Super Regulator

[dvd7900]

Tonescout - CRC or CLC is fine after the rectifier for the SR.

 

[tonescout]

Thanks is there any mV ripple advised, and is there a good place to see the right DC Vin for 5V out 🙂

Great!

Rich

 

[jan.didden]

Depends a bit of what you want at the output. Roughly, the output ripple is a few 100,000 times lower than at the input.

Jan

 

[tonescout]

Ok - well I have no figure in mind, I am purchasing it for improved sound quality reasons over an above an ifi SMPS wall wart device.

100,000 is pretty significant!

for 5V what do I need on the DC input, is there a good table or simple model I can find anywhere?

Thanks!

 

[dabochkarev]

Hi. I have made a simulation of super regulator in NI Multisim and got strange result: output voltage is rising from 0 to reference voltage very slow.
Does this schematics have any startup delay in real world?

 

[jan.didden]

Ok - well I have no figure in mind, I am purchasing it for improved sound quality reasons over an above an ifi SMPS wall wart device.

100,000 is pretty significant!

for 5V what do I need on the DC input, is there a good table or simple model I can find anywhere?

Thanks!

You should have a few volt headroom. 8v would be a good number to aim for but it isn't critical. 100,000 uF is insane and will cause other issues. 10k is enough.

 

[tonescout]

Jan,
I was looking at this as I have small start up where there is very temporary 1.3A transients. (100,00 was regarding the ripple rejecton)

Is this a crazy idea?

 

[jan.didden]

Are you worried aboutb the ripple rejection during the transient ??

Jan

 

[tonescout]

Jan,

Thanks for super quick reply 🙂

I have absolutely no experience of regulators and so I want to ensure that the normal steady state is not overloading the regulator and that the start up sequence is not going to fail due to a short voltage drop (even if that is a thing!)

I can keep changing R to make it work on the transient start but I don't want to overload the regulator in normal use if this ends up being too much voltage

Rich

 

[tonescout]

This is the start up current demand, so not crazy. Always assuming a cheap eBay meter is accurate!!

 

[jan.didden]

What are you measuring here?
And if you say: start up current, my next question will be, of what and where?

Jan

 

[tonescout]

Thanks for the reply again 😀

I am using an Allo USBridge as an end point running Roipeee and current demand is as the system boots up on switch on to load the software from a micro sd card

The device receives music via internet protocols with the music files coming from a MacBook playing audirvana

 

[tonescout]

I placed the meter in line on the power into the USBridge which is 5vDC

🤓

 

[jan.didden]

But what does the superreg feed? I have trouble to understand what feeds what. Do you have a block diagram?

Jan

 

[tonescout]

i hope this terrible drawing helps!!

Super Reg just feeds the USBridge, which is 5V DC, and you have seen the current draw on the video

Thanks for all the support

Rich

 

[jan.didden]

I think it should not be an issue, if the steady state is indeed 500mA.
What is the pass device on the superreg, and at what current is the current source set?

Do not trust the mechanical moving iron meter with no info on the ballistics.
It is normally too slow to indicate a peak, or if the peak is very short it may indicate too much due to mechanical overshoot.
Get a real digital multimeter.
Maybe gift the meter to a friend for his preamp ;-)

Jan

 

[jan.didden]

Forgot to ask: what is the capacitance at the output of the duperreg?

Jan

 

[mhenschel]

is that a "super duper regulator"? ;-)

 

[jan.didden]

Haha - good catch. Fixed.

Jan

 

[tonescout]

Forgot to ask: what is the capacitance at the output of the duperreg?

Jan

I had assumed I would just run the super reg into the USBridge, do I need a local capacitor here?