joneeboi
Headphoneus Supremus
- Joined
- Jul 7, 2006
- Posts
- 1,919
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- 20
Here is the situation:
I normally run my PIMETA on a single NiMH 9V which outputs 7.2V. I tried tomb's trickle charger with a 19V supply, but when I plugged in my headphones (Zune buds for testing) I get a loud pop when they plug in and then when I listen there is no bass. When I switch to my KSC75s, there is again no bass to be found. Thinking it was only a problem with the wall plug, I returned to my normal setup of the 9V. Trying to up the ante to dual 9V, I once again found the same thin and non-existent bass.
Any ideas what is going wrong? I have in the board an OPA2132PA, AD823AN, 3 BUF634s, 4 Panasonic FM 220uF rated at 25V, 0.1uF generic box caps at C4, and Alps RK09. What other part values are relevant here? Does this mean I have to implement the PPA bass boost?
I normally run my PIMETA on a single NiMH 9V which outputs 7.2V. I tried tomb's trickle charger with a 19V supply, but when I plugged in my headphones (Zune buds for testing) I get a loud pop when they plug in and then when I listen there is no bass. When I switch to my KSC75s, there is again no bass to be found. Thinking it was only a problem with the wall plug, I returned to my normal setup of the 9V. Trying to up the ante to dual 9V, I once again found the same thin and non-existent bass.
Any ideas what is going wrong? I have in the board an OPA2132PA, AD823AN, 3 BUF634s, 4 Panasonic FM 220uF rated at 25V, 0.1uF generic box caps at C4, and Alps RK09. What other part values are relevant here? Does this mean I have to implement the PPA bass boost?