Catalinbread - Naga Viper [traced]

[Aeroblus]

Thanks for the advice. When I'm using a battery the noise goes away, but it's the only circuit that has noise with a DC adapter.
Do you have any idea?
I made two more circuits, a Blues Breaker and a RIFT EL34 from the same website and they work perfectly with the DC adapter.

It's hard to tell when you are not providing any info what kind of a "dc adapter" you are using. Is it regulated, what king of regulation? Is it SMPS? Is it simple dc wall adapter, or for pedal use? You could have make a photo of it, provide detailed info and make it easier for the guys to be more helpful.

OH sorry abaut that, I am using a DC adapter Switching 9V 2000mA

[karul]

Is that power supply made for pedal use or it is "universal"? Pedals need regulated and quiet power supplies. Some circuits are more susceptible to noise from power supplies than others. Sometimes you can go by with pretty noisy power supply, most of the times - not. Even with some SMPS designed to be used with pedals, problems with noise can occur.

[Aeroblus]

Hello! I made other pedals and realized that the only circuits I have noise problems with are the circuits that have the 2N2222 transistor. I've been working on three more pedals with the 2n2222, and they all have noise with the DC power supply. I should buy another DC power supply... but I don't know what I have to look for to buy the right one..