philipbraunstein
New Head-Fier
- Joined
- Mar 4, 2009
- Posts
- 14
- Likes
- 1
Hello everyone.
I started some months ago a thread asking where to buy parts for my pimeta, now i replaced the AD8065AR and AD8066AR by two OPA2107 and the all BUF634U by LMH6321.
Link to old thread:
http://www.head-fi.org/forums/f6/whe...uf634u-416907/
I asked help of a friend to sold this chips to me, but later i realized that he forget to cut the pins 1 and 5 of all LMH6321. I'm getting some annoying problems as you can see below, the problems are only because the pins 1 and 5 are in contact with the board ?
Problems:
When i turn on the pimeta with a powersupply not regulated of 12v and 1000mA i got humming and others noise.
When i turn on the pimeta using a powersupply regulated and with filters of 12v and 800ma i still get some noise but no hum.
Recorded Noise
When i turn it on the volume its getting distorced, and the pimeta not seens able to drive my sennheiser hd600 anymore.
I recorded the output of my pimeta using low volume and later on high volume for illustrate.
Low Volume
High Volume
Final questions:
Cut all pins 1 and 5 of the buffers will solve the problem of distorcion and noise of pimeta ?
The power supply that i'm using (12v 800mA regulated) is enought for my pimeta and my sennheiser hd600 ?
Pictures of my pimeta:
before the new parts
after the new parts
That's all.
I hope someone can help me with this.
Thanks in advance for everyone that is reading it.
I started some months ago a thread asking where to buy parts for my pimeta, now i replaced the AD8065AR and AD8066AR by two OPA2107 and the all BUF634U by LMH6321.
Link to old thread:
http://www.head-fi.org/forums/f6/whe...uf634u-416907/
I asked help of a friend to sold this chips to me, but later i realized that he forget to cut the pins 1 and 5 of all LMH6321. I'm getting some annoying problems as you can see below, the problems are only because the pins 1 and 5 are in contact with the board ?
Problems:
When i turn on the pimeta with a powersupply not regulated of 12v and 1000mA i got humming and others noise.
When i turn on the pimeta using a powersupply regulated and with filters of 12v and 800ma i still get some noise but no hum.
Recorded Noise
When i turn it on the volume its getting distorced, and the pimeta not seens able to drive my sennheiser hd600 anymore.
I recorded the output of my pimeta using low volume and later on high volume for illustrate.
Low Volume
High Volume
Final questions:
Cut all pins 1 and 5 of the buffers will solve the problem of distorcion and noise of pimeta ?
The power supply that i'm using (12v 800mA regulated) is enought for my pimeta and my sennheiser hd600 ?
Pictures of my pimeta:
before the new parts
after the new parts
That's all.
I hope someone can help me with this.
Thanks in advance for everyone that is reading it.