Power-Supply for Marshall "Dread-Master"

[kusi]

hi volks

im form switzerland, please excuse my terrible english..... :?

im 18 years old  and i`ve a job as electronicer. (training)
in my free-time, i bulit stompboxes.

my next project is de Dread-master.
http://www.diystompboxes.com/pedals/Dread1.GIF
http://www.diystompboxes.com/pedals/Dread2.GIF

but i`ve got a problem: there is no power-sullpy on the schematic.
normaly, Uref is 4,5V. but the DM has other voltages, called C and E. konws anybody this voltages?

have one of you a power-supply for the DM?

i hope you can help me

thanks a lot and greetings form switzerland¨!

kusi

ps: great forum........

[jimmy]

hi there

the power supplies on these stompboxes are more often than not just 9V DC. this can come from a 9V battery or a wall wart. the VRef voltage comes from a voltage divider comprising of 2 resisitors and a capacitor coming from the V+, it should be shown somehwere in the schematic.

good luck
Jim

[Mike Burgundy]

power =9V, c=e=Vref = 1/2V=4.5V
hih

[kusi]

hi mike!

hmm, are you shure? i found this schematic of the shredmaster (father of the DM  :wink: )

http://www.harpamps.com/schematics/shrdmstr.pdf

C and E aren`t voltages, they are use for the bypass-switch!

but why is E pull to ground, when the pedal is off?

thanks a lot!


greetz kusi

[jimmy]

if its for the bypass switch, then its grounded so there is no squealing when bypassed, becuase, by the sounds of it, its a hi gain pedal.

cheers
Jim