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
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
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
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
just use 2 18vac
problem solved
thanks so much Salas
now it is time to try it in the real world
Best bjarne
problem solved
thanks so much Salas
now it is time to try it in the real world
Best bjarne
Congratulations. Let us know how you will like it. By the way, the current limiter sections saved your PSU from burning by this mistake.
a really good idea this limiter....
normally i always use vario trafo....helps also but not in this situation
normally i always use vario trafo....helps also but not in this situation
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 😀
In pure scientific terms, mathematically speaking, when its LEDs go out you know you screwed up 😀
Nobody is perfect, no lights is you did something wrong but the limiter kicked in to save the day.
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
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
How big should the heat sinks be? Current I use will be 450mA, toroid has rating of 18V im using 15V...
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.
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.
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?
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?
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?
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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.
Thank you Nick. I will hopefully be listening within a couple of days just need to sort a case.