Requested by Alltrax74, a phaser based on MXR Phase 90 with some bells and whistles.
Schematic is avaiable HERE
Note that the J FETs should be matched for best effect and CLR 1 value is 47k in the schematic but you could probably go lower if you not using a super bright LED
Hi.Put link in place of 10n (M22-I22).
ReplyDeleteFixed.
DeleteAh ah ! Thanks man you rock :)
ReplyDeleteOk, I went through the layout with the schematic :
ReplyDelete- There should be a cut under either D1 or the link from IC1-4 to ground (to separate 680k from 47n)
- Mix Vibe 1&3 shoould be inverted
- Same for Switch 1&3 (but I guess here that makes no difference)
- Rate CLR is 47k, maybe it's worth mentionning it as a note, as it's not common to have such a high value
- As for the phase 90, I guess the 5457 should be a matched quartet
In any case another very well put layout !
I'll have to order parts and should be able to start building it in a couple weeks :)
Gotcha! Added some info, a cut and swapped the lug connections.
DeleteI built it, so far no phasing.
ReplyDeleteAudio signal passes, clean output. Only the volume pot works at it should. Some light volume variations with the mix-vibe pots, bias and depth do nothing. Rate led barely lights with the 47k CLR, but flashes and flash speed varies with the switch and speed pot.
I use TL082 but that should be ok, I tried with a random set of 5457 and a matched set of 5952 i have in a phase 90. Same result
thanks for giving it a go.
DeleteI'm away from home for a couple of days but will check the layout vs. schemeatic when I get back.
Ok I have some phasing, but still not quite there. After looking again at the schem, the rate CLR is 4k7, not 47k (my bad).
DeleteSo i replaced it accordingly. Still nothing with the 5952 matched quartet. I put back the 5457 and now got some phasing, but only when bias pot is rolled back, depth full CW and mix-vibe somewhere around the middle position. Vol and speed work as they should. I asked the guy from deadastronaut on his YT demo if the 5457 really need to be matched as there is no such info on his build doc. I went over my build a few times and didn't see any error (which of course does not mean there is not)
Here is DA's answer : "You can, but luckily i havent had to do that and ive built a few of these"
DeleteSo, a random set of 5457 should be ok
Hi.I did and works fine,so it'verified. Add to the notes Mix Vibe 50k B.I used matched chinese J201s,with 2N5457 l found the same problems described by Alltrax74.Successful operation depends on Jfet.
ReplyDeleteOk, I got it to work by swapping the 5457 for a random set of SMD J201, thanks for the tip !
DeleteCompared to my phase 90, phase intensity is almost the same, maybe a bit lower. Next step will be to match these J201 (I have a dozen) with a JFet matcher.
Still, I don't get the purpose of that Mix-Vibe pot, effect phases only around it's center position. Do you experience the same ? If not what does this pot do ?
So, I spent some time sorting J201s :)
ReplyDeletehttps://i.goopics.net/eE8DD.jpg
I got 4 sets within 10-15% margin, i put in the Faze Filter a set that mesures 70-76mV
Better result, phases as it should i guess now. Mix-Vibe seems to have more effect but i'm still a bit confused about what this pot controls...
Audio taper doesn't seem right for the speed, rate is very slow until it gets suddenly fast. i might try a lin there.
Thanks to both of you guys :)
Hi Alltrax74. Thanks to you for identifyng the missin cut.In my build the Mix Vibe control works as a blender ,rotated clockwise it emphasizes phasing,counterclockwise it looks like a chorus.
ReplyDeleteHi.1MC is perfect for speed. 1MA and 1MB are not good.
ReplyDeleteHi.I am very satisfied with how it works. The chinese J201 measure 0.30mA-210mV.TL072 obtained from musikding.de. Best regards and good jobs.
ReplyDeleteHello . What software use for layout ? Thanxxx
ReplyDeleteI'm using DIYLC G3 V40.0. There is a newer version to download.
Deletehttps://github.com/bancika/diy-layout-creator/releases
Thanks guys for your build reports. Added a note for regarding the Speed control.
DeleteHi Fuzzhead, although I may buy his board to support his great job, Rob from DA lately released his Astro Flanger Filter, if you feel brave enough...:)
ReplyDeletehttps://deadastronaut.wixsite.com/effects/copy-of-skyscape-chorus
Oh c'mon:-).
DeleteLooks very cool but I can't promise anything. It is definitly on my "to-try" list, though.
You have to have a flanger on your blog, you know it :D
DeleteI built this a while ago and couldn’t get it going. I had a hunch that smallbear gave me four matched 5457s. They were too high gain to use in anything else anyway. They had. Fired up. I’ve never built a phaser before. Lucked out. Didn’t even build a fet matcher to test em. Now if only I could be lucky in the parts of my life that matter. Doh!
ReplyDeleteBuilt this with j201 smd from tayda (unmatched) and it phased right away - very happy how it sounds, I find all the knobs to be very useful. Thanks for the layout!
ReplyDelete