The simplistic Salas low voltage shunt regulator - Page 571 - diyAudio
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Old 6th February 2013, 06:53 PM   #5701
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well thx for the moment, looks like I have a little bit to read tonight cause I was away from this thread for awhile
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Old 10th February 2013, 10:17 PM   #5702
RollE2k is online now RollE2k  Sweden
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Don't need a SMD pcb anymore, i made a (really) compact design board 4mm wider than original pcb and two regulators per PCB, including psu common mode choke. Although i have removed sensing output, maybe i keep it like this or use smaller output connectors.
This will be perfect for my low current (100-120mA) demands.

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Thanks alot (once again) Salas for a great design.
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Old 11th February 2013, 12:18 AM   #5703
canvas is offline canvas  Taiwan
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The 1.2R could be very compact. Here is my result.

Click the image to open in full size.


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As you can see, the heat sinks occupy many of the space. I chose larger ones to sustain up to 600ma current draw in total (12vin/5vout). At 600ma, the heat sinks are "very" hot, but it's been running for weeks without problem. BTW, the red WIMAs are 4.7uf MKS2.

Last edited by canvas; 11th February 2013 at 12:30 AM.
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Old 11th February 2013, 02:49 AM   #5704
Salas is online now Salas  Greece
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Hey Canvas, beautiful close up pics. You have rectification & filtering there also, yes? Did you check it on the scope for stability?
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Old 11th February 2013, 05:22 AM   #5705
canvas is offline canvas  Taiwan
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Hi Salas,

Yes, it includes 4 HFA08TB60 and filter caps. The output cap is OSCON 47uf/16v, and it's stable under my scope. By the way, the zobel network is very important. At first, I put an OSCON 4.7uf there, but after I replaced it with 4.7uf WIMA MKS2, the sound has dramatic improvement. With limited space, it seems the WIMA MKS2 (MKS4 maybe?) is my only choice.
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Old 11th February 2013, 05:29 AM   #5706
Salas is online now Salas  Greece
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Yes, its a sensitive area subjectively. That is why it got the film and the polar cap in combination on the original schematic. What you use it for? Oven oscillator, dac?
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Old 11th February 2013, 07:36 AM   #5707
canvas is offline canvas  Taiwan
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I use your regulator on my transporter, OCXO, and digital part of my DAC. I am going to build the negative version so that analog part will be take care of, too. Thanks for the great work, it helps a lot.
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Old 13th February 2013, 08:55 PM   #5708
RollE2k is online now RollE2k  Sweden
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Salas:
Since my SSLV boards above will feed high capactance load (~220uF), i'll need to put a ~1R resistor in series before the load, but i started wondering. Wouldn't this in my case be best to skip the Sense-output, and just put the shunt-load in parallel directly on the board, then maybe series ~0,5R on the output wires. Why i'm asking is because i could use to smaller output terminals (2,54mm spacing) rather than the big 5,08mm ones i like to get sensing. But i would still need to put a series resistor at the load then, right? And this makes me think it would be better put the shunt directly connected on the board...
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Old 13th February 2013, 08:59 PM   #5709
Salas is online now Salas  Greece
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Use a non super low esr cap and put it across the output on the reg without extra resistor first, then see if the whole thing with th powered circuit included has a clean rail on the scope in AC coupling.
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Old 13th February 2013, 09:08 PM   #5710
RollE2k is online now RollE2k  Sweden
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I haven't ordered the PCB's yet, which is why i ask. I'm thinking about skipping the Sense-output due to that maybe won't work with the capacitance, and also in the compact design, i get a little bit "better" layout without the extra pcb-lanes for sensing. So why i asked now is because i wonder which version of the PCB i should order, with or without sensing.

Last edited by RollE2k; 13th February 2013 at 09:26 PM.
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