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Post by videoguy on Nov 20, 2014 5:30:09 GMT
I must give credit where credit is due. The power supply layout was provided by Will Woodvine & the JLH Ripple Eater by Greg Erskine.
I have simply married the two together on one board. All that is required is to have a 20-0-20 vac, at least 400 ma. rating. By mounting the power transformer in a separate metal enclosure & feed the 20 volt bi polar to the amplifier chassis using 3 conductor 18 ga. rubber covered electrical wire; this allows using a less expensive standard transformer as opposed to the more expensive toroid. This arrangement eliminates any ac current radiating from the transformer inside the amplifier chassis.
It will take me awhile to provide a print showing the component side of the board. For now here is the PCB layout for those desiring to etch their own PCB's. I will be able to provide boards for those not able or wanting to etch their own.
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Post by freddypipsqueek on Nov 20, 2014 20:32:50 GMT
There are quite a view who will know how to populate and wire up this board. I do not - I understand it (I think) but I don't feel comfortable. It would be a wonderful learning curve to do a group buy and walk (talk) through soldering one up. I appreciate this may seem like basic stuff but I'm afraid that's where I am. I've still 20 years till retirement but I'm keen to build some knowledge (and a few boards like this) before I have some real free time !!.
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Post by Deleted on Nov 20, 2014 20:59:49 GMT
There are quite a view who will know how to populate and wire up this board. I do not - I understand it (I think) but I don't feel comfortable. It would be a wonderful learning curve to do a group buy and walk (talk) through soldering one up. I appreciate this may seem like basic stuff but I'm afraid that's where I am. I've still 20 years till retirement but I'm keen to build some knowledge (and a few boards like this) before I have some real free time !!. Adrian Bill will be posting further documentation if there is enough interest. It will also be capable of being used with power supply requirements as low as + and -5V (even +3.3V) to over + and -20V for dual rail preamplifiers and headphone amplifiers. A single component change from a 10K resistor to a J506 Current Regulating Diode in the JLH area of the PCB will improve performance at +3.3V and 5V.
Incidentally, one of Greg's JLH PCBs can be used in conjunction with +5V onboard voltage regulators to provide 2 squeaky clean +5V supplies from the PC/Server's internal +12V SMPS for powering 2 recent lower current SSDs such as the Samsung EVO 840 . The PCB can also be cut in half (carefully) to provide 1 or 2 smaller single output versions. Several C.A. Forum members have reported a SQ improvement with audio stored on internal SSD by providing it with cleaner isolated +5V power. The actual 1s and 0's remain unchanged though. (grin) rockgrotto.proboards.com/thread/9926/another-use-greg-erskines-pcbs
Alex
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Post by videoguy on Nov 21, 2014 0:47:34 GMT
Hi Freddy: One of the realities of retirement is that you will find that you are so busy w Drs. visits & unexpected issues that pop up & need immediate attention; that you would not have time to work a full time job if you had to. My Wife & I are 76 & 77 respectively & have been retired for 5 years. She is having heart issues at present & has been referred to the teaching hospital at University of Florida at Gainesville; it is a 1 1/2 hr drive each way, this amounts to an entire days trip each visit. Then there is lawn care; cutting, edging, weed trimming & pulling, etc., etc. You will find that you are busier than when you were working a full time job. Please do not think I am complaining about our circumstances, just pointing out how busy things can become.
Bill
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jc
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Post by jc on Nov 21, 2014 12:23:45 GMT
This is a great idea and one that has been asked for in the past by quite a few peeps. I like the huge earth plane running through the board and it's ideal for loads of projects requiring a decent PSU especially with the regulators slung on the outer edges of the board making heat sinking options easy.
I'm guessing from the layout that the tank caps spacing allows up 25mm diameter, would a little nudge downstream of the board for chunkier beasties be warranted? Otherwise, is the space between said caps and the rest of the psu area required or could it be shaved down? ( can't remember what a built one looks like for space, hence the questions )
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Post by Deleted on Nov 21, 2014 20:45:45 GMT
This is a great idea and one that has been asked for in the past by quite a few peeps. I like the huge earth plane running through the board and it's ideal for loads of projects requiring a decent PSU especially with the regulators slung on the outer edges of the board making heat sinking options easy. I'm guessing from the layout that the tank caps spacing allows up 25mm diameter, would a little nudge downstream of the board for chunkier beasties be warranted? Otherwise, is the space between said caps and the rest of the psu area required or could it be shaved down? ( can't remember what a built one looks like for space, hence the questions ) Hi Chris If we ever go to a newer JLH PCB design with Greg, I will be suggesting improved spacing for the main electros. Electros such as the higher quality 4,700uF 16V Panasonic FC and Elnas can be squeezed into Will's single JLH PCB design, but can't be used in Greg's version. It's also an advantage to have the voltage regulators on the sides of the PCB to permit improved heatsinking when used in the +5V USB Linear PSU with a JLH add-on, if you wish to use this +5V supply in conjunction with a USB powered DVD writer for ripping CDs. I tried this yesterday with an external Samsung USB powered writer that has a short power cable with 2 USB plugs due to the current limit of .5A from a single USB port being inadequate . It worked fine in a brief test just using the main USB plug and the +5V JLH PSU with no errors when using EAC for ripping the RB CD layer from the "Norah Jones-Come away with me" hybrid SACD. Although the ripped .wav files were only saved to HDD, they sounded quite good, and would likely have sounded even better if saved to an internal SSD powered by a small +12V to 5V regulator PCB using a JLH. Kind Regards Alex
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Post by Deleted on Nov 21, 2014 22:51:57 GMT
Hi Chris
The attached photo shows the point you were making. There isn't really enough room for the higher quality Panasonic FCs etc. on this regulator PCB at present.
Alex
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Post by videoguy on Nov 22, 2014 6:37:22 GMT
Hi Guys: While there are no new holes for larger caps on the regulated supply section; I will be using higher capacity panny FC's on my 1st. build.
I have also filled in the bare areas on the power supply portion so there will be a large ground plane. Is a large ground plane needed? No; it is just to save etchant & cut down on the time it takes to tech the board. Will not be able to produce the first bosrd until the week of Dec. 7th. Will post the results then.
Bill
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Post by jc on Nov 22, 2014 23:16:06 GMT
Alex, yep that certainly clarifies things, nice and tight already. We'll see if Bill manages to squeeze some FCs in  Bill, all looks good as is. Without a radical redesign I don't think anything more can be done? Chris |
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Will
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Post by Will on Nov 23, 2014 10:23:57 GMT
Hi Folks, long time no post!
A quicky - the PSU pcb that that Bill is using is not the same as the one that Alex is showing. The one Alex is showing can take upto 5700uF/25v Panny FC's, if I remember correctly.
It has been a while since I did the layout though!
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Post by Deleted on Nov 23, 2014 11:00:47 GMT
Hi Folks, long time no post! A quicky - the PSU pcb that that Bill is using is not the same as the one that Alex is showing. The one Alex is showing can take upto 5700uF/25v Panny FC's, if I remember correctly. It has been a while since I did the layout though! Yes, Will is correct. They have a different number of AC input terminals. I am not sure that the one I showed in my photo can take the squat Panasonic FC though, as there doesn't appear to be much space to spare (at least, judging by the photo) with the much slimmer Suntans shown in the photo. For longevity reasons, the PSU used with the Class A HA/preamp should use 2,200uF 35V rated electrolytics when using + and - 20V supply rails as a lightly loaded 18-0-18 toroidal transformer will see >25V across the main filter caps. I use Panasonic FC 2,200uF 35 V in mine. Alex
P.S. I don't like it that this forum now appears to be using a form of ad choices that was rejected by members of C.A. forum recently ! They have highlighted the word Panasonic which when clicked on, in my case, leads to Panasonic products in ebay.
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Post by jc on Nov 23, 2014 13:04:17 GMT
Yeah, that was bothering me too. The AC input being different and the rectifier diodes layout is different too. Maybe an earlier version?
As for space for the "FCs" could you utilise "block" heatsinks as apposed to "winged" ones to free up some elbow room?
p.s. Hi Will!
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jonclancy
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Post by jonclancy on Nov 23, 2014 21:20:30 GMT
Long time no post, too. Just keeping an eye on you lot!
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Post by Deleted on Nov 23, 2014 21:29:58 GMT
Long time no post, too. Just keeping an eye on you lot! Let's hope you both post more often again . You guys are sorely missed here. Kind Regards Alex
P.S. Let's hope that Bill can reignite more interest in our joint effort Class A HA/preamp'. You may find my reply in the HFC thread of interest. The Class A preamp/HA as built by RG members is capable of even better performance than perhaps we may realise ?
It’s limitations appear to be more room, Power Amplifier and speaker related . The tap on the shoulder and big grin from the host who is a highly respected Medical Specialist, and Opthalmology surgeon,really made my day.
By the end of the session , Jheena Lodwick would have felt pretty sore though. (“Do that to me one more time”) Devil
Kind Regards
Alex
forum.hificritic.com/yaf_postst3898_experiences-with-power-supply-induced--sound-quality-loss.aspx#post24839
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Post by Deleted on Nov 24, 2014 0:22:18 GMT
CORRECTION. Will's Dual Regulator PCB as obtained from Will via a Group Buy, and shown in my photo, does indeed accept both Panasonic FC 4,700uF 16V and Panasonic 2,200uF 35V as recommended for the Class A HA/Preamplifier project. I am unable to locate a copy of the one that Bill is using in my folder of Will's PCBs , so I presume that it may be an earlier version ?
Alex
P.S. The one featured by Bill is from around August 2009. The one in my photo is a more recent version from December 2012. The December 2012 PCB is also a dual layer PCB. If it was slightly modified to also accept Surface Mount Diodes in the bridge rectifier area, it would be a PCB that I would like to have a few more of !
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Post by PinkFloyd on Nov 24, 2014 10:36:45 GMT
I don't like it that this forum now appears to be using a form of ad choices that was rejected by members of C.A. forum recently. They have highlighted the word Panasonic which when clicked on, in my case, leads to Panasonic products in ebay. I've had a look under the bonnet Alex and seem to have got rid of that annoying ad gremlin. Good to see you guys posting again  |
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Post by Deleted on Nov 24, 2014 10:49:02 GMT
I don't like it that this forum now appears to be using a form of ad choices that was rejected by members of C.A. forum recently. They have highlighted the word Panasonic which when clicked on, in my case, leads to Panasonic products in ebay. I've had a look under the bonnet Alex and seem to have got rid of that annoying ad gremlin. Good to see you guys posting again Hi Mike Good to see that you were able to get around it. The other problem with them is that often link to something completely irrelevant.
Regards Alex
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Post by jc on Dec 28, 2014 11:34:34 GMT
Bill,
A last minute thought. If the board was made splittable in such a way that the resultant split could be stacked (psu atop JLH) it would be even more flexible. Extra features to include an easy split, connections for conducting bars betwwen boards and placement of mounting holes to line up.
Maybe too much of a PITA but desireable!
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Post by videoguy on Jan 8, 2015 22:26:22 GMT
Hi All: I finally got the first composite board made. Have a picture of it that I am forwarding to Pink Floyd for posting here. please forgive the loss of one side of the ripple eater (The light at the shop was bad & I could not see the edge of the board clearly while in the shear). I will solder a piece of buss wire when I populate the board. Will not be able to finish the build til I get more funds shortly. I have drilled the holes for the 3300u 35v caps so they will fit. Bill W.  |
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