Pedalpcb M800

Manuel Ammon

Well-known member
Last pedal built. PedalPCB M800, Marshall JCM 800 type with full EQ section. It's a little bit tricky to dial in the 6 trim pots inside. Did it by ear. Full, raw sounding Marshall sounds. Wanted the look of a JCM 800 did the graphic like that. All pots runs up to 11..... 1660843446816.jpg
 

Attachments

  • 1660843487806.jpg
    1660843487806.jpg
    416.7 KB · Views: 67
ye hast misunderstood, the pedal is 95% built, after i get the last piece or 3 for externals I ask for your guidance setting the inner trim pots ;)
 
ye hast misunderstood, the pedal is 95% built, after i get the last piece or 3 for externals I ask for your guidance setting the inner trim pots ;)
Usually for these kind of circuits you set the trimpots so the bias of the jfet drain is around 4.5V, and then fine tune by ear from there.
 
ye hast misunderstood, the pedal is 95% built, after i get the last piece or 3 for externals I ask for your guidance setting the inner trim pots ;)
Sorry, found a treat in this group, see link below about a PAL800. It's the same circuit. Set all trimmers to 4,5V. Doesn't sound fine to my ears. I dialed in every 6 trim pots by ear. Started at 12.00 O Clock. After 30 minutes dialing in, pedal sounds like a real JCM 800 Marshall.
Hope it helps....
 
Last edited:
How do you get graphics so opaque? Paper/Ink ? I have big transparency problems on mine... they look ok on pale enclosures, but really bad on darker ones. Ran out of clear ...

16614466022133774627985643765894.jpg
 

Attachments

  • 1661449990373.jpg
    1661449990373.jpg
    344.9 KB · Views: 22
  • 1661450015041.jpg
    1661450015041.jpg
    628.1 KB · Views: 23
  • 1661450042981.jpg
    1661450042981.jpg
    332.9 KB · Views: 22
  • 1661450068143.jpg
    1661450068143.jpg
    337.7 KB · Views: 19
  • 1661450093665.jpg
    1661450093665.jpg
    574.2 KB · Views: 19
  • 1661450120674.jpg
    1661450120674.jpg
    661.8 KB · Views: 19
  • 1661450171763.jpg
    1661450171763.jpg
    393.4 KB · Views: 19
  • 1661450197249.jpg
    1661450197249.jpg
    480 KB · Views: 20
  • 1661450219745.jpg
    1661450219745.jpg
    564.2 KB · Views: 21
Thanks! When you say "2 slides on top of each other" you mean avery over mirror, or two prints on top of mirror foil ?

I'm laser printing, it tends to crack and chip.
 
Thanks! When you say "2 slides on top of each other" you mean avery over mirror, or two prints on top of mirror foil ?

I'm laser printing, it tends to crack and chip.
Yes, Avery transparent printed foil over mirrow foil. Works perfectly
 

Attachments

  • 1661450015041.jpg
    1661450015041.jpg
    628.1 KB · Views: 16
  • 1661450042981.jpg
    1661450042981.jpg
    332.9 KB · Views: 13
  • 1661450093665.jpg
    1661450093665.jpg
    574.2 KB · Views: 12
  • 1661450120674.jpg
    1661450120674.jpg
    661.8 KB · Views: 10
  • 1661450143898.jpg
    1661450143898.jpg
    463.8 KB · Views: 10
  • 1661450171763.jpg
    1661450171763.jpg
    393.4 KB · Views: 10
  • 1661450197249.jpg
    1661450197249.jpg
    480 KB · Views: 9
  • 1661450219745.jpg
    1661450219745.jpg
    564.2 KB · Views: 15
Back
Top