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Post by Deleted on Jun 6, 2014 1:23:36 GMT
Presently, Greg and myself are investigating the possible use of half of a JLH PCB configured to use a voltage regulator instead of the Current Limiter section, to supply an internal SSD in a PC with ultra clean +5V power from an existing +12V feed in the PC. Greg's most recent JLH PCB design has a split in the earth rails to facilitate this, but you would probably need a fine hacksaw blade to do this, as the PCBs are quite tough, as Greg found out the hard way. For anyone who has a G.E. JLH PCB and would like to investigate this, a diagram is attached, but it has yet to be tested. Placing the voltage setting resistors under the PCB should permit the use of a reasonable size heatsink for the LM317T, and you could just scrape away the lacquer on the earth side to avoid needing to drill another hole in the PCB. With care in location you may also be able to drill 3 holes and fit a trimpot, being mindful of the need not to foul the heatsink. Perhaps it could even also be used to power a Logitech SBT from a 12V 1A plugpack, either Linear or SMPS, if the heatsinking is adequate ? Comments are welcome. Regards Alex
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Post by Deleted on Sept 21, 2014 2:28:10 GMT
The V Reg + JLH PCB has now been bench tested at .5A continuous with an output voltage of +5V derived from a +12V supply. The heatsink, which has an additional hole drilled in it to facilitate clearing the resistors, and it's mounting pins removed, is not too hot to keep your fingers on for 30 seconds or so. The electrolytic capacitor mounted across R111, has been relocated to under the PCB I intend using this PCB in my PC to supply a 120GB SSD , possibly with the Operating System on it . The idea is to reduce RF/EMI from the SSD getting back into other areas of the PC when ripping and playing CDs, and doing Audio format conversions etc. .
Alex
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Post by Deleted on Nov 25, 2014 4:34:46 GMT
This morning I finally got around to installing this +12V to +5v regulator with a JLH PSU Add-on, into my W8/64 PC to power a new Samsung 120GB EVO 840 SSD. Although it had been laying around for a while, it had previously had a couple of days powered up on the bench. Initial impressions are that it is more detailed and transparent sounding than even with the same tracks ripped and saved directly to a Corsair Voyager USB memory stick powered by an external +5V Linear PSU with a JLH using a modified USB cable.
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Post by PinkFloyd on Nov 25, 2014 21:19:19 GMT
I've still go a few of Greg's PCBs in a drawer somewhere...... I'm right into films at the moment Alex, you know me..... always late to the party........ Christ, my reference point (until now) was "one flew over the Cuckoo's nest"....... I have started to watch some modern "Films" and, shit, they are good...... some say that "Blu Ray" is even better than the DVD and it is a whole new learning curve  I'm in the process of making a linear / regulated PSU for my Humax HDR-1000S box...... it will be interesting to "see" if a decent PSU can improve the picture quality...... |
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Post by Deleted on Nov 26, 2014 1:40:22 GMT
Hi Mike I find that work in that area is more beneficial with audio than video, although if you have a very good LED backlit TV or a decent projector, the improvement in colour saturation in particular can be obvious with higher resolution videos . What has surprised me is how good 2160P (4K) video can often look, even on a decent 1080P PC monitor. I would love to be able to afford a decent real 2160P capable monitor and TV.
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