Here's an MXR Envelope Filter with a few mods. The Emphasis pot works backwards. CCW is full effect, CW mixes it out. So it's more of a De-emphasis control. The effect is pretty quacky overall. I did have a problem with it not working at first. After a little reading on the web I found that there could be a problem with the Texas Instruments CD4069's not wanting to bias like other brands. I swapped out a resistor in the voltage divider that biases IC2 (referring to the Tonepad MXR EV schematic) and it came to life. So that could maybe fine-tuned a bit more. I'll try to dig up the links for info and all the relevant mods tomorrow.
Board-mounted everything for less wiring. Always a bonus for me.
This is my 3rd build using clear adhesive sticker stock. I'm liking it. A lot less fiddle-f'ing around than waterslides. Plus I didn't need to clear coat after printing. I don't know how well it will stand up in the long term, but being a build for myself it seems like a good time to experiment.
(http://i928.photobucket.com/albums/ad124/v4hor/Pedals/20141020_205850_zpse145fe28.jpg)
(http://i928.photobucket.com/albums/ad124/v4hor/Pedals/20141020_205934_zps871febe6.jpg)
(http://i928.photobucket.com/albums/ad124/v4hor/Pedals/20141020_210027_zpsaeb1f0a5.jpg)
(http://i928.photobucket.com/albums/ad124/v4hor/Pedals/20141020_210051_zpsca9f0912.jpg)
Flapchicks with Duck face!!!!! LMAO!!
Very nice built Mark! :D
Quote from: GrindCustoms on October 21, 2014, 04:52:40 AM
Flapchicks with Duck face!!!!! LMAO!!
Very nice built Mark! :D
I was like, what the hell is Rej talking about?.. then I seen it pop out at me.. LOL
Man your SMD builds make me queazy, my stomach hurts when I stress and I feel like my stomach would hurt a lot during these builds. lol Excellent job and I love your wiring great wire color choice also :]
Cody
That's so awesome my gall bladder won a breakdancing contest just looking at a picture of it.
Killa! :o
Your builds are getting pretty ridicolous in terms of tidyness. You know you make us look like kindergardeners, right?
You and wgc are ripping it up...
Incredibly well done! Gorgeous work on the wiring!! Very clever on the decal. And that SMD work!!
This is absolutely killer, Mark! Quacked me right up.
Is this a solder paste build?
Thx for the nice comment Alan!
Very refined looking build, Mark. There are all sorts of nice touches to it. Looks great.
Did you create the mudflap duck face girl graphic yourself?
There is so much awesome going on with this pedal - inside and out. Put a big smile on my face.
Chuck's builds are so good that each one delights me as much as it makes me feel inadequate. ;D :-X ;D
Love your smd work Chuck! Each one is impressive.
one of the cleanest builds ever. super!
What a quacking build! I keep wondering 'waddle chuck build next?' ;)
Thanks for the kind words, guys. You guys and all your crazy builds and contributions are very inspiring.
Quote from: wgc on October 21, 2014, 12:58:44 PM
This is absolutely killer, Mark! Quacked me right up.
Is this a solder paste build?
That's pretty punny, Billy. :) Yep, another paste build. I keep forgetting to order some different nozzles for my syringe so I'm still having a little bit of a control issue. But I've got it written down on a list of things to order from Mouser. Hopefully I'll find that list by the next time I have to place an order.
Quote from: pickdropper on October 21, 2014, 01:05:21 PM
Very refined looking build, Mark. There are all sorts of nice touches to it. Looks great.
Did you create the mudflap duck face girl graphic yourself?
Thanks Dave. No, I'm totally lacking the skills to do original art. I think I Googled "sexy duck" or something similar. I also used it on my build of Harald Sabro's part Mutron/part Meatball envelope filter.
Spectacular! 8)
I remember the issues when I built this circuit on the Tonepad layout. Had to use Fairchild CD chips to get it to work. The TI chips were unusable. Only when I went into the build reports did I find this out.
Definitely let us know what went into making the TI chips work out...
Your boards are fantastic.
Quote from: Govmnt_Lacky on October 22, 2014, 12:30:44 AM
Spectacular! 8)
I remember the issues when I built this circuit on the Tonepad layout. Had to use Fairchild CD chips to get it to work. The TI chips were unusable. Only when I went into the build reports did I find this out.
Definitely let us know what went into making the TI chips work out...
I actually stumbled upon this while looking up info for a Bad Stone PCB that I'm starting to work on. It was noted that some people were having troubles using TI CD4069's in that circuit and changing the bias might fix it. Then somebody else thought that could be the issue with their MXR EF. Unfortunately, I can't find the thread (pretty sure it was at DIYstompboxes) but I did happen to save this reply. I think it's from Mark Hammer and refers to the MXR EF:
"There is a voltage divider (R14/R16 on the tonepad layout) attached to the IC2 4069. Presumably, it influences the bias. But the derived voltage, connected to IC2, is offset from Vsupply/2 (it is 100k/(62k+100k) x Vsupply, from memory), and this seems to stop some circuits from working. Certainly, my TI-equiped circuit didn't work. Fortunately, changing the 62k resistor to 100k resulted in instant success. I believe that others have had similar success. So the TI chip might have a tighter spec or be more sensitive to bias (if the MOSFETs have higher transconductance than the ones in old 4069s, or if the relationship between the N and P channels has changed over time it might lead to "locking up" more easily if the bias is "out" or different)."
Hopefully this helps you out. Mine was doing nothing but as soon as I swapped out that 62K (R14) for a 100K it started quacking.
:o :o
Awesome build and graphics!
Looks fantastic! the enclosure and also the PCB :)
since im new here, some questions:
madbeans dont offer any SMD pcbs arent they? did you do this whole thing by yourself?
thinking on soldering smd makes my brain hurt already :)
nice job man ;)