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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 9th May 2013, 01:19 AM   #5931
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Quote:
Originally Posted by pchw View Post
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.
Right said Fred.
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Old 9th May 2013, 07:31 AM   #5932
Kazuo Ozawa is offline Kazuo Ozawa  Japan
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Quote:
Originally Posted by Salas View Post
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.
OK, however would you give me a time of a few days? because my business is busy
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Old 9th May 2013, 08:44 AM   #5933
canvas is offline canvas  Taiwan
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Kazuo san,

I'm glad you've improved the reflektor. I am planning to try the new version. However, I don't have STP55NF06L at hand. Can I still use MTP3055VL as M3?
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Old 9th May 2013, 02:16 PM   #5934
Kazuo Ozawa is offline Kazuo Ozawa  Japan
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Quote:
Originally Posted by canvas View Post
Kazuo san,

I'm glad you've improved the reflektor. I am planning to try the new version. However, I don't have STP55NF06L at hand. Can I still use MTP3055VL as M3?
Thank you for having you be interested in this circuit
Simulation says MTP3055VL is not good, because the output impedance does not go lower sufficiently. However spice model is not real world. It may be worthy to try.
But I recommend STP55NF06L at present.

BTW some advice.
Improved Reflektor is going on experimentation, having both merits and demerits. I will plan to change some config.

Cheers
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Old 10th May 2013, 12:06 AM   #5935
canvas is offline canvas  Taiwan
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I see. It's not easy to find STP55NF06L in my country, but I will try.
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Old 10th May 2013, 08:19 AM   #5936
canvas is offline canvas  Taiwan
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Quote:
Originally Posted by schultzsch View Post
Voltage Reference - Shunt Voltage Reference - LM4040A20 - TI.com[/url]
pro/cons with passive stuff?
The noise density from LM4040 is 35uv/rms (10hz-10khz) which is already much higher than some LDO's. For instance, LT1763 has 20uv/rms from 10hz-100khz, and NS LP5900 is even at 6.5uv/rms. I am thinking about using Onsemi or Sipex TL431 as the 2.5V Vref. Those TL431s have very low noise internal Vref (around 50nv/hz @10hz - 40nv/hz @100khz).

Last edited by canvas; 10th May 2013 at 08:29 AM.
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Old 10th May 2013, 03:23 PM   #5937
woodturner-fran is offline woodturner-fran  Ireland
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So that would be the one shown here?


Any change since then?

Fran
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Old 10th May 2013, 04:38 PM   #5938
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
You will need a 4th LED on top left so to have some margin for easier R1 values since the Vgs is going to be higher in the current region you aim at. You gonna need a 6th LED in the middle for 12V. You use red 1.9V Vf LEDS. You may skip R4 & R5. On the positive one change the connection of Q6's gate for going to ground instead of D pin. Going to D is a Mez DCB1 specific trick only. For circa 4.3A CCS you gonna need 0.56R R1 (ballpark). That resistor is gonna dissipate ~10W(!) so use a sinkable one. Maybe a Caddock.
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Old 10th May 2013, 09:23 PM   #5939
dimkasta is offline dimkasta  Greece
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Niko I have added a 47uF cap at the output of the BiB right on the Shigaclone PCB entrance and noise has dropped to about 10mV

Finally, an affordable CD Transport: the Shigaclone story-salassss-jpg

But hitting auto gives me this...

The simplistic Salas low voltage shunt regulator-saasoscc-jpg

It is not detectable with shigaclone off
Can you please advise? Do I have to worry about this?
C103 is FR at 47uF, R107 is 0R47 and cap at the power entry point is FR 47uF

Thanks again
Attached Images
File Type: jpg saasoscc.jpg (70.4 KB, 684 views)
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Last edited by dimkasta; 10th May 2013 at 09:26 PM.
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Old 10th May 2013, 10:21 PM   #5940
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
So now we know when Shiga is off you get no detection. So its Shiga related. When you hit auto, does the BW limit of the scope remain engaged or it opens up?
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