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The simplistic Salas low voltage shunt regulator
The simplistic Salas low voltage shunt regulator
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Old 19th February 2018, 10:49 PM   #7741
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Quote:
Originally Posted by dwjames View Post
Hi all, it seems I have broken my reflektor d mini . I got a 24v load into the wrong end of my DAC so it will have touched the output of the reflektor d and now the LEDs on the output of both of my reflektor d mini are not lit any more. Presumably I have blown a component, but can anyone guess as to which one is likely to be faulty or how to test them?
Thanks,
James
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Originally Posted by Salas View Post
Check vgs and vbe on mosfets and bjts, rds for jfets. Few V for mosfets, sub V for bjts, few decades of ohm for jfets. Its probably the output mosfet or the jfet near it that has been compromised, but not necessarily so.
Quote:
Originally Posted by dwjames View Post
Thanks for the help. Turns out when I pulled things apart for diagnosis, the reflektor regulators are just fine when not connected to the DAC, so that is good news. Both channels of my DAC chips are fried though, not so good news...
Thanks again,
James
Sorry to hear that about your DAC chips. These regulators utilize the CCS as a current limit guard also and sometimes manage to escape the drama.
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Old 24th February 2018, 06:24 AM   #7742
rhythmsandy is offline rhythmsandy
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Have anyone measured the output noise in Vrms of the bib? what is the measured output noise?
I see the nv/SqHz I agree its bandwidth based calculation but did anyone measured it on the Vrms wise? Do you see a short noise band on CRO with 1mv per division setting?( As I have a CRO which can go till 1mv/div at best ).
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Old 28th February 2018, 03:39 PM   #7743
rhythmsandy is offline rhythmsandy
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Quote:
Originally Posted by rhythmsandy View Post
Have anyone measured the output noise in Vrms of the bib? what is the measured output noise?
I see the nv/SqHz I agree its bandwidth based calculation but did anyone measured it on the Vrms wise? Do you see a short noise band on CRO with 1mv per division setting?( As I have a CRO which can go till 1mv/div at best ).
Can anyone reply on the noise measurement please?
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Old 28th February 2018, 03:59 PM   #7744
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
See posts #4146 4147 in SSLV1.1 builds & fairy tales
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Old 23rd April 2018, 05:40 PM   #7745
iambeo is offline iambeo
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Default Salas V1.2R info

Hello everybody and thanks to Salas for his magnificent work.
I'm going to build the Salas V1.2R PSU and I would like to know some info:
Is the led rated for 1.8V @ 20ma?
How much is the Idss for the 2SK170 and 2N5457?
Thanks in advance for any help.

Bruno
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Old 23rd April 2018, 09:36 PM   #7746
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
About the LED yes. A generic red one will do.

6-8mA IDSS K170 will do. Around 3mA 5457 will do.
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Old 24th April 2018, 08:01 AM   #7747
iambeo is offline iambeo
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Thank you Salas.
Is it possible to use any fet with 6-8ma and 3ma Idss?
Is there a way to check for oscillations in the circuit? I would Like to test the SSLV1.1 I built without any results (the behavior is erratic).
Thanks again
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Old 8th May 2018, 07:13 PM   #7748
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Exclamation UltraBiB

Salas SSLV1.3 UltraBiB shunt regulator
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Old 10th May 2018, 12:49 PM   #7749
Salas is offline Salas  Greece
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The simplistic Salas low voltage shunt regulator
Quote:
Originally Posted by iambeo View Post
Thank you Salas.
Is it possible to use any fet with 6-8ma and 3ma Idss?
Is there a way to check for oscillations in the circuit? I would Like to test the SSLV1.1 I built without any results (the behavior is erratic).
Thanks again
No their Vgs (off) range and noise characteristics are designed in.

To check for oscillations use a scope and probe the rail output. Choose AC input mode on the scope 5mV vertical and 50uS horizontal. Also use the short ground probe's tip coil like wire attachment.

The 1.1 is so widely and successfully used that's odd to be erratic. There's either a problem in the build or the application is not Kelvin 4Wire compatible. Convert it to 2Wire. See this link about it: SSLV1.1 builds & fairy tales
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Old 23rd May 2018, 10:05 PM   #7750
sianturi is offline sianturi  Indonesia
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Default Bipolar Salas V1.2R + Keantoken Multiplier and some measurements

I made a version of V1.2R for +30Vdc and -30Vdc, coupled with Keantoken's Multiplier (K-Multiplier) for powering Aleph (X)Ono phono (clone) stage. Here's the circuit (only +30V shown):

Salas_Keantoken.jpg

And the PCB:

IMG_8484.JPG

Here's the populated PCB:

IMG_8493.JPG

The input of this regulator is fed with +40Vdc & -40Vdc, coming from a C-R-C full-bridge rectifier.

I measured the peak-to-peak ripple at the input of this shunt regulator (+40V only):

SDS1202X-E8.png

And at the load (+30V only):

SDS1202X-E12.png

Measurement at the load was performed with the aligator clip (for ground) and the probe tip (for +), since I'm using the 4 wire Kelvin connection (the + and GND terminal is separated a bit long, about 4 cm), so I think I picked up some additional noise there.

Measurement at the input was performed with the oscilloscope's ground spring.

Comments and suggestions are welcome.
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