Bigfoot FX Magnavibe

KindaFuzzy · Post by **KindaFuzzy** » 17 May 2011, 02:08

Post away dude, then I'll have a rough idea what I'm up against.

The Rotagilla · Post by **The Rotagilla** » 17 May 2011, 23:43

KindaFuzzy wrote:Post away dude, then I'll have a rough idea what I'm up against.

I haven't redrawn it so it's not really mine to post but here's the link.

culturejam · Post by **culturejam** » 18 May 2011, 00:24

^^^

Did you just go fishing for that? If so, nice work!

The Rotagilla · Post by **The Rotagilla** » 18 May 2011, 01:27

culturejam wrote:^^^

Did you just go fishing for that? If so, nice work!

No, I've had the schematic since he posted it back in 2007.

pinkjimiphoton · Post by **pinkjimiphoton** » 18 May 2011, 04:59

just built this thing, sounds great!!!

but i gotta dumb newbe question....

what's the deal with the in4001/47mf cap to the led? is that for the indicator led to flash or something?

i haven't boxed it up yet, figured i better ask, cuz i don't get it!!

does it matter where i take the b+ from? is it necessary, or can i just hook the led up the way i normally would to the 3pdt switch?

thanks in advance!!!

peace!

greenskull · Post by **greenskull** » 18 May 2011, 05:11

Don't know which layout you are working from, but sounds like the diode/cap is for polarity protection/filtering. Yeah, I would hook up the LED as you normally do..... should be good to go!

greenskull · Post by **greenskull** » 18 May 2011, 05:26

ah.... if it's the Eagle files layout, you would just connect the positive leg of the LED to the LED pad and run the negative leg to your foot switch. The resistor marked "RLED" would be 4.7k or whatever you normally use for your LED limiter resistor.
Hope this helps some and not confusing things more.

pinkjimiphoton · Post by **pinkjimiphoton** » 18 May 2011, 12:42

thanks greenskull, i appreciate it. i'm working from the schem in the zip file earlier in the thread, i built the vero layout. but it doesn't show the in4001/47mf part.
here's a snip:

here's the whole schem...can you or someone please tell me where this is supposed to hook up? it says to t, but i don't see a t on the schem other than at ground...

Nocentelli · Post by **Nocentelli** » 18 May 2011, 15:26

The diode is for polarity protection and the big cap is to filter the power. I don't usually bother with polarity protection, and I usually hook a 100u electro directly across the power jack, so I left them off that vero layout. I have since updated the layout to include them, and I'll upload it when I get home tonight.

pinkjimiphoton · Post by **pinkjimiphoton** » 18 May 2011, 15:35

ok, gotcha bro, thanks!
i'll add the cap right across the power jack,

Nocentelli · Post by **Nocentelli** » 18 May 2011, 16:43

Version 3 - Now with on-board polarity diode + filter cap:

: Magnavibe v3_nocentelli.gif (18.48 KiB) Viewed 2264 times

toneman · Post by **toneman** » 18 May 2011, 22:44

effin' phantastic degoop job there

pinkjimiphoton · Post by **pinkjimiphoton** » 20 May 2011, 05:29

real nice job, bro, i am absolutely loving this pedal...it's like a perfect cross between a vibe and tremolo, killer, thanks again!!!

RnFR · Post by **RnFR** » 20 May 2011, 21:29

if rat shack is still open on my way home from work, I'm going to pick up some optos and give this a shot. I would highly suggest a buffer on the input though. I think it will liven things up a bit.

pinkjimiphoton · Post by **pinkjimiphoton** » 20 May 2011, 22:39

rat shack optos will work fine, 5k resistance is plenty for this circuit. use the biggest led ya can find, i used a 10 mm super bright white one and made a vactrol with shrink wrap...works great!! 50 k pots seem to be fine, too, if building a rat shack version.

RnFR · Post by **RnFR** » 20 May 2011, 22:50

I'm not buying pots from the shack, way too expensive- just optos!

pinkjimiphoton · Post by **pinkjimiphoton** » 20 May 2011, 22:56

i hear ya!! lol!

not crazy about the rat shack optos...they seem to be all over the place in terms of quality and resistance.

this is a really, really sweet sounding pedal bro, i think you're gonna really diggit!!

it seems to LOOOOOOOVE humbuckers...haven't tried it with a strat yet.

Nocentelli · Post by **Nocentelli** » 21 May 2011, 05:57

RnFR wrote:I would highly suggest a buffer on the input though. I think it will liven things up a bit.

(In theory) would having a buffered (non-true bypass) pedal in front of it have the same effect?

pinkjimiphoton · Post by **pinkjimiphoton** » 21 May 2011, 15:36

i run it at the end of my fx chain, maybe the buffering would improve it. i usually like vibes before distortion tho, have to try both ways.
can always add a little buffer easy enough.

Krefu · Post by **Krefu** » 22 May 2011, 10:03

I'm breadboarding this tonight with a buffer in front. I'll let you know

Bigfoot FX Magnavibe [traced]