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Post by Deleted on Mar 20, 2019 23:01:31 GMT
They are still at the original spec as advised by the designer of the output boards, I just like them run hotter. and as you know with your B1 a lotter hotter is better. Ah ok, i wasn't aware of that but yes, you are absolutely right. Hotter the better indeed. The DCB1 benefitted on every step up the mA range we went. 1.2A is as good as i can get because of the build. I'd love to see what happens at 2.5A!  |
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Post by sq225917 on Mar 21, 2019 9:30:57 GMT
It probably melts
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Post by Deleted on Mar 21, 2019 12:03:08 GMT
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Post by sq225917 on Mar 22, 2019 19:58:56 GMT
and the finished item, lid still off.  and the undercarriage lighting for each of the four psu rails.  |
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Post by Deleted on Mar 22, 2019 22:11:56 GMT
and the finished item, lid still off. and the undercarriage lighting for each of the four psu rails. Is copying the highest form of flattery? Superb work. I love those leds. Superb. |
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Post by sq225917 on Mar 22, 2019 23:00:48 GMT
They were a total pita because I left adding the trailing wires until last, literally no way to solder them in from above. Had to solder them below then reassemble. Lesson learnt for next time...
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Post by Deleted on Mar 24, 2019 8:38:57 GMT
They were a total pita because I left adding the trailing wires until last, literally no way to solder them in from above. Had to solder them below then reassemble. Lesson learnt for next time... Did you just relocate an Led from the board rather than add them additionally? I know you can pinch the feed from elsewhere but that seems like the easiest option? |
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Post by scotty38 on Mar 24, 2019 8:47:03 GMT
What is the purpose of the leds inside the case?
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Post by sq225917 on Mar 24, 2019 19:37:59 GMT
I relocated one led from each side of each pcb.
The leds are all used as constant current sources, the six under the heatsink provide a constant current reference for the front end of each +/- rail on the shunt and the long strings of six either side of the heatsink provide the same, but at 2.5x the current for the back end. The CCS could have been made in a number of different ways but multiple LEDs are quieter then even the best zener voltage reference and allow you to stack them to get an optimum value.
The fact that the four that are used to illuminate the under-carriage come from the back end of the shunt means that once these are lit it's safe to drop the needle. They slowly illuminate as ther shunt regs come up to full power, so once they're lit you're good to go.
and yes, that particular brand of green led are the quietest. There's a red that's just as good but consumes lower current so needs and extra LED in the string, for which there's no provision on the pcb and some adjustment of resistors in the front end of the shunt.
After all that I'm waiting on a couple of 30r 30 watt caddock T220 case power resistors to drop the PSu down to the optimum 26.5v. SO it's unlikely to be completely finished until Wed/Thursday.
Still, all good things....
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Post by scotty38 on Mar 24, 2019 22:00:04 GMT
Thanks for that, quieter than other methods hadn't occurred to me.
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Post by sq225917 on Mar 27, 2019 22:05:12 GMT
And she's off to her new home.
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Post by Deleted on Mar 27, 2019 22:31:32 GMT
And she's off to her new home. Another owner will be satisfied I'm sure. Any more on the horizon? |
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Post by sq225917 on Mar 28, 2019 11:15:45 GMT
I have one with 95% populated boards, just needs the RIAA resistors selecting and fitting. It'll need a PSU as well.
I've got two potential buyers interested in it, I think it's probably a case of whoever demo's it first will take it, that's usually the way of things.
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Post by Deleted on Mar 28, 2019 17:59:26 GMT
I have one with 95% populated boards, just needs the RIAA resistors selecting and fitting. It'll need a PSU as well. I've got two potential buyers interested in it, I think it's probably a case of whoever demo's it first will take it, that's usually the way of things. Good luck with it! Not that you'll need it. They do seem to get snapped up pretty quickly. |
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Post by Deleted on Mar 31, 2019 12:16:58 GMT
I've heard one of these a couple of times and always remarked on how lovely they sound.
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