which regulator did you use?
7805 has quite high losses...

cheers,
 Bruno

  Bruno L. Albrecht
  Eng. da Computa=E7=E3o/06
  Falker Automa=E7=E3o Agr=EDcola Ltda.
  http://www.falker.com.br



Drew Pilcher escreveu:
> I figured out the problem with my PIR setup.
>
> Based on Jesse's suggestion I added a second switched 5v reg to power the=
 PIR circuit, this cut out the noise more or less completely. Out of curios=
ity I set my multimeter between the two reg's 5v pins, low and behold the d=
ifference was fluctuating almost 50mv which I hadn't noticed with my meter =
in the 200v range. At this point it became pretty obvious that the original=
 7805 was at least part of the problem so I switched everything over to the=
 more modern regualtor, still almost no noise. Even removing all the filter=
s and decoupling caps accept those accross the IC power pins and refrences =
didn't bring the noise back, so I'm confident the problem was just my crapp=
y 7805 all along. **facepalm**
>
>
> Thanks to everyone for the advice, you guys are great.
> Drew,
>
> _________________________________________________________________
> Hotmail=AE has ever-growing storage! Don=92t worry about storage limits.
> http://windowslive.com/Tutorial/Hotmail/Storage?ocid=3DTXT_TAGLM_WL_HM_Tu=
torial_Storage_062009
>   =

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