Pulster fixe(s) and rework

Helge Hafting helge.hafting at hist.no
Thu Mar 5 12:56:06 CET 2009

David Reyes Samblas Martinez wrote:
> any sop on the bass fix?
Not yet, jsut descriptions of workarounds.

Two small capacitors needs to be replaced with much bigger ones.
Unfortunately, they are in a shielded enclosure where there apparently 
isn't room for sufficiently big capacitors.

One aproach then, is to put the big caps outside the shield, and use 
wires to connect them inside. But that might lead buzz into the shielded 
unit - not recommended.

Another approach is to short-circuit those small capacitors, and put big 
capacitors on the headset wire instead. But that means only that one 
headset fits your freerunner.

I have suggested a refinement on the second approach: short the small 
capacitors. Add big caps outside the shielded unit - there are places 
with room. But don't put wires from the caps into the shielded
unit. Connect them to the headset plug instead, and break the plug's 
normal connection to the circuit board. This approach won't pick up any 
more buzz than the headset based solution, or the current bassless 
setup. And you can use any headset you want.

The big question is - is it safe to short those small capacitors? Or 
will that have other side effects, such as draining the battery or 
disturbing sound on the built-in speaker?

Another question - is a single big capacitor enough, if it is put into 
the ground line  instead of having one cap for each of the stereo 
channels? Or will that wreck stereo sound? One could then use a even 
bigger cap.

There is lots of easily accessible room next to the battery, above the 
SIM card.

Helge Hafting

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