Ramble FX - Marvel Drive 1.0  [traced]

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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby IvIark » 10 Jul 2014, 16:49

I think this covers it

[updated below]
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby Frank_NH » 10 Jul 2014, 17:08

Excellent IvIark! I think I have all the parts for this - may have to build this one soon! Thanks everyone... :applause:
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby RambleFX » 10 Jul 2014, 18:36

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.
Here's a link to the full image

[ Image ]


Much easier to read, but a couple mistakes. There is a 180pf cap to ground at the gate of Q2, and the 22n coupling cap after the 'normal' JFET should be before the 'normal' pot.

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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby IvIark » 10 Jul 2014, 19:02

Yes someone just pointed out the 22n, this corrects it and shaves off a column.

[aarrgghh]
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby PedalBlotter » 10 Jul 2014, 19:05

HA :D

Mine is not easy to read, but it´s correctly :horsey:
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby jubal81 » 10 Jul 2014, 19:38

IvIark wrote:Yes someone just pointed out the 22n, this corrects it and shaves off a column.


I've got this thing working. One other thing: The Source of Q4 needs to be grounded - meaning another cut to separate the drain of q5 & source of q4.
It's a pretty good sounding effect.

Image

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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby IvIark » 10 Jul 2014, 20:09

Sassinfrassinrassin!! Cheers for the heads up

Image
"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

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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]  [traced]

Postby jubal81 » 10 Jul 2014, 20:13

Here the corrected schematic.

Cheers to Mr. Ramble for piping in. :applause:

Great job on this. I love the plexidrive and this really gives it a run.
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby jalmonsalmon » 10 Jul 2014, 23:37

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.


So as I see in IvIark's layout, there is only one 330uF cap on that j201's input and those other 2 electrolytic caps are not necessary? :hmmm:
Saves 2 rows of vero so that's cool :thumbsup

Thanks all for the schemo and layout! Cannot wait to make this one.
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby IvIark » 11 Jul 2014, 01:07

The original had a 220u and 100u in parallel giving you 320u. I've just opted for a single 330u cap instead to save space as it is in keeping with the 1987X input stage. All the other caps are there.
"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
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby mmolteratx » 11 Jul 2014, 01:59

FWIW, you could substitute it with a cap as small as 10µ and have the exact same operation in the audio range, which extends pretty far below the guitar range. 330µ is crazy. Just means full gain extends down to .6Hz. 10µ means it goes down to 19.4Hz.

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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby FuzzMonkey » 11 Jul 2014, 04:10

Many thanks for the schematic.
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby johnk » 14 Jul 2014, 11:56

I built one using IvIark's vero and it sounds great. thanks guys for posting the schematic and the layout!


Image

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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby bucksears » 28 Oct 2014, 18:54

Bumping this one:
How imperative is the 220uF cap on the 9V supply? Can I get by with 100uF?

I've got a 35V 220uF cap, but that thing is pretty big to fit between two trimpots.
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby IvIark » 28 Oct 2014, 19:16

bucksears wrote:How imperative is the 220uF cap on the 9V supply? Can I get by with 100uF?


Yes no problem using 100u
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby ppluis0 » 29 Oct 2014, 00:54

Hi there,

The J201 fet's can be replaced -say- with MPF102 adjusting adequately the trimpots at their drains ??

Cheers,
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby bucksears » 29 Oct 2014, 13:05

Thinking about whipping up a PCB based on the schematic for this one.

It's my first vero build (always used PCBs prior) and it WORKS (technically), but the sound is VERY thick/Big-Muff like. I've got it running on 9V and the trimmers at 4.5V on the drain of the JFETs (J201s). Seems like too much compression going on - too woofy, loose in the low-end. Not at all like I heard in Brett's demo.

I'll go through it again, but there are no solder bridges and the part values are correct.
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby bucksears » 30 Oct 2014, 03:22

Ok, made some headway.
I replaced the J201s with 2N5457s, which is my preference (most of the time) in my BSIAB II.

This made it a GOOD distortion/OD (better than it was), but there was still something missing. I pulled the last .0022uF cap (just before the master pot) and that made a LOT of difference. It brought in a lot more presence that was missing before; I could dial up the treble pot to a little over halfway and the normal pot to about half. There is now much more 'kerrang' going on, but a bit too much treble.
That cap position MIGHT be better with either a .001uF or 560pF, if anything.

The other thing is there is still too much loose low-end in the normal channel. Turning the gain up on that is still too fuzzy, not tight.
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby Caferacernoc » 15 Nov 2014, 00:09

"The other thing is there is still too much loose low-end in the normal channel. Turning the gain up on that is still too fuzzy, not tight."

That is what a real SLP sounds like. A lot of those guys back in the day ran middle and treble dimed with the bass nearly off unless they were going for the "woman tone".
As for Brett's video he clearly likes a tighter high gain sound so he probably set the Laney amp's clean channel he plugged into accordingly.
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Re: Ramble FX Marvel Drive 1.0 [Schematic Inside]

Postby bobo » 14 Dec 2014, 10:42

How to add presence pot same as version 2
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