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  1. Niksun

    Making a 0-28VDC@0-3A Power Supply using linear regulators (LM350)

    Audioguru, OK, so if it were up to you, would you go with my double LM317 design with the high watt rheostat to limit the current?  I'm not sure the best way to go about placing a potentiometer there to vary the current limit (due to the potentially large amount of power dissipated by the pot)...
  2. Niksun

    Making a 0-28VDC@0-3A Power Supply using linear regulators (LM350)

    Ack!  Yes, you are correct.  If you draw a horizontal line which starts at the right end of R3 and goes right, that will be the regulated Vout.  PSU Ground can also be extended to the right for the regulated ground. In terms of R3: can you not simply set your voltage, short the output of the...
  3. Niksun

    Making a 0-28VDC@0-3A Power Supply using linear regulators (LM350)

    I keep getting stuck on the current limiting rheostat.  No matter how I do it, it's going to potentially dissipate a lot of power.  I tried placing a 0.833 ohm resistor in series, but that still could mean 0.85W between both if the rheostat is set at 1 ohm.  Sure, a 100W 100 ohm rheostat would...
  4. Niksun

    Making a 0-28VDC@0-3A Power Supply using linear regulators (LM350)

    OK, so here's what I have so far.  I have added an analog voltmeter and ammeter.  I've also updated the notes (primarily for my newbie self) :P I figure I should have the heat managed with properly heatsinked LM317s.  Also, I should have the full 1.5A available so long as I stay within the 15V...
  5. Niksun

    Making a 0-28VDC@0-3A Power Supply using linear regulators (LM350)

    I think I found something that may work.  I couldn't find a data sheet on it though.  It's a 20 ohm wire-wound linear taper potentiometer rated at 2-4W.  The part description: "Nice quality screwdriver adjust full size 20 ohm 2-4Watt potentiometer by Clarostat features 3/8" panel mount bushing...
  6. Niksun

    Making a 0-28VDC@0-3A Power Supply using linear regulators (LM350)

    OK, so if I understand the LM317 (I decided to switch to the LM317) data sheet correctly, so long as the Vin/Vout difference is within 15V, then I should 1) be able to get 1.5A out of the LM317 (so long as I have a Vin/Vout difference of at least 3V or so), and 2) have manageable heat so long as...
  7. Niksun

    Making a 0-28VDC@0-3A Power Supply using linear regulators (LM350)

    Got a question. I am working on a 0-28V, 0-3A power supply using several LM350 linear regulators.  I'm including necessary capacitors to minimize ripple and ringing and implementing short circuit protection via some standard rectifier diodes.  I'm wondering if the following schematic makes...
  8. Niksun

    Convert 0-30V 3A PSU to 5A or more

    Noted.  I am trying out a circuit now to charge them to see if it will even work.  In any event, does anyone have some sort of current schematic for the 0-30V, 0-5A PS?  Thanks.
  9. Niksun

    Convert 0-30V 3A PSU to 5A or more

    Gah!!  I apologize; I made a mistake.  I meant 0-30V and 0-5A.  Wow, the "5" key is awfully close to the "3" key, eh?  :P As an aside, I've been investigating recharging regular, old alkaline batteries (I know, most think this is not a good thing) with this PS.  In any event, I figure that...
  10. Niksun

    Convert 0-30V 3A PSU to 5A or more

    OK, so does anyone have a "latest" schematic for this puppy (the 0-50V, 0-5A)?  Also, some of us are still learning and may need more specifics in terms of what parts to heatsink and what parts to get, so perhaps a list of parts would be nice.  Thanks a bunch and keep up the great work! --Niksun
  11. Niksun

    Convert 0-30V 3A PSU to 5A or more

    Hi, I am a beginner in actually "messing" around with electronic circuits but have been around them for a while and am very comfortable tinkering around.  For example, I've been working with FPGAs for several years, albeit mostly on the software side of things.  I have also made a robot which...
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