The simplistic Salas low voltage shunt regulator - Page 566 - diyAudio
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Old 8th January 2013, 10:39 PM   #5651
orelli is offline orelli  Italy
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I tried On Semi MUR860 without caps vs IRF HEXFRED 8A with caps, and the 860 works alot better; less grainy in the treble and less distorsion in the rest of frequencies. I've to compare the 860 with vs without caps. Asap the answer.
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Old 9th January 2013, 12:11 AM   #5652
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The MSR-860 from On Semi are different again - you may like them better, and no snubbers (or filter caps) required.

Hullo Salas, I'm Back!

Just getting parts together for 4 BIB regs for an upgraded 1541A dac + IanCanada's Fifo buffer + Patrick's CEN O/P stage.
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Old 9th January 2013, 01:39 AM   #5653
Salas is online now Salas  Greece
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So you are not just back, but back in black board regs. Good luck.
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Old 9th January 2013, 01:39 AM   #5654
Salas is online now Salas  Greece
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Quote:
Originally Posted by orelli View Post
I tried On Semi MUR860 without caps vs IRF HEXFRED 8A with caps, and the 860 works alot better; less grainy in the treble and less distorsion in the rest of frequencies. I've to compare the 860 with vs without caps. Asap the answer.
Interesting, let us know your verdict.
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Old 10th January 2013, 06:32 AM   #5655
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Default Square wave measurements ...

Hello again Salas,

& thanks for the image of the square wave load response ... I guess the 1.0's response is the bottom curve, right? And from the slope of the square wave it looks as if it's about a 50 kHz wave frequency ...

The response looks quite stable ... do you know which load (current) difference the square wave created relative to the constant current?

Greetings,

Jesper
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Old 10th January 2013, 06:40 AM   #5656
Salas is online now Salas  Greece
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The bottom line is the reg's output rail. It was in an old post from an American member, I just had kept the photo. It was a significant current step VS the reg setting, but I can't recall specifics.
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Old 11th January 2013, 11:05 AM   #5657
roender is offline roender  Romania
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I don't know if the flowing issue is covered or not in this long thread.
I have build an 18V BiB positive regulator and I discovered on the hard way, by fraying the reference voltage bias jfet, that in the case of a short circuit at the output of the regulator and medium to high reference capacitor (over 1000uF) we need a protection Schottky diode placed in paralel with jfet.
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Old 11th January 2013, 11:18 AM   #5658
Salas is online now Salas  Greece
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I have wrote in older times that a high value cap can kickback to the Jfet, normally not when under 470uF with Toshibas. I recommend 220uF in the 1.1 build guide for that so to avoid extra junctions in the ref. A J201 can fry at 100uf even in case of fault. Not only in short condition but on quick on/off cycling also.
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Old 11th January 2013, 11:24 AM   #5659
roender is offline roender  Romania
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Quote:
Originally Posted by Salas View Post
I have wrote in older times that a high value cap can kickback to the Jfet, normally not when under 470uF with Toshibas. I recommend 220uF in the 1.1 build guide for that so to avoid extra junctions in the ref. A J201 can fry at 100uf even in case of fault. Not only in short condition but on quick on/off cycling also.
Do you see any problem if the jfet is reverse bypassed by a diode?
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Old 11th January 2013, 11:43 AM   #5660
Salas is online now Salas  Greece
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Not really with such a big cap swamping it, if you mean connected like in the attached clip.
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File Type: png Snap 2013-01-11 at 14.42.45.png (5.8 KB, 409 views)
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