Salas SSLV1.3 UltraBiB shunt regulator

[beardman]

mosfet is checket for isolation ok

right type of mosfet on M1 and M2 ok

when i mount 0 to 0 volt the voltage slowly goes down led goes out

still ok regulation without any connection

 

[beardman]

some measure

over R1 0.59 volt on pos and neg board R1 2 ohm

from 0 to 0 i measure 18v

have tried all places to see if i can measure some volt from heatsink to component on

pos and neg board no volt to measure

 

[Salas]

Do you use two isolated transformers/secondaries?

 

[beardman]

no only one 18vac

will try 2

 

[Salas]

You have two bridges you need two secondaries...

 

[beardman]

just use 2 18vac

problem solved

thanks so much Salas

now it is time to try it in the real world

Best bjarne

 

[Salas]

Congratulations. Let us know how you will like it. By the way, the current limiter sections saved your PSU from burning by this mistake.

 

[beardman]

a really good idea this limiter....

normally i always use vario trafo....helps also but not in this situation

 

[Salas]

With this one you don't need dim bulb tester because it has "dim LED tester"

In pure scientific terms, mathematically speaking, when its LEDs go out you know you screwed up

 

[dewdrop]

Lights went out for me countless times with no serious damage.

 

[Salas]

Lights went out for me countless times with no serious damage.

Nobody is perfect, no lights is you did something wrong but the limiter kicked in to save the day.

 

[beardman]

Have now tried the reg on my dac

but the neg will not start op pos will

have make a test with a 33ohm resistor the neg reg can deliver about 490ma R1 1 ohm

can it have something to do with the 5.5vdc supply,,, it share 0vdc with the 15vdc

i must try to figure how my dac is connectet

the supply i use now is a supply where 5.5vdc and +- 15vdc is on same board

 

[shattered_dream]

How big should the heat sinks be? Current I use will be 450mA, toroid has rating of 18V im using 15V...

 

[Salas]

Have now tried the reg on my dac

but the neg will not start op pos will

have make a test with a 33ohm resistor the neg reg can deliver about 490ma R1 1 ohm

can it have something to do with the 5.5vdc supply,,, it share 0vdc with the 15vdc

i must try to figure how my dac is connectet

the supply i use now is a supply where 5.5vdc and +- 15vdc is on same board

The current consumption of the various loads must be covered by the settings, all AC secondaries must be isolated, all Mosfets must be isolated.

Check for no voltage difference between any 0V points at the reg outputs.

 

[Salas]

How big should the heat sinks be? Current I use will be 450mA, toroid has rating of 18V im using 15V...

M1 should be dissipating about 3.3W in your case, M2 depends on how much power it shares with the load. If its another 3W it burns then 6W total, a 3C/W spec shared sink for M1 & M2 should be enough.

 

[ofswitched]

One pos. will be used to provide 5V for TB's Buffalo-IIIsePro38. One pos. and one one pos. will be used to provide 15V for TB's MERCURY. Can anyone tell me about the purchase of R1 or other components that need to be purchased, or other special considerations?

 

[Marra]

I have started the assembly of a B1 Korg Nutube buffer pre-amp by Nelson Pass which will be powered by an Ultrabib.






My transformer is giving 21.78V on it's secondaries; is this sufficient for 24vdc output of the Ultrabib or would I better off using one with a higher voltage voltage secondary?

 

[Salas]

This is not a high power application so the CCS setting should be moderate and not enough loss in ripple voltage on C1 will be created. Thus the now transformer should suffice.

 

[Marra]

Thank you Nick. I will hopefully be listening within a couple of days just need to sort a case.

 

[Salas]

Also use thicker & shorter output cables if you can.