TLDR: Can the Beyerdynamic DT 990 Pro headband assembly be modded to work on a pair of D2000's? Hey all, I recently moved to an apartment so I can't listen to my speaker sett-up as loud as I would like and have revived my forgotten pair of D2000's. Wow, I forgot how good they sound, but the...

Quote:   Wow, it does look nice.  I usually don't pay that much attention to Fiio because they are generally below my price point (all though I respect them as a company for what they have done for the audio industry).  However, in the real world I design outerwear, and I really like the...

Quote:   Thanks for your insight!  I've looked at the Leckerton UHA-6S MKII before.  My only issue with that device was that it only samples up to 16-bit/48khz via USB streaming, and I would also use this as a portable desktop DAC.  The not-yet-available iBaso D Zero-SE looks interesting...

Hi all,   I'm going to be getting a new Android phone soon and I've been looking at getting a portable DAC/amp to pair with it.  My goal is to spend <$500 on a DAC/amp unit that is battery powered and has both a good DAC and amp.  I've been following this thread for some time and the leading...

Thanks for your reply.  I'm familiar with VA ratings.  I thought that they rated the maximum output of a transformer, but I wanted to be sure.  My previous transformer should have been able to handle the power that my circuit needed but it burnt out so I wanted to make sure that it was the...

Hi all,   A while back I built a Morgan Jones tube amplifier for my electronics lab's final project.  It worked beautifully until my transformer burnt out.  I've been looking at transformers and I have a questions about how they are rated for power.   I need a 500V CT transformer with a...

Quote: I've used USB charging boards from ebay to charge rechargeable lithium batteries in other applications.  A 5V battery might be hard to come by though.  I was thinking of using a couple 3.7V batteries with a resistor to bring the voltage down.  If I did this circuit I would probably...

Quote: Interesting, I was under the impression that Sennheiser designs their headphones for 0 output impedance.   In my limited amount of direct comparisons, I have tend to agree that low output impedance improves sound.  

Quote: I'm looking forward to your comparisons!

Hi all,   I've been looking around for a DAC replacement for my Xonar D1 sound card for my PC.  I actually like my D1 and I run it through a Matrix M-Stage amp so the high output impedance isn't an issue. Any ways, I came across the Meridian Explorer and was very impressed by the reviews.  I...

Quote: If you live in Colorado (or might be passing though) and like to downhill Keystone or Winter Park are are the best lift accessed places in CO IMO.  If you are more interested in XC then I might suggest Vail or Breckenridge; however, non-lift accessed  bike trails might be just as...

For anyone that downhills or is interested in riding Keystone.  I dug up this video that my buddy and I made when we lived in Keystone a few years ago ... Wow I had long hair.  

I'm in Colorado at 5,400 feet.  I'm finishing school this in a few days so I should  have tons of time to ride this summer!

The way Chinese bikes work might be considered somewhat unethical.  There are no international patent laws and Chinese manufactures end up producing OEM frames from other companies designs.  This happens all the time from China and other similar countries (especially in the apparel industry)...

I own a few bikes but I just built a new track bike.  Some of the parts I had lying around and the rest I bought from ebay.  I didn't really spend that much building this bike.   OEM Chian Frame. Hed H3 front wheel. Hed 50mm carbon rim with a novatec hub. Shimano Ultegra cranks...

Hi all,   I'm not a huge audiophile all though I do appreciate good sound.  I have even built a dot MK3 amp, however; I tend to not be all that active when it comes to keeping up with the latest and greatest in audio equipment.     *I'm not trying to provide a review for any of the...

Hi all,   I'm not a huge audiophile all though I do appreciate good sound.  I have even built a dot MK3 amp, however; I tend to not be all that active when it comes to keeping up with the latest and greatest in audio equipment.     *I'm not trying to provide a review for any of the...

My friend and I are building the Morgan Jones headphone amplifier for a school project (the one with feedback which can be found here http://gilmore2.chem.northwestern.edu/projects/cmoy5_prj.htm).   The power supply I used is:     When we turn the circuit on we only see about 40V...

Hey guys I'm building the Morgan Jones amp for a school project.  You guys helped me design the power supply before and I am great full, but I was just confused.   Where do the grounds from the input and output go to?  I looked around a little and didnt see any thing.  Does it just go to...

Quote: Thanks, I didn't realize you could add more than one section after the rectifier.  Every thing makes so much sense now.   Thanks to every one who helped I am always impressed by head-fi's community.  

Quote: Thank you so much.  It makes sense to me now.  I totally understand that with electronics theory and actual operation can differ greatly (especially with tubes).  I will read some more about transformers and power supplies.  I'm glad I at least know where I am going now.  I have...

Quote:   I haven't had any experience with transformers or rectifiers (I have been reading and sadly the art of electronics books I have is missing the first chapter (the one with transformers in it)).  I was just hoping some one could walk me through what is going on in the circuit.  It...

  Quote:   I have been using schematic 13, mostly because 250VAC transformers seem to be rather abundant.   Ok so here is what I calculate from a 250VAC transformer at 50mA.     Rectifier: (full wave RMS equation) Sqrt(2)*250 ~ 350 VDC (not 320DC)   Voltage drop across the...

Ok so I need a transformer with a 250 VAC @ 50mA and 6VAC @ 2A secondary coils, and rectifiers that are ~ 2x the peak voltage of the AC signal they will be rectifying.   I was looking at the schematic and I have a few questions.  Is the 250V RMS voltage?  When I calculate the DC voltage from...

  Quote:   Hmmm. Maybe I'm stupid I could have sworn the schematics all said 220VAC @ 50 hz (I guess I was tired) that is why I assumed they were for British outlets .  So the 250VAC is just the secondary coils?   I suppose that makes sense.   I did some research.  Correct me...