Ramble FX - Marvel Drive 1.0 [traced]
The Ramble FX Marvel Drive is a nice sounding Plexi Pedal with parallel blending inputs, like a real amp.
It sounds amazing !!, i have one here (V1.0) borrowed and make a schematic.
That´s the first time i analyze a pedal and make a schematic.
So consider me, and check the schematic, if there are any errors in it.
If someone can make a verolayout, that would be great
download this schematic
It sounds amazing !!, i have one here (V1.0) borrowed and make a schematic.
That´s the first time i analyze a pedal and make a schematic.
So consider me, and check the schematic, if there are any errors in it.
If someone can make a verolayout, that would be great
download this schematic
yes, please someone make a vero !
- coldcraft
- Diode Debunker
the pin connections on the FETs are incorrect. compare to another JFET overdrive to see what i mean. could you post a higher resolution image?
Black Dynamite wrote:you need to shut the fuck up when grown folks is talkin.
click on "download this schematic" under that image for a high resolution.
what u mean with incorrect pin connection ?
ah shit, did i mistake gate and source ?
what u mean with incorrect pin connection ?
ah shit, did i mistake gate and source ?
- mirosol
- Resistor Ronker
Yup. Gates and sources are in reverse.
+m
+m
http://tagboardeffects.blogspot.com/
http://mirosol.kapsi.fi/
"No such thing as innocence" -Iron Chic
http://mirosol.kapsi.fi/
"No such thing as innocence" -Iron Chic
Yes, u are right.
Fixed it, and the one 1M at Q4 Drain was wrong too
Actually schematic:
https://dl.dropboxusercontent.com/u/357 ... otter3.png
Fixed it, and the one 1M at Q4 Drain was wrong too
Actually schematic:
https://dl.dropboxusercontent.com/u/357 ... otter3.png
Some Pics:
There is a Wima 4700p cap in, on the pcb it says 470pf...
Under that 180pf Micas, the board says 220pf
---
There is a Wima 4700p cap in, on the pcb it says 470pf...
Under that 180pf Micas, the board says 220pf
---
Ah sry again.
The 470pf is right, my false...
Wima is a 470pf/100 cap
The 470pf is right, my false...
Wima is a 470pf/100 cap
Damn, isn't here a edit funktion ?
Anyway, the resistor below the Styroflex is for the LED (+)
Anyway, the resistor below the Styroflex is for the LED (+)
Looks good
It's basically the input triode stages of a 1987x Marshall (in JFET form) into a mini-booster, into another JFET stage. That's one of the very first Marvel Drives. The ones built now have relay bypass switching, a presence control, and several tweaks. They're much cleaner builds too
It's basically the input triode stages of a 1987x Marshall (in JFET form) into a mini-booster, into another JFET stage. That's one of the very first Marvel Drives. The ones built now have relay bypass switching, a presence control, and several tweaks. They're much cleaner builds too
Thank you RambleFX for verify my amateur work
- IvIark
- Tube Twister
Information
Q4 still doesn't look right to me:
Code: Select all
Q3 drain > Q4 emitter > 100n > 100K > Q5 gate
V
1u > Q4 gate
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
Hmm, i checked the circuit a hundred times i think.
it must be right like on the schematic ? :
Actually Version V3
Pics from Q3 and Q4:
----
....
it must be right like on the schematic ? :
Actually Version V3
Pics from Q3 and Q4:
----
....
- jubal81
- Breadboard Brother
I redrew for clarity. Looks pretty reasonable. The only thing I see as weird are the parallel 220uF & 100uF caps on the source of the 'normal' j201 input.
Here's a link to the full image
Here's a link to the full image
- IvIark
- Tube Twister
Information
Aaah muamp! I couldn't see the wood for the trees
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
- IvIark
- Tube Twister
Information
The 1987X has 330u from source to ground in that position.jubal81 wrote:I redrew for clarity. Looks pretty reasonable. The only thing I see as weird are the parallel 220uF & 100uF caps on the source of the 'normal' j201 input.
"If anyone is a 'genius' for putting jacks in such a pedal in the only spot where they could physically fit, then I assume I too am a genius for correctly inserting my legs into my pants this morning." - candletears7 - TGP
Nice work jubal81.
Looks clearer and cleaner than my experiment
i see, the treble/normal pots are backwards on my drawing
C10 is a polarized 1uF 50 Volt + to Gate Q4
C6 is a polarized 0,68uf 100 Volt
if this is necessary ?
Looks clearer and cleaner than my experiment
i see, the treble/normal pots are backwards on my drawing
C10 is a polarized 1uF 50 Volt + to Gate Q4
C6 is a polarized 0,68uf 100 Volt
if this is necessary ?