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MiuAudio MRB Audiophile DIY HeadAmp KIt - Page 4

post #46 of 71
Quote:
Originally Posted by Tilpo View Post


Well, that could be anything.
I'll be blunt and say: is the battery fine?
Also, did you put in the battery clips the right way?
Otherwise you can measure current. Put the battery only on one of the clips, and connect the other polarity to one probe of the multimeter, and the other side to the other battery clip. If you don't understand what I'm saying, then I'll make a diagram.

The battery instantly gets the blue on light and works (badly if course) with my last one. I put the battery clips in the right way, same as last time.

 

Everything is soldered nicely into position so i am quite unsure why.

 

The only difference from last time was swapping R17 and R18.

post #47 of 71
Quote:
Originally Posted by Swimsonny View Post

The battery instantly gets the blue on light and works (badly if course) with my last one. I put the battery clips in the right way, same as last time.

Everything is soldered nicely into position so i am quite unsure why.

The only difference from last time was swapping R17 and R18.

Well, try measuring current like I described. That could tell us a lot of information already.

That is, if you have a multimeter with a ammeter function.
post #48 of 71
Quote:
Originally Posted by Tilpo View Post


Well, try measuring current like I described. That could tell us a lot of information already.
That is, if you have a multimeter with a ammeter function.

I would if i had the equipment but i do not :(

 

I just dont get why it is not working!

post #49 of 71
Quote:
Originally Posted by Swimsonny View Post

I would if i had the equipment but i do not frown.gif

I just dont get why it is not working!

Well, from my experience with the Beta22 (which I haven't finished after 10 months!), I know that sometimes it can be broken in the most inexplicable ways.

Not turning on could be practically ANYTHING.



I'm no expert either, and I doubt any expert will suddenly come into this thread to help you either.
I suggest you'd start a thread in the DIY audio forums. Add a detailed picture of both the top and underside, maybe there's a clue in that.

I'll ask for the people of Miu audio if I'm allowed to publicly post the schematics. (I received them because I needed them to find the swapped resistor problem) That could help others help you as well.
Edited by Tilpo - 8/28/12 at 10:12am
post #50 of 71
Quote:
Originally Posted by Swimsonny View Post

I would if i had the equipment but i do not :(

 

I just dont get why it is not working!


check the polarity of the 4 electrolytics and the 2 diodes

post #51 of 71
Quote:
Originally Posted by geetarman49 View Post


check the polarity of the 4 electrolytics and the 2 diodes

All perfect.

 

BUT... i think i have found the problem. The slightest bit of solder is touching from to compements.

post #52 of 71
Quote:
Originally Posted by Swimsonny View Post

All perfect.

BUT... i think i have found the problem. The slightest bit of solder is touching from to compements.

A short?

That could be it. But it depends on the component. If removing excess solder on that does not work, could you tell me what component it was?
That way we can rule out if it could have caused the symptoms or not.
post #53 of 71

Thanks for the help guys!

 

All sorted now. When i checked the diodes i checked the wrong one. Switched the diode around and now i have power. Sound is correct so i have one fully working!

post #54 of 71
Quote:
Originally Posted by Swimsonny View Post

Thanks for the help guys!

All sorted now. When i checked the diodes i checked the wrong one. Switched the diode around and now i have power. Sound is correct so i have one fully working!

beerchug.gif


If you have any sound impressions, please tell me. I'll put them in my review.

I personally couldn't distinguish from another amp, so I was incapable of review the sound of this device. However, I can include other's impressions to make up for my incapability in part.
post #55 of 71
Nah your review was good and I will be making my own review so that's were my sound impressions will go.
post #56 of 71

My Unboxing and Making of Video:

 

 

If you enjoy please subscribe as well!

post #57 of 71

I'll have more impressions on the MRB after I get an attenuator for my IEM's 

post #58 of 71
Quote:
Originally Posted by bowei006 View Post

I'll have more impressions on the MRB after I get an attenuator for my IEM's 
One of those adapter cables that increase the impedance?
post #59 of 71
Quote:
Originally Posted by Tilpo View Post


One of those adapter cables that increase the impedance?

Yeah and new cables. It is impossible to use the MRB with an iPod Touch with L9 LOD with stock TF10 cables as the L shape connector is big enough for the L9 to not connect into audio in on the MRB :(

 

I'll find some work around.

 

The only devices so far with no hiss are my dedicated amps and DAC's, my iPod directly out and E5. 

post #60 of 71
Quote:
Originally Posted by bowei006 View Post

Yeah and new cables. It is impossible to use the MRB with an iPod Touch with L9 LOD with stock TF10 cables as the L shape connector is big enough for the L9 to not connect into audio in on the MRB frown.gif

I'll find some work around.

The only devices so far with no hiss are my dedicated amps and DAC's, my iPod directly out and E5. 

Why would you want one of those with the MRB in any case?

The MRB already has a pretty high output impedance. In addition to that you can make it pretty much any value you want by changing the value of R5 and R14.
The standard value of R14/R5 is 30 ohm, which corresponds to an output impedance of... 30 ohms.
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