hembergler
1000+ Head-Fier
- Joined
- Nov 19, 2005
- Posts
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- 13
First off, I apologize for yet another CMoy-problem topic. I used the search function and wasn't able to find a solution to my problem.
Since I thought I had set up the amplifier circuit, I decided to test it before I put it in a case. I hooked up everything by having a Mini->Mini cable coming from my CD Player's Line-Out. Then, I used alligator clips to connect the proper parts of the amplifier to the tip/ring/ground of the Mini->Mini cable. Then, I took three more alligator clips and connected the Tip/Ring/Ground of a pair of KSC75's (great cheap headphones, by the way) to the outputs/ground on the amplifier. I put the headphones on, and voila! Distortion beyond belief. It was terrible, you could barely make out what song was being played.
I then tried disconnecting one channel, to see if either side was worse than the other. With only one channel working, the sound cleared up a lot, to the point where you could tell what song was being played. In general, most of the distortion was gone. But, there was absolutely no bass whatsoever. It was completely gone. The other thing, is if you touch any of the resistors, you can hear a definite buzz in the headphones. I'm guessing there's a grounding problem, that I don't know how to fix.
I've been attempting to follow Tangent's instructions thus far, so the configuration for all the resistors is the same as what's on his website. Probably worth noting, I'm using an OPA2132 op-amp.
Here are some photos of the amp so far...
Top View(s)
Bottom View(s)
Since I thought I had set up the amplifier circuit, I decided to test it before I put it in a case. I hooked up everything by having a Mini->Mini cable coming from my CD Player's Line-Out. Then, I used alligator clips to connect the proper parts of the amplifier to the tip/ring/ground of the Mini->Mini cable. Then, I took three more alligator clips and connected the Tip/Ring/Ground of a pair of KSC75's (great cheap headphones, by the way) to the outputs/ground on the amplifier. I put the headphones on, and voila! Distortion beyond belief. It was terrible, you could barely make out what song was being played.
I then tried disconnecting one channel, to see if either side was worse than the other. With only one channel working, the sound cleared up a lot, to the point where you could tell what song was being played. In general, most of the distortion was gone. But, there was absolutely no bass whatsoever. It was completely gone. The other thing, is if you touch any of the resistors, you can hear a definite buzz in the headphones. I'm guessing there's a grounding problem, that I don't know how to fix.
I've been attempting to follow Tangent's instructions thus far, so the configuration for all the resistors is the same as what's on his website. Probably worth noting, I'm using an OPA2132 op-amp.
Here are some photos of the amp so far...
Top View(s)
Bottom View(s)