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Topics - mcasemo

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Build Reports / Screen Print Trials - Church Rat
« on: November 20, 2019, 10:24:36 PM »
I did a couple of screens for t-shirts that worked out and wanted to try to do some enclosures after seeing some successes posted here (Jacquard ink).  I have one graphic (waterslide) that i thought would be good for screen printing, so I tried to modify the graphic to make the text more obvious and such, anyway, here are the results.   I scuff/brush the surface to get a brushed/bright textured look.   Lessons learned are to widen the text much more, figure out how to center/align better, use the right size squeegee.....    They came out pretty good, just need to clearcoat next and see if I can make the actual pedal :) .

I made the little fixture with MDF and a jig saw, and originally tried to use the enclosure back as a way to restrain the enclosure during printing, but it slid too much and made the graphic placement too unpredictable.   so moved to a spring loaded restraint, then had to shim to get to right height.

waterslide graphic here:

General Questions / AquaboyDX Question
« on: May 02, 2019, 08:26:50 PM »
I'm troubleshooting my Aquaboy Deluxe 2013 build, not yet ready to post a tech help post yet.   Short story, I have high pitched noise, thought it was clock noise, but after removing all the chips its still there.   

The weird thing is that it still passes dry signal, although a bit reduced, with all the chips not installed.  Is that possible?  Just wondering if that is what i should be troubleshooting now.  There is a transistor buffer before the LF353 buffers, could it push signal through the feedback resistors in the op amps stages without the op amps there?

Edit:  It works fine with all the chips in, just has the high pitched noise (just not sure of the source yet)

Build Reports / STOP - AMZ Q&D Compressor 2
« on: February 13, 2019, 06:59:16 PM »
I wanted to make a noise gate to possibly use with the ROG Thunderbird, then a friend suggested the octagon/stop sign would be funny as a noise gate.  So looking for noise gates and found the AMZ Q&D 2, which is a compressor as well and still fits the stop sign joke and has a mute function.

It uses a SSM2166, which is for mic preamps or something, seems to work well.   Handing over to a friend to test out with ambient slide stuff and to test the noise gate (i have no noisy pedals around that work).   "Ratio" should be "Rotate" or "Threshold".  I got confused.

This is my first SMD soldering attempt, chip to adapter board, to stripboard layout.  Not sure i was built for SMD, haha


Tech Help - Projects Page / Dig Dug 2 - odd number steps defaults to 8
« on: November 13, 2018, 10:17:30 PM »
I've built two Dig Dug 2's, one about a year ago, and just finished another.   Both strangely have an issue where sometimes it will go 8 steps when the odd number step sequences are selected.  Meaning for step switch on 1 it goes 8 steps, switch on 2 it goes 2, switch on 3 it goes 8, etc......  First time around i thought it was the switch, cleaned it, the put a new switch in and still same issue.  Now a year later, new switch, new chips, same thing.

Just wanted to check if anyone ever experience this?  I have a few more CD4017's I'm going to switch out, but wondering what could be causing it.  Maybe a different D3 to get a higher voltage to reset?

General Questions / bloodstone / bad stone - adding stages?
« on: June 09, 2018, 06:23:52 PM »
I wanted to try adding stages to a bad stone / bloodstone.   I tried with the MFOS phaser and failed, figured i'd try here and fail again.

Is it possible to add 6 stages by adding 3 4558's and a CD4009, then just feeding them the same VB/VR and signal from the LFO?  Like this?   Or is there something going on with the pin 14/15 stage that i don't understand?

Build Reports / Runoffgroove Thunderbird: Jimmy Page's White Dragon Suit
« on: January 27, 2018, 11:01:36 PM »
I made some PCBs for the ROG Thunderbird, being legit and following Brian Tremblay's licensing agreement (think i might sell a few).  I tried to follow good layout technique, but to be honest, all i know is to try to keep the power separate from the signal, then after a while of routing, that is out the door (I think i ran the Vcc right under one of the voltage diodes). 

First build sounded amazing, but had a high pitch noise, and the white noise was too much.  Tried shielding and that did not work, finally figured out I have bad batch of LT1054's (ebay) (5 KHz switching freq) and once i found a good charge pump, it was much more quiet.    I'm going to avoid charge pumps for a while, struggling with bad ones in a few other builds (although TC1044SPCA's at mouser are like $1 right now).

Anyway, this thing sounds awesome, and super loud.   Octagon enclosure, water slide decal, graphic I got from a "one sixth warrior" forum, a guy in korea made a 1/6 scale jimmy page with this suit and I found his suit graphic.  I wish i could still find the photos of it, it was insane, little Jimmy with little LP and pedal.  I'm trying to pay him as well if I sell them, but he's not responding.

Build Reports / Dig Doug
« on: July 29, 2017, 02:52:00 PM »
Here is my completed dig dug 2, made for a friend who came across Brian's demo and really wanted one.  Searched for famous Doug's for a graphic, came up with Doug Henning.

After drilling, had no room vertically, the board is jammed up against the stompswitch, which is jammed up against the octagon.  Had some trouble with the step switch, think i got some drill shavings in it, it would only work on odd numbers, even would go full 8 steps.  Think i have it clean now.

Put the rez and filter pots on the bottom.  The trem side seems lower gain, i may add a resistor in line with the trim to bump it up a bit.

Love this thing, very fun.


Build Reports / Feral Errol Fuzzes
« on: July 06, 2017, 11:07:48 PM »
A couple of fuzzes I made for a friend with his dog (Chinese Crested, Errol) as the graphic.  First is a 3 knob tonebender, which included a makeshift dying battery knob (not yet added) using a current limiter, LM334Z. Trying to experiment with the EM Distortion Box spectra knob (Charles R. Fischer).  Didnít really work on this, or I did it wrong. Stripboard and tried to pot mount it, so all bunched up at the top of the big octagon.   Clear waterslide decal trying black ink background, never really works right trying to make the printer do full black.  And my fingerprints are preserved i think.

Next is a fuzz dogg PCB, univox superfuzz.  So awesome.  Did the germanium, silicon and no clipping option.   Tone switch scoops the mids.  Love this thing, and you can see I learned how to do graphics a little better (not my photo, stole it from one of his gifted friends).  Sorry no guts of this one

Trying to start posting more stuff I've finished, failed at lots of experiments, but its all fun.

Open Discussion / RIP Ray Wilson
« on: July 23, 2016, 11:34:57 PM »
Looks like Ray Wilson has died.  Sorry to be the guy to post it, just saw the news and didn't see it here, i know there are many synth enthusiasts here.

I recently started into the synth stuff, so have spent a lot of time on his site reading his awesome write-ups of how each module/project works.  Made the subcommander, and emailed him a few times and got responses within the hour, hand drawn redlines on the schematic for mods.  Such an inspiration.

Build Reports / Steal This Pedal - Sunking 2015
« on: July 04, 2016, 07:35:17 PM »
Here is my Sunking 2015 with patriotic colors and Abbie Hoffman tribute.  It cuts out when gain is around 3 O'clock with a weird whine, then comes back, so I'm going to start swapping/checking the charge pump.   Clipping diodes are very subtle to me (on/off/on with red led's and 1N34A), but I'm tone deaf, going to let some friends play it. 

Build Reports / Fuzzler and Psycho Kriller
« on: April 16, 2016, 05:39:42 PM »
I've been making PCB's (seeed, itead) for a few different ideas, one was adding a LFO to a mutron iii.  I did one with the naughty fish, and made my own lfo daughter board.  Then i made a psycho lfo (pseudo random lfo) with it and it sounded pretty cool.  I posted some of it, but lost in the crash.  Psycho Kriller, krill is a filter.  Corny.  Also lost was that pedal as i tore it apart trying to get it to work properly.  So I made some PCB's with it integrated, with envelope, lfo, and psycho lfo mode on a rotary switch.  Glide and Depth of the LFO are on the side, and Rate is on a big knob for foot control.  Have to put in the led's in the krill's eyes.  On the first one was pretty cool having one light up and the other doing the psycho bleep thing.  Still have a glitch with the normal range of the mutron iii and still want to tweak the gains and speeds of each lfo stage for the random mode.

Next is a 4 fuzz pedal that run all in parallel into a mixer, Fuzzler.  All you can eat fuzz, sizzler rip off graphic. The Fuzzes (all silicon) are Jordan Bosstone, the Os' Mutantes (deadpool), WEM Pep Box Rush, and a Fuzzrite.  It is switchable to have the Bosston feed the Os'Mutantes and to have the Fuzzrite feed the Pep box.    PEP box was weird, the trim pot in the schematic would smoke if you turn it all the way one way, could not figure that out, they always still worked, friend called that "the sizzle".  Surprised it all worked otherwise.  The Bosstone and Fuzzrite are lower volume, think i need to muck with the mixer gains for them to even it out.  Going to hand this off to some friends to see if it's any useful.  Probably should put some more radically different sounding fuzzes in here.  The PEP can be kinda gatey, so that's sorta neat to have it gate out and have other fuzzes still sustain.

I PCB mounted everything I could and I now know why you don't want to do that.  Lining up everything causes you to stress the board.  So I have to figure out what i want to set the position, and open up the holes on most of the rest.  After dropping the fuzzler in the box with graphics, it stopped working, got to go heat up some joints and see what happened.

Tech Help - Projects Page / switch noise - fuzz and delay
« on: March 17, 2016, 09:56:51 PM »
I was battling some switch noise on a PCB i made, selmer buzztone into a ZPMII / Deep blue delay.  Thought I had it licked with a bad solder joint, but...

I still get a noise after the switch on of the delay, with fuzz already on, at the time of the delay. So Fuzz on, hit delay, XX ms later little step/sound.  This is more prominent with more fuzz and volume.  Pin 7 and 8 on the PT2399 increase in voltage with the volume/gain of the fuzz.  Switch the fuzz off, they go to similar values (0.6ish).    Is this normal?  I don't know what they do.  Pin 7 goes to higher voltage at the same time of the noise.  Pin 8 switches immediately. 

Any thoughts or ideas welcome. 

Looking at moodring, and having built one, wondering if the true bypass setting that may cause more switch noise is similar, or expected.  I don't want to rip this one apart if i can make it better essentially, haha. 

Build Reports / Church Rat - Rat and Moodring - repost from the crash
« on: March 15, 2016, 07:03:05 PM »
Saw the moodring posts and remembered I posted this one before the crash.  Original Proco Rat, no mods with moodring.  I mixed up the left to right order of the thing, so the switches are labeled wrong essentially.  And I ran the reverb into the rat the first time around and my friend was like, sounds kinda off, so fixed that and it sounds much better (but i'm tone deaf and have no rhythm, so what do i know).  waterslide decal, but sure would like to etch this (stupid difficult etching).

Tech Help - Projects Page / Honeydripper with no sweep
« on: March 07, 2016, 08:02:48 PM »
Iím having trouble with my Honeydripper Rev 1.1.2, non-2015 version, using CA3080ís.  Iím getting filtered sounds, but the envelop is not sweeping the filter.

Iíve reflowed and scraped solder flux and checked for bridges.  I have a USB scope and can follow a signal through IC1 and IC5.   The signal at pin 8 of IC1 is a tall squarish wave, after that it looks like a sine wave signal of similar amplitude as the input signal being inverted out of phase.  Not sure what Iím looking for.  I can see nothing on pin 5 of the CA3080ís.

Maybe my substitutions are to blame?   I used a TC1044SPCA for the charge pump and connected pins 1 and 8.  I used TL074ís in place of the LM324.  R21 is 2k and C2 is 1n
Pictures and voltages below, any help is appreciated, or anything specific I can look for on the scope

Pin   TL074
1   4.95
2   5.11
3   5.06
4   16.36
5   5.12
6   5.12
7   5.12
8   2.1
9   5.11
10   5.12
11   0
12   5.1
13   5.1
14   5.05
Pin   CA380
1   ignore
2   5.1
3   5.1
4   0
5   0.68
6   5.12
7   16.36
8   ignore
Pin   CA380
1   ignore
2   5.1
3   5.1
4   0
5   0.663
6   5.1
7   16.36
8   ignore
Pin   4558
1   5.07
2   5.12
3   5.1
4   0
5   5.1
6   5.12
7   5.11
8   16.37
Pin   TL074
1   1.7
2   1.7
3   1.8
4   16.36
5   4.89
6   5.44
7   1.4
8   4.35
9   2.8
10   2.8
11   0
12   2.8
13   2.8
14   2.8
Pin   TC1044SPCA
1   9.35
2   4.5
3   0
4   137 mv
5   27 mv
6   5.28
7   6.53
8   9.36

Open Discussion / Fuzzes and mixers and buffers and stuff
« on: March 01, 2016, 01:56:51 PM »
Looking for some guidance on the mini mixer (ggg, rg keen) and using with 4 fuzzes in parallel.  Wanted to have a 4 in 1 fuzz pedal where all run to a mixer in parallel.  Also, my schematic has it where you can stack two together, but we can ignore that part of it and assume all run into the mixer's 4 channels.  This may be pretty useless, but thought it might be fun to experiment. 

One question, could each of the volume knobs on each of the fuzzes (currently a fuzzrite, wem pep box rush, os mutantes, and jordan bosstone) serve as the mixer input controls? 

Next question, would anyone expect tone loss without the use of buffers after the fuzzes?  I've read straight guitar signals into mixers can have issue, just not smart enough about these transistor fuzzes and output impedance.

Finally, for a master volume control, could i use the 100k pot on the first stage of the dual op amp, or should it be on the second stage to control gain?

Any advice is appreciated.  I know I can just breadboard this up and test it all, but thought I would pick your brains first. 

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