Fuzz Face clone "screams" when DC plug inserted

[Coelhomatias]

Hi guys, I'm having a problem with my fuzz face clone, when on the battery it works really well and sounds very good, but as soon i insert the DC plug it makes a screaming noise that's terrible. I used this schematic to make the clone :
https://1.bp.blogspot.com/-Dq3PZC6Hx20/VGJO3swCsaI/AAAAAAAAC-Y/rmDcr6TsS9k/s1600/Fuzz%2BFace.png
and this one to maek the off board wirings :
https://diystrat.blogspot.com/2009/06/how-to-wire-up-stomp-box-effects-pedal.html
I don't know what's going on can you help me please?

[thermionix]

NPN silicon?  What kind of DC adapter?  Can you post pics?

[amptramp]

The Fuzz Face does not have any power supply filtering or even any bypass capacitors.  If you were running off a regulated DC supply, there would probably be no problem, since it works with a battery.  The Fuzz Face is notoriously sensitive to power supply impedance and quality.  Some DC power supplies are switching types that whine or provide low-quality power.

[thermionix]

My only wall wart is a rather noisy 1A Radio Shack SMPS type.  It works fine with some pedals in "stock" configuration, including Rat, Phase 90, CE-2, TS808, others.  It's too noisy to use with my (unmodified) Wah or Dynacomp.  It's quiet with my BMP after I added filtering.  It's still too noisy for my Fuzz Factory with the same added filtering.  Surprisingly, it works great with my Si NPN Fuzz Face, no added filtering.  Go figure.

[Coelhomatias]

Hi guys, thank you for replying! Yes it is a NPN build with the BC108 transistor. I used this DC jack:
https://www.musikding.de/DC-power-jack-21mm-isolated
And this circuit has filtering, i think that's what the 47uF capacitor is doing no?
Also i first used a 100uF one instead of the 47uF but then i replaced it and the problem continued so i don't know.

[thermionix]

You're right the 47uF has been added to the circuit for filtering.  It won't do much by itself though.  Add a small resistor in series to it (maybe 47 ohms or so, between the DC jack and the board) and a small ceramic cap (try 100n) in parallel with the 47uF.