New Posts  All Forums:Forum Nav:

PIMETA Parts - Page 3

post #31 of 42
7/2/06 at 2:26am
Thread Starter 
Wow, that was a bad mistake, looks like I ordered the wrong chip a long time ago... I meant to order the AD8620. Is the AD820 a single amp? I'll put in another one of my chips and test it again.
Reply
post #32 of 42
7/2/06 at 2:26am
I would suggest that you re-flow a few of those solder joints.. especially your R3's because those are freezing cold.
Reply
post #33 of 42
7/2/06 at 2:26am
Quote:
Originally Posted by Teh0therside
Is the AD820 a single amp?
yup
Reply
post #34 of 42
7/2/06 at 2:31am
Thread Starter 
It doesn't sound all the bad right now, but there is still distortion on the treble parts and an overall unclear sound. I'll try to lower the gain from 11 as I have it now. I'll also go over the bad solder joints again, but my Radioshack iron with a 1 year+ old tip is on its last leg and I need to invest in a better set up.
Reply
post #35 of 42
7/2/06 at 6:50pm
Thread Starter 
Apparrently, it was my headphone(ATH-AD500) plug that was causing all the distortion. I have had problems with it before and have sometimes had to pull the chord a certain way to hear both channels. With the amplifier, I can put the plug in all the way and get no vocals or bass, very little and hear only vocals and bass, or half way and hear some amount of all three. How can I get a new headphone jack that will work with my ATH-AD500s? Finally, the buffer on the lower left got hot enough to make touching it uncomfortable with about 10 minutes of play. The lower right one was slightly cooler, and the upper buffer was only slightly warm. I am using 200ohm R11s with the buffers. Thanks.
Reply
post #36 of 42
7/2/06 at 10:41pm
That plug sounds like a bit of a worry. With what you describe, it sounds like you're possibly short-circuiting the output, drawing a high amount of current through one of the buffers, heating it up. The buffers do have short-circuit protection (iirc) but I'm not sure if they can handle it for a sustained amount of time.

So finding a jack that will work with your headphones is, like you say, a good idea. One idea is to use a 6.5mm jack. Your headphones come with a 6.5mm adapter - might have to go looking for the box - so you could try that.

(I have my own ATH-AD500's and my own PIMETA - in fact listening to 'em now! A gain of 11 is way overkill if that's your combo... mine is closer to 2.)
Reply
post #37 of 42
7/2/06 at 11:47pm
EDIT: Never mind - I forgot R10's aren't needed without Class A.
Reply
post #38 of 42
7/3/06 at 12:11am
Thread Starter 
I don't think that there are any jacks that will work with my headphone plug, as it has had the same problems with my sound card and DVD player jacks. The 6.5mm adaptor may work, but I need to use these headphones with my computer as well as iPod so I would like to have a working 3.5mm plug. How could I replace it with a different plug?
Reply
post #39 of 42
7/3/06 at 2:12am
Cut it off, then solder a new one on. It goes without saying, make sure you know which wire is which, and the use of some heat shrink can make the new plug look nice.
Reply
post #40 of 42
7/3/06 at 5:27pm
Thread Starter 
This is headphone plug that is currently on my ATH-AD500s. As you can see, it is crooked and I cannot bend it back very well so that it works acceptably. What 3.5mm plug would be best for durability and the same general look of the current plug?

Reply
post #41 of 42
7/3/06 at 10:05pm
As for suggestions, you can log on to the various electronics or audio supplier web sites, and browse their lines of plugs. Or you can go to your local Radio Shack or equivalent electronics shop, and buy a generic gold-plated plug. It won't look like the original but it should work as well.

I just checked the plug on my ATH-AD500's - it's slightly different to yours. I'm not sure the differences would be the reason for your problems, though. Best to find another set of headphones, and physically measure the plugs, looking for any differences. Maybe you can "mod" your existing plug, with shims, etc. to make it work. It could just be a case of the plug going too "deep" into the socket, shorting the ground and right channels on the socket. Especially how you describe having to insert the plug "halfway" to get the right result.

If you're going to cut the old plug off, the wires will probably be different colours. You can then use your multimeter to match the colours on the cut end of the plug with its different areas - tip, ring and sleeve. Use the continuity setting. This will help you connect the new plug.
Reply
post #42 of 42
3/9/11 at 10:19pm

hi, sorry for bumping old thread. i'm about to build pimeta v2 as well, and i have a question

 

is changing the resistor in signal path from dale rn55 to some takman or prp resistors going to significantly improve the sound quality? i mean, if it does not worth a try, i wouldn't bother spending extra cash for takman or prp which are almost twice the price of rn55


Edited by i_djoel2000 - 3/9/11 at 10:22pm
Reply
New Posts  All Forums:Forum Nav:
  Return Home