blues breaker hum

[benfox]

Hi
I've finally manage to built marshall blues breaker
It works well but there is an humnot too strong but anoying.
My stuff is not in box yet i've try to change the input cap but nothing change. I have already looked everywhere on the net but nothing could help me.
BUT THIS PEDAL is really good !!!
benfox

[petemoore]

Hi
I've finally manage to built marshall blues breaker
It works well but there is an humnot too strong but anoying.
My stuff is not in box yet i've try to change the input cap but nothing change. I have already looked everywhere on the net but nothing could help me.
BUT THIS PEDAL is really good !!!
benfox

try a battery
 try it in the box

[walters]

1.) was that a parking lot answer petemoore

[walters]

1.) your power supply is not filtering out the HUM its your
            wall unit power supply most of them made for pedal
            are really cheap get a better power supply and cut
            of the Rails inside the unit and slap the good one in
             there if you want to make this a right. If not just use
             a battery.

[R.G.]

1.) your power supply is not filtering out the HUM its your
wall unit power supply most of them made for pedal
are really cheap get a better power supply and cut
of the Rails inside the unit and slap the good one in
there if you want to make this a right. If not just use
a battery.

Before blaming a power supply, you need to get it inside a box. Being unshielded is the most likely source for the hum. If that is indeed the cause, a battery will not help.

[petemoore]

1.) was that a parking lot answer petemoore

Well, that's what I'd do, anyway, for starters, in the realm of eliminating hum. Hopefully that does it. I'd go as far as to say it's what I'd do before trying anything else except maybe swapping the OA.
 My Exp is that it could be many many things, the battery thing is pretty easy, the box part has to be done sometime, at least before you'll know if putting it in a box will help.
 After all it's just black lines on white on your page, and in this case I see no need to worry about the ones you don't see.

[benfox]

I'd do before trying anything else except maybe swapping the OA.
 .

Thanx but what does that mean OA.
I use a battery guy no panic on this point i'm a beginner but not an idiot !
I think the metal box will do it but not so shure i'll let u know
Merci beaucoup. Means thank a lot in french (too much english over here !!!)
benfox

[mrsage]

OA means the Op Amp chip (also called the Operational Amplifier or the IC/Integrated Circuit chip).

[benfox]

i think that's it
The op amp is a TL 072 CN and it should be a TL072 CP

But what does that mean those letters added to the part number is it the same as for the transistor (gain or something)
 

[benfox]

As i say in my previous message the hum is i think due to the op amp.
Futhermore my pedal doesn't have a lot of sustain.
The sound dies quickly and it's ok for rythm parts but not for solo's and that's why i build this one
Why is there always something bad in this pedal !!!!!
benfox