I finished my first pedal project ( a Mudbunny) and it sounds great other than a hiss that is audible even at fairly low volume. any ideas why this background noise is there?
Hum is more common in Big Muffs ...
How loud is the hiss in comparison to the guitar? Do you get a ton of fuzz along with it? (Like, the pedal sounds right?)
You can also audio probe the circuit to find out where it's being introduced.
But Muffs are noisy. If it's just a little bit of white noise and it's much lower volume than the guitar, then you probably got off light. :)
To add to Jon's comments, Does the white noise happen on battery or an adapter? Is this the only pedal in the chain when testing? I know some compressors and boosts will introduce noise on BMPs.
Did you use 2N5088's You could also start with replacing Q1 and work on down the line and see if it changes. Could be a doggy transistor.