The simplistic Salas low voltage shunt regulator - Page 593 - diyAudio
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Old 7th May 2013, 02:56 PM   #5921
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Default Reflektor Advanced +4.7V

Sorry not +5.0V, but +4.7V.
My WaveIO board is running with this config. and seems to be good.
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Old 8th May 2013, 11:30 PM   #5922
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I'm looking for a supply to give me up to 4A and 12V (even a little more current would be good). After having fantastic results from the salas shunts,both LV and HV, I'm wondering if its possible to squeeze that much current out of it?

Fran
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Old 8th May 2013, 11:33 PM   #5923
Salas is online now Salas  Greece
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What will be the mean average current draw of the load?
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Old 8th May 2013, 11:34 PM   #5924
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3-3.2A @12v
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Old 8th May 2013, 11:37 PM   #5925
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If I remember correctly the IRFs can handle about 12A max. You will need some serious heatsinking though... Both for the CCS resistor and the IRFs.
Salas will have to advise on any BiB specific limitations though...
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Old 8th May 2013, 11:39 PM   #5926
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Ok, I was aware of the heatsink needs, I had earmarked a heatsink about F5 sized....
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Old 8th May 2013, 11:44 PM   #5927
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Quote:
Originally Posted by woodturner-fran View Post
Ok, I was aware of the heatsink needs, I had earmarked a heatsink about F5 sized....
To semi-quote some DCB1 advice, you will need F5 size sinks for ~2A. For 4A or even more to get some headroom, you will have to get into some huge aleph territory... It will depend on some other staff though like voltage drop etc... Excel should be your friend
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Old 8th May 2013, 11:52 PM   #5928
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It will be the DCB1 reg schematic to implement. But with 4 leds in the CCS. That one has been used up to 3A. The dissipation is going to be Vin-Vo times full set current for the CCS Mosfets (very hot) while the dissipation for the output Mosfets is going to be Vo(12V) times (CCS-load current). Setting the CCS should be mean average at load plus peak demand and 200mA spare. Do it on air p2p like a high power valve circuit with thick copper wire connections for the rails and grounds and don't rely only on solder to hold hot stuff. Twist and screw where heat is much. Keep any electrolytic as cool as you can and use only 105C parts.
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Old 8th May 2013, 11:56 PM   #5929
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Quote:
Originally Posted by Kazuo Ozawa View Post
Sorry not +5.0V, but +4.7V.
My WaveIO board is running with this config. and seems to be good.
Can you take a scope picture of its output on dummy load resistor for nominal WaveIO current at 10nS/2mV div and shortest probe ground fixture possible? I want to observe something, thanks.
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Old 9th May 2013, 01:30 AM   #5930
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Thanks, Salas, off to heating up the soldering iron now :-)
It is going to be fun to explore !!
Lookie lookie, my first reflector powered up, and a little adjustment at the pot, it was dead on 5V, so happy Will swap out the Bib with this later for a comparision.
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