Author Topic: radio frequencies from a BYOC phase 90?  (Read 1223 times)

nag hammadi

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radio frequencies from a BYOC phase 90?
« on: May 25, 2006, 08:31:51 PM »
hey guys.  anyone build a BYOC phase 90 and get RF issues?  i have built several of them for friends and they have all been great.  but one guy practices near a radio station, and gets REDICULOUS RF.  none of his othere pedals do it (including ones i have made for him).  i use hammond boxes.  i looked inside his and the battery cables were pretty long, as were a few of the hookup wires.  i am also grounding to both the input and output jacks. 

one friend said i should ommit the output jack ground...

none o fmy others have had the problem anywhere BUT in his practice space...  ?


as a side note, marshall amps do the same thing when used in the area.... ?

thought and comments?
in the face of you all i stand defiant - subhumans

darkseid

Re: radio frequencies from a BYOC phase 90?
« Reply #1 on: May 26, 2006, 02:35:23 AM »
I never built it, but I have a few thoughts lol...........

You said a few of the wires are long, so you surely want to shorten them up.
Placing a cap or an RC in the circuit probably will work.

Filters can roll off the frequencies you don't want to amplify, so maybe adding a cap from signal IN to ground may work.
capacitor = 1/(2 * PI * resistor * frequency Hz) = roll-off frequency

Is the station AM? AM usually bleeds over any type electronics that is close by, there is several ways to fix that.

good luck.
« Last Edit: May 26, 2006, 02:37:56 AM by darkseid »

d95err

Re: radio frequencies from a BYOC phase 90?
« Reply #2 on: May 26, 2006, 02:47:11 AM »
Try the usual solutions. 47n to ground at the input and/or a ferrite bead in series with the input.

A.S.P.

Re: radio frequencies from a BYOC phase 90?
« Reply #3 on: May 26, 2006, 04:29:38 AM »
make that 47p ?
Analogue Signal Processing