Any more thoughts on a DAC and display for the CDPRO 2 as your next endeavour? Even if you were to design and layout the PCB's and treat it as a custom order with the interested parties sharing the costs?
Anthony
Anthony
Re: Kits are boxed up
😱
That's works perfectly, with my receint Lamdba Acoustics woofer order. I ordered a pair of 15" woofers for a dipole bass experiment, and one arrived with the steel phase plug rattling around in the cone beating up the VC former and the cone itself.
That sounds great, I'm anxiously awaiting the parts. I'll take lots of pictures of my build-up and active crossover implimentation for your site.
Sheldon
harvardian said:Oh by the way, I did run out of parts just before kitting Sheldon's kit. Sorry...
😱
Just kidding
😱
That's works perfectly, with my receint Lamdba Acoustics woofer order. I ordered a pair of 15" woofers for a dipole bass experiment, and one arrived with the steel phase plug rattling around in the cone beating up the VC former and the cone itself.
That sounds great, I'm anxiously awaiting the parts. I'll take lots of pictures of my build-up and active crossover implimentation for your site.
Sheldon
Shipped
<h3>Shipping is complete!</h3>
As they say in Texas!
Yee Haw.
Dale and I just shipped all of the boxes.
What a relief!
Anthony,
We are still thinking about the CD-PRO2.
We are currently trying to finish up the APOX-3, APOX-SHM
and APOX-DK. But I think we are getting pretty close to completion.
-Craig
<h3>Shipping is complete!</h3>
As they say in Texas!
Yee Haw.
Dale and I just shipped all of the boxes.
What a relief!
Anthony,
We are still thinking about the CD-PRO2.
We are currently trying to finish up the APOX-3, APOX-SHM
and APOX-DK. But I think we are getting pretty close to completion.
-Craig
Re: Shipped
Thanks for your consideration guys.
dipchip said:<h3>Shipping is complete!</h3>
As they say in Texas!
Yee Haw.
Dale and I just shipped all of the boxes.
What a relief!
Anthony,
We are still thinking about the CD-PRO2.
We are currently trying to finish up the APOX-3, APOX-SHM
and APOX-DK. But I think we are getting pretty close to completion.
-Craig
Thanks for your consideration guys.
apox 3
what happened to the "alw regulators"....?
the regs should be "better" and there should be a seperat reg for the opa134 and the buf634........🙂
what happened to the "alw regulators"....?
the regs should be "better" and there should be a seperat reg for the opa134 and the buf634........🙂
APOX-3
Well to try to get the maximum noise immunity. I Opto-isolated the PGA2310 from the microcontroller. I also added a voltage regulator for the +/-15v and +5v for the PGA2310.
I was also assuming people would supply a regulated +/-18V supply to the board. This double regulation should provide very good PSRR.
Do people still want the Jung regulators
So lets have a vote.
1.) Leave the board like it is.
2.) Put Jung regulators for the +/-15v
The Jung regulators will make the board have quite a large number of parts but should provide very high quality audio.
I was also thinking of breaking up the board into a single channel.
That way there would be no crosstalk, and an identical seperate board should have identical performance. And each chip would have its own regulator.
-Craig
Well to try to get the maximum noise immunity. I Opto-isolated the PGA2310 from the microcontroller. I also added a voltage regulator for the +/-15v and +5v for the PGA2310.
I was also assuming people would supply a regulated +/-18V supply to the board. This double regulation should provide very good PSRR.
Do people still want the Jung regulators
So lets have a vote.
1.) Leave the board like it is.
2.) Put Jung regulators for the +/-15v
The Jung regulators will make the board have quite a large number of parts but should provide very high quality audio.
I was also thinking of breaking up the board into a single channel.
That way there would be no crosstalk, and an identical seperate board should have identical performance. And each chip would have its own regulator.
-Craig
Re: APOX-3
A couple of questions:
what type of opto-isolators do you use?
what are you doing for the opamps?
Also, for splitting up the channels, you could make it so that 1 board would work for either 2 channels single-ended, or 1 channel fully differential.
Can you post a new schematic when you have a chance, with the regulators?
--
Brian
dipchip said:
A couple of questions:
what type of opto-isolators do you use?
what are you doing for the opamps?
Also, for splitting up the channels, you could make it so that 1 board would work for either 2 channels single-ended, or 1 channel fully differential.
Can you post a new schematic when you have a chance, with the regulators?
--
Brian
I have a wondering about the opamp input protection: Why use 1N4004 diodes? For me it seems more natural to use a plain signal diode like 1N4148.
Any guestimate what the cost will be for the APOX-3? I realize that it's still in flux...
I have an Abuquerque Speaker Society (***) meeting next week, and I've been telling some people about these boards and the potential. I'll let them know about the new developments.
Sheldon
I have an Abuquerque Speaker Society (***) meeting next week, and I've been telling some people about these boards and the potential. I'll let them know about the new developments.
Sheldon
peranders,
Yes, your probably right. I'll change them to the 1N4148 variety.
I guess I was thinking of higher power applications.
Also I'd like to publically thank ALW for kindly giving me permission to offer his jung regulator boards for sale. (outside the U.K. (that's his turf!))
What I may do for the Apox-3 is give the option for on-board
linear regulators, or external Jung regulators?
That way people can get as fancy as they want!
I am also thinking that maybe the Headphone amplifier should be a seperate board as well. The APOX-3 would still offer the output switching for the headphones! I am trying not to limit peoples ability to configure their system like they want.
Anybody have thoughts on this approach?
Sheldon wrote:
Sheldon, I'll work with Dale on Monday to try to figure out the final configuration of the APOX-3. By offering a choice of the Jungs or the linear regulators. Hopefully we can please most peoples price points.
Dale's probably busy right now trying to smooth things over with his wife for Mother's Day. I'm about to take my wife and kids out to dinner before she bites my head off. How come wives don't like it when you work at home? (I thought it was better than sleeping on the couch all day, but apparently it isn't! )
Oh well! I'll never understand the opposite sex!
-Craig
Hello Everyone,
Sheldon,
The cost of the APOX-3 will probably be a wash with the other boards once you factor in resistors. The PGA devices will wash with the relays. Now, since I convinced Craig to use single op-amps, you can greatly increase the cost by using OPA627's or similar. Also, we greatly appreciate the "press". Thanks! Also, if you do not want the headphone option, many components are not needed.
Peranders,
I think that Craig just uses values as place holders for components. The OPA134 opamp could be substituted with quite a few other values, as is the case with the diodes. Our final BOM will contain real components.
Brian,
The optos should not be very important. The timing requirements are not very critical and we are supplying the clock for the SPI. I think that Craig is using a very high speed (> 1MHz) device made to be used in digital logic.
I took a much needed reprieve from this project and started to re-do a large deck. Nothing like breaking up wood with a large hammer to let out some stress...
Dale
Sheldon,
The cost of the APOX-3 will probably be a wash with the other boards once you factor in resistors. The PGA devices will wash with the relays. Now, since I convinced Craig to use single op-amps, you can greatly increase the cost by using OPA627's or similar. Also, we greatly appreciate the "press". Thanks! Also, if you do not want the headphone option, many components are not needed.
Peranders,
I think that Craig just uses values as place holders for components. The OPA134 opamp could be substituted with quite a few other values, as is the case with the diodes. Our final BOM will contain real components.
Brian,
The optos should not be very important. The timing requirements are not very critical and we are supplying the clock for the SPI. I think that Craig is using a very high speed (> 1MHz) device made to be used in digital logic.
I took a much needed reprieve from this project and started to re-do a large deck. Nothing like breaking up wood with a large hammer to let out some stress...
Dale
I like the board options you have described. Price is a big factor, but most of us don't mind buying a "gift" for our audio system now and again. Better to add the Jung regulators later than the latest snake oil tweak.
Also, this means the headphone amp can be used with any boards? (w/ manual switching)
I'll bet a lot of people buy in on the cheap and then get addicted!😉
Also, this means the headphone amp can be used with any boards? (w/ manual switching)
I'll bet a lot of people buy in on the cheap and then get addicted!😉
regarding the headphone amplifier. It might be best to not put the relay on the apox3 board for this, but instead put it on the pcb with the headphone amplifier, then you can use it with any of the volume control boards, simply by putting it in the audio path.
just a suggestion...
--
Brian
just a suggestion...
--
Brian
BrainGT,
Thanks, thats a great idea! I think I will put a very small microcontroller on board to switch on the headphones with the APOX-IR1, and also have a switch input for people that want to use the board stand-alone (like Variac?)
I am also speaking to ALW about letting me make his board into a SIP package. That way the regulators will stay close to the action.
-Craig Beiferman
Input: Grounding will be very important for this scheme to work well. I recommend having the Apox-3 set up with floating power supply and force ground it to the analog circuit.
As a "passive", there will not be the same design concerns of course.
Petter
As a "passive", there will not be the same design concerns of course.
Petter
Actually, I just wanted to be able to use headphone selection and amp with any of the APOX approaches, since I might not go with the APOX 3.
It did also occur to me however, that if you broke it out of the board, you would have a stand-alone product. Just add power supply?
It did also occur to me however, that if you broke it out of the board, you would have a stand-alone product. Just add power supply?
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