Thread edited to keep chronological order of moved posts.
Introductory note from Jan carried forward from old thread.
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Hi anatech,
XR2206 looks like the go, thanks! It's times like this that I regret not buying the -S model when I bought my Rigol scope.
Jan,
In your note above you mention a source that can provide 10kHz, 100kHz at ~ 10V ideally for calibration. The cheapo XR2206 kits seem to be set for 2V sine wave output. The datasheet has mention of changing a resistor and increase supply voltage to 25V to get more voltage out so no worries there. I don't want this thing to cost any more ($$ or time) than it needs to, should I care about the 2.5% distortion for this purpose? Or should I look for something a bit more sophisticated?
Regards,
Chris
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The calibration for the autoranger can also be done with, say, 50kHz with probably same results - it's only an octave lower.
Lower level than 10V works also well, if you have a good RMS multimeter that works down to say 20mV.
The procedure is universal, and the measurements are comparatively, not absolute.
Source distortion is no issue.
I wouldn't start buying test equipment for this yet!
Jan
Lower level than 10V works also well, if you have a good RMS multimeter that works down to say 20mV.
The procedure is universal, and the measurements are comparatively, not absolute.
Source distortion is no issue.
I wouldn't start buying test equipment for this yet!
Jan
I have been looking at a kit consisting of:
- Painted and labelled enclosure;
- Complete assembled and tested SilentSwitcher power supply;
- Attenuator/amplifier PCB;
- Control PCB;
- Programmed controller.
and that would probably come close to € 150.
Jan
Yes but that is with minimum orders of 50 for everything except the controller ;-)
Maybe do a Kickstarter?
Then I can include some turn-key sets too for those who don't want to do the soldering etc.
I don't want to make money but I also don't want to get stuck with $ 2000 worth of shiny boxes...
Jan
Maybe do a Kickstarter?
Then I can include some turn-key sets too for those who don't want to do the soldering etc.
I don't want to make money but I also don't want to get stuck with $ 2000 worth of shiny boxes...
Jan
As far as I can ascertain the board layout and parts list are complete to achieve the design specifications so, imho, it would be unfair to expect Jan to start redesigning anything at this point in time...
Yes that is correct. Just today talked to the outfit that did the enclosure prototype about getting a bunch made. You know, like drop the display window 0.5mm, raise the switch hole 1mm and decrease diameter 0.2mm, that sort of thing 😎
Now I have to decide if I want to commit a couple of grand to get it going.
If any of you have plans (or make any after reading this 😉) of visiting RMAF this fall, I'll have a fully operational prototype to check out.
Jan
Hi Jan,
sorry for a couple of questions🙂
Have you had the chance to take some photos of the PCBs?
Is there any chance to share the schematics of the AutoRanger with us?
What are the costs (approx.) for the components needed for the full kit?
Michael
sorry for a couple of questions🙂
Have you had the chance to take some photos of the PCBs?
Is there any chance to share the schematics of the AutoRanger with us?
What are the costs (approx.) for the components needed for the full kit?
Michael
Photos already posted...
http://www.diyaudio.com/forums/equipment-tools/231401-quantasylum-qa400-qa401-217.html#post4812938
Projected kit price seems to be around €150...
Thank you MarkS for pointing me to the pictures. I know the kit price is €150, I am asking for the costs of the electronic components which will add to the kit costs.
Michael
Michael
Probably another $ 120 to $ 150. Depends a bit for instance on the display type you want to use. There are three single (or a dual and a single; there's sockets for both) opamps; I am using NE5534's but you can live it up there.
There are 9 1-form-A reed relays; I have been using both Pickering at $ 5 a pop as well as Coto 9007 series at $ 1 each. Doesn't seem to make a difference. The Pickerings will probably last longer (like 100 million switches versus a mere 5 million or so ;-).
My equipment (dScope series III) cannot measure better than about -118 dB distortion on a good day; and there's basically no difference between the loop back and with the autoranger inserted.
Jan
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There are services in Asia that will build the complete PCB for not much more than the cost of the parts. At 50 pcs. its a good number to pursue. There are shops near me that could handle the PCB assembly as well but I'm a very long way from you.
Typically getting a PCB with the passives SMT mounted and the more modest parts (opamps) costs a small increase over the the basic PCB. Then let us mount expensive chips and connectors. it keeps the up front costs lower but addresses the most tedious part of assembly.
Typically getting a PCB with the passives SMT mounted and the more modest parts (opamps) costs a small increase over the the basic PCB. Then let us mount expensive chips and connectors. it keeps the up front costs lower but addresses the most tedious part of assembly.
Yes that's a possibility I am pursuing. But most of the SMT Rs are 0.1% 25ppm or so and that's not something they have in the parts bin, so they need to order specially for this project. Which is not something they like!
Jan
Jan
QuantAsylum QA400 and QA401
Jan, I can provide a source in China that will allow you to deliver your own parts. You can see the LSK389 in these pictures - in fact, I supplied the entire BOM. They even included little QC stickers and stuck them in individual static bags 🙂 The quality was okay - I did the prototype boards using stencils and my boards seemed to come out a bit better.
In the end, I was lazy and needed a bunch of these boards
I would be glad to assist anyway I can - feel free to hit me up via PM
Jan, I can provide a source in China that will allow you to deliver your own parts. You can see the LSK389 in these pictures - in fact, I supplied the entire BOM. They even included little QC stickers and stuck them in individual static bags 🙂 The quality was okay - I did the prototype boards using stencils and my boards seemed to come out a bit better.
In the end, I was lazy and needed a bunch of these boards
I would be glad to assist anyway I can - feel free to hit me up via PM
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Good tip, thanks!
I got a few hours in front of an AP 2722 yesterday with the proto autoranger (thanks Guido Tent!) but it was somewhat disappointing - no difference between loop back and with the AR in the loop, except a slightly higher baseline noise. 😎
Red is loopback.
Jan
Hi Jan
Nice work. You can also attach the AP File as some one with AP2700 software can open and expand as needed (Demo mode).
Duke🙂
Hi Demian The level is dBv
Nice work. You can also attach the AP File as some one with AP2700 software can open and expand as needed (Demo mode).
Duke🙂
Hi Demian The level is dBv
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