WM8740) for which im looking to add a buffer in order to have a volpot in between. The DAC board already has an opamp at the output.
I’ll wait and see if something develops over this project.
I have followed this thread since the beginning drooling over each page, excellent effort from you and all the builders. Thank you again.
Antonio
I think the digital and analogue sections should be on independent supplies. Mine shares 15-0-15 and a 9V transformers.
Do you want to put the crossover on board as well or keep it in the sub?
Absolutely ! , the 60$+ chinese ones split digital/analog PS's .. at least !
A buffered sub out is low Z , ok to let the sub eq do everything.
Could just do a 6db/oct 500Hz LPF with a switch (it could double as a
center channel). ..... unique !!
Jeff , there is a lot of advanced pga32xx material here -
http://www.diyaudio.com/forums/analog-line-level/167977-volume-remote-control-module-pga-2311-a-3.html
Looks like linuxworks made your comment , Jeff (post 7).
Also looks like he went commercial with his atmega328 LCD module (below)
it is "gone".
All the other "line level" people are just "beatching" about the chinese junk.
Only a few designers (that keep it all to themselves).
We NEED to design an "open source version".
Edit - I was wrong - source and circuit is there ...
http://www.amb.org/audio/lcduino1/
OS
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I was just found code for an Atmega that remembers last setting. Mine is STI but I think it's all C .
I think we should just start from scratch anyway. There's plenty of examples of Arduino code. We just need to figure out how to make the different code operate together (That's where I have trouble).
The hardware it easy. We can do much better. Datasheets tell all that is needed for this sort of circuit. I don't understand why the Chinese can't read them and get the decoupling right.
I think we should just start from scratch anyway. There's plenty of examples of Arduino code. We just need to figure out how to make the different code operate together (That's where I have trouble).
The hardware it easy. We can do much better. Datasheets tell all that is needed for this sort of circuit. I don't understand why the Chinese can't read them and get the decoupling right.
JW - you are a man after my own tastes. Yep kids
will do anything...but given a good cause and
their VCS...yeee hawwww.
Who want's to start the thread ?
I see 3 main "sections"
1- PS and buffers ( analog and through hole).
Rock solid +/-5V , +- 15-24V
And a unregulated output to power on-board digital
3 and 5 V.
2- attenuation and display (smd)
3- DAC (could be on the digital PCB)
2 main boards ...
Inputs could be SS relays , btw.
OS
Now we feel like we belong here in LA.
We Spent about 1/2 the day stuck in traffic on The 5.
At least now the Berry Farm is out of the picture.
So now we are going to hang around Beautiful Downtown Burbank
and set to go see where all the Magic happens.
Then spend two and 1/2 hours driving around in circles in the
middle of the night as we drive w/in 2 miles of the hotel. The
GPS just couldln't figure it out.
Highlights were we sneaked the baby on the solo airplane ride
for kids only and she didn't cry like some of the bigger kids,
she only cried when we told her she had to wait in line to go
again.it
That and her first Merry go Round.
It was funny at 230 am I asked a guy in the drive through at the
Jack in the Box...he said to throw the GPS out, and drive down
the street 1 mile, turn right and the hotel is right there.
He was right. Saved again by local knowledge.
They had a DJ at the park and had a kids disco...like most
DJ stuff, it sounded like the speakers were blown...they was
playing through a 200 watt PA amp in open air that was
shirty loud with tonnes of distortion, so much so that even
the baby had to put her fingers in her ears.
Cheers,
We Spent about 1/2 the day stuck in traffic on The 5.
At least now the Berry Farm is out of the picture.
So now we are going to hang around Beautiful Downtown Burbank
and set to go see where all the Magic happens.
Then spend two and 1/2 hours driving around in circles in the
middle of the night as we drive w/in 2 miles of the hotel. The
GPS just couldln't figure it out.
Highlights were we sneaked the baby on the solo airplane ride
for kids only and she didn't cry like some of the bigger kids,
she only cried when we told her she had to wait in line to go
again.it
That and her first Merry go Round.
It was funny at 230 am I asked a guy in the drive through at the
Jack in the Box...he said to throw the GPS out, and drive down
the street 1 mile, turn right and the hotel is right there.
He was right.
Saved again by local knowledge. They had a DJ at the park and had a kids disco...like most
DJ stuff, it sounded like the speakers were blown...they was
playing through a 200 watt PA amp in open air that was
shirty loud with tonnes of distortion, so much so that even
the baby had to put her fingers in her ears.
Cheers,
They'll be shelling out more to their IT guy than the $20 they stiffed me for. Kids have no conscience.
If you've got something designed, go ahead and start it. I haven't got anything to show yet.
Is something like this http://www.mouser.com/ds/2/405/sles069b-127745.pdf what we should be using for a DAC or do you have something else in mind?
SMD for pF range C0G caps and X7R 0.1uf range caps, all other caps are through-the-hole. SMD film caps are expensive and not seem to offer advantage. Most film caps are bulky enough that you'd rather to anchor them good to a PCB with legs in holes.
That , or the ESSxxxx ones.
I'll start the thread "pitchfork preamp" in analog line.
1/2 our endeavor will be analog (including on-board analog on the digital
"side").
OS
Thread is started ...
http://www.diyaudio.com/forums/analog-line-level/272915-pitchfork-pre-amplifier.html#post4291217
TI seems competitive. ESS "fanboys do "drool" over the 9018 "sabre"..
OS
http://www.diyaudio.com/forums/analog-line-level/272915-pitchfork-pre-amplifier.html#post4291217
TI seems competitive. ESS "fanboys do "drool" over the 9018 "sabre"..
OS