The simplistic Salas low voltage shunt regulator

[Salas]

Any suggestion where I should start troubleshooting?

Small transistors first.

 

[Tham]

Will do that. Thanks

 

[iko]

Salas/Iko, one of my 24v v1.5 shunt powering a dac failed last night ...both Mosfets are cold. Vin is 36v and Vout is 33v.

Any suggestion where I should start troubleshooting?

What salas said is most likely.

Can you measure the voltage at a few points and post it? Refer to the schematic that you used.

 

[Melon Head]

motor run cap (big cap, too much inductance).
.

I didn't think polypropylene film capacitors had a lot of inductance.

 

[nicoch58]

Thanh I hope ,as I want use , but big size= induttance.....

 

[quanghao]

The Salas low shunt is very wonderful. I use for DAC , It is ver good!
you can see in board
! thank Salas!

 

[quanghao]

And finis

 

[iko]

Looks nice!

 

[quanghao]

Looks nice!

I gift to you one board, You can sent for mee your Adress, and information!
thank!

 

[Melon Head]

OK I am definitely interested in those boards.
How about a group buy

 

[massimo]

Quanghao, how can you produce professional looking pcbs quicker than we can even think about?
Do you work in a pcb factory? Can we send you some drawings and have them produced as samples?
It goes without saying we pay for them and cover shipping costs

 

[quanghao]

Quanghao, how can you produce professional looking pcbs quicker than we can even think about?
Do you work in a pcb factory?
No! Im design, I'm just a diy, I do Board for me and for my friend use.

Can we send you some drawings and have them produced as samples?
Ok! I can help you!

if you sent me you file, I think, It is standard after a week production is completed.
You can sent for me by e-mail: mythuat818 @ gmail . com Or
quanghao168 @ yahoo . com . vn
Thank

 

[iko]

I gift to you one board, You can sent for mee your Adress, and information!
thank!

You're very generous, thank you, but I have no need for a board in this configuration.

 

[RCruz]

The Salas low shunt is very wonderful. I use for DAC , It is ver good!
you can see in board
! thank Salas!

Nice board !

Would you please post a schematic that goes with the board so we can all follow your work ?

Ricardo

 

[Salas]

http://www.diyaudio.com/forums/powe...-voltage-shunt-regulator-122.html#post1941964

He uses it for digital. 3 on one board. +/- +

 

[RCruz]

Thank you Salas !

 

[RCruz]

It is the same design i am using right now.

I am wondering if I should lower R1 to 9r5 as to get 250 mA current instead of 200mA in my riaa ?

Ricardo

 

[Salas]

If you got the sinking, the stronger you run it tends to become lower output impedance. If you have applied the force/sense wires already it may be even an audible bit in your low PSRR SE phono application.

 

[RCruz]

Salas

Instead of searching for (unobtainablum) parts like 9,4 or 9,5 2w resistors, I was wondering if I could change the leds.

Can I use low current leds like : ROHM|SLR-342YC3F|LED, 3.1MM, YELLOW | Farnell Portugal

Does the current spec matter ?

Can I determine Vdrop from the led spec ?

Regards

Ricardo

 

[keantoken]

Salas

Instead of searching for (unobtainablum) parts like 9,4 or 9,5 2w resistors, I was wondering if I could change the leds.

Can I use low current leds like : ROHM|SLR-342YC3F|LED, 3.1MM, YELLOW | Farnell Portugal

Does the current spec matter ?

Can I determine Vdrop from the led spec ?

Regards

Ricardo

I think the model numbers in the schematic are there simply because those are the only models available... There is no need for exotic LEDs.

Here are some models. I don't know how good they are.

.MODEL LED_RED D (IS=93.2P RS=42M N=3.73 BV=4 IBV=10U CJO=2.97P VJ=.75 M=.333 TT=4.32U type=LED)
.MODEL LED D (IS=93.1P RS=42M N=4.61 BV=4 IBV=10U CJO=2.97P VJ=.75 M=.333 TT=4.32U type=LED)
.MODEL LED_Blue D (IS=93.1P RS=42M N=7.47 BV=5 IBV=30U CJO=2.97P VJ=.75 M=.333 TT=4.32U type=LED)

- keantoken