Post subject: Filtering noise in IR headphones Posted: Thu
Jan 12, 2006 1:08 pm
Hello all, a tricky question:
of using batteries, I want to power a couple of IR headphones with an
external source, so they are always on.
Then, when I connect
a couple of wires where the batteries were, I get a lot of noise...
I'ver tried filtering (47uF in parallel with 100nF), ferrite, shielding
power cable ...
The problem appears when connecting the wires to
the battery poles, even if there are the normal batteries there and
these wires are connected to no place (open circuit)
this cables act as an antenna for noise, but how can I solve it??
Post subject: Posted: Wed
Mar 08, 2006 10:40 pm
Joined: Wed Mar 08,
2006 8:18 am
i assume when u use the battery the signal
is clean but the external source, noise appears.
1. check if is
it really a cable that act as an antenna. how? examine the short and
long wire if the noise increases in longer wire then the cable is one
that adds the noise.
2. what kind of external source? regulated/linear
type of power supply, if possible dont use switching.
- hope you know what value and where to put those caps.
4. does your
ir led has enough bias?