I think I found my case...
HiFi Audio DIY Aluminum Chassis Aluminum Case - eBay (item 190353281526 end time Dec-27-09 07:38:50 PST)
20cm x 29.5 cm x 8cm internal dimensions.
I got to lay out my components and see if they'll fit.
I'd prefer to find something locally.
HiFi Audio DIY Aluminum Chassis Aluminum Case - eBay (item 190353281526 end time Dec-27-09 07:38:50 PST)
20cm x 29.5 cm x 8cm internal dimensions.
I got to lay out my components and see if they'll fit.
I'd prefer to find something locally.
That's great, just two resistors then. The voltage doesn't have to be exactly +/-15V, as long as it is >2.0V higher than the 12V output of the next regulator. 14.4V is a bit lowish, but the 4% tolerance of the LM337 and the 5% of the resistors could lead to 9% in total. If you want an exact voltage with LM317/337, it's better to use a trimmer instead of the 1k1.
The case looks good, but all the way from Hong Kong must mean $$$ shipping...
Ray
The case looks good, but all the way from Hong Kong must mean $$$ shipping...
Ray
These ones from Hammond (Guelph is pretty close to home, eh?) actually don't look too bad, though maybe not big enough if the power supply is in the same box.
Hammond Mfg. - Extruded Aluminum (Metal End Panels) - 1455 Series Enclosures
p.s. How's the weather there these days?
Should I use a couple of trimmers? I believe there 2x 1k1 on board.
I should use only the wiper and one end of the trimmer right?
If you'd like to tune the voltage, sure, but it's not really needed in this case. If you do, connect the free end of the trimmer to the wiper.
Ray
guys, I put my name down on the interest thread for this round of PCBs (2 x dac boards and a PSU) and I followed up as well. I have never received any reply or any indication of what to do. I have most of the parts sitting around and really wanted to see if I could modify one of these for portable battery operated use as well. what do I do?
Hi everyone, have a good 2010!
Battery operation for the ezDAC shouldn't be a problem. You can use two 24V batteries and the ezDual to regulate this down to 15V, and then feed that to the ezDAC board. The on-board regulators will provide the needed 3.3V, 5V and 12V. You will need to tie V1, V2 and V3 together.
Second approach would be to use two 12V batteries and no ezDual. I would tune the LM317 and LM337 for the opamps down to say 8V (that will still give plenty of headroom and allows for the batteries to run low) and connect them directly to the ezDAC board. Well, with a fuse in series of course
Ray
Battery operation for the ezDAC shouldn't be a problem. You can use two 24V batteries and the ezDual to regulate this down to 15V, and then feed that to the ezDAC board. The on-board regulators will provide the needed 3.3V, 5V and 12V. You will need to tie V1, V2 and V3 together.
Second approach would be to use two 12V batteries and no ezDual. I would tune the LM317 and LM337 for the opamps down to say 8V (that will still give plenty of headroom and allows for the batteries to run low) and connect them directly to the ezDAC board. Well, with a fuse in series of course
Ray
http://www.diyaudio.com/forums/group-buys/136169-ezdac-group-buy-interest-27.html#post1990658
I'm getting ready to send them out this week, so please get in touch soon. If you e-mailed me earlier, I'm sorry that I didn't get back to you. I've got a lot of plates to juggle these days.
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