I had a 125B drilled for one knob sitting around, so a while back I started a thread asking everyone's favorite one-knob pedals, or pedals that could be good as one-knob versions with some trimmers inside. I like simplicity :)
I got loads of great suggestions, but the one I went with in the end was Hogharry's suggestion of a Magnavibe with a trimmer for the depth (this is the other one - Thanks TreeSlayer :) ), and the single outside knob being speed. I built it from the Tagboard Effects layout, and it fired up first time! Some pics:
(http://www.mcallisterra.com/photos/magnavibe/magnavibe.jpg)
I always like to try to do things I haven't before, so a couple of firsts for this one:
- First vero build!
- First time using a trimmer for a normally external control
- First time alcohol inks went on and stayed on successfully ;D
The last time I tried the alcohol inks, I used purple, and the mod podge turned it into a nasty burgundy color. I did it again and just used polycrylic, and it just didn't last. This time, since the colors were greens and blues, the mod podge didn't affect the colors negatively. I then finished it with rattle can polyurethane which can also amber colors, but again it's not noticeable.
I need to find a better LDR because the one in there currently doesn't have a high enough dark resistance, so the effect is still quite subtle even with the depth maxed. I socketed the LED and LDR though and it's easy to get to so I'll try some others at a later date.
One last thing - is it ok to ground the pot like that? I didn't want to run another wire round if I could avoid it, so I just soldered a jumper to the pot case. It seems to work fine, but I just wondered if there was a reason you shouldn't do that?
Cool build! I've been thinking about building this one as well. Shouldn't be a problem with grounding the pot that way as long as the pot and jacks stay tight, especially for your own pedal. I probably wouldn't do that for a build that's going to someone else but that may be more out of paranoia than anything else. How do you like vero? Tagboard is a cool site and I've built dozens of their layouts.
cool, I like the ink job. never tried those
Quote from: Luke51411 on April 04, 2015, 07:21:33 PM
Cool build! I've been thinking about building this one as well. Shouldn't be a problem with grounding the pot that way as long as the pot and jacks stay tight, especially for your own pedal. I probably wouldn't do that for a build that's going to someone else but that may be more out of paranoia than anything else. How do you like vero? Tagboard is a cool site and I've built dozens of their layouts.
Thanks! Yea I doubt this one will even get gigged. The singer in my band always complains about any pitch shifting effects ;D
I do prefer PCBs!
I guess vero is ok but I was getting frustrated at one point. Maybe my iron tip is too thick, because I was getting lots of solder bridges. At one point I was thinking it would be a miracle if it worked
Vero is nice because there are so many verified layouts. I preferred it to pcbs for a while because of the extra flexibility for modding but I haven't had as much luck with them lately.
Yea. I'm already thinking of other ones I can do with the remaining vero I have haha.
Nice build!
I have a one knob magnavibe too, love it, great circuit. 8)
Looking great, good work! :)
I really like this circuit from the demos I've heard, sounds awesome. Unfortunatelly I am unable to get any depth from mine. It's barely perceptible when the effect is on. I have tried everything from half a dollar LDRs to vtl5c2 and in between. I expected a lot from a certain Silonex model that raulduke recommended that has a 20M dark res but whatever I tried didn't sound amywhere near the demos. It is so frustrating and slowly heading to my box of fail I'm afraid...
Hmm maybe it's not as simple as just sticking in a new LDR then. Mine is definitely noticeable when it's on, and I was only looking for a subtle warble anyway, but it would be nice to get a bit more out of it.
I measured the LDR in there and it only gets to about 1.2M fully dark. The doc called for 20M so I have to think it would get a bit more pronounced with a different one or a vactrol.
I found the cheap Tayda LDR actually works really well in it.
that enclosure is amazing. Just awesome dude, love it 8)
Looks great!
Quote from: mcallisterra on April 05, 2015, 03:00:41 PM
Hmm maybe it's not as simple as just sticking in a new LDR then. Mine is definitely noticeable when it's on, and I was only looking for a subtle warble anyway, but it would be nice to get a bit more out of it.
I measured the LDR in there and it only gets to about 1.2M fully dark. The doc called for 20M so I have to think it would get a bit more pronounced with a different one or a vactrol.
I used the Tagboard layout and mine sounds pretty good to me. I certainly didn't use anything special, just a cheap eBay LDR and (I think) a standard 5mm red LED with the top bent towards the LDR. I will try to measure the LDR when I get a chance and report back.
Quote from: Hogharry on April 05, 2015, 11:01:22 PM
Looks great!
Quote from: mcallisterra on April 05, 2015, 03:00:41 PM
Hmm maybe it's not as simple as just sticking in a new LDR then. Mine is definitely noticeable when it's on, and I was only looking for a subtle warble anyway, but it would be nice to get a bit more out of it.
I measured the LDR in there and it only gets to about 1.2M fully dark. The doc called for 20M so I have to think it would get a bit more pronounced with a different one or a vactrol.
I used the Tagboard layout and mine sounds pretty good to me. I certainly didn't use anything special, just a cheap eBay LDR and (I think) a standard 5mm red LED with the top bent towards the LDR. I will try to measure the LDR when I get a chance and report back.
Thanks!
Yea I have them pointed at each other as well but I used a yellow diffused 5mm LED. It was just a RadioShack LDR but I picked the one with the highest dark resistance of the lot.