Ever since I read that the Smashing Pumpkin's Siamese Dream album owed a lot of it's fuzz tones to an MSA pedal steel guitar fuzz unit, I've been trying to find out what that fuzz circuit was. I finally settled on the fact that it must be a version of the Jordan Bosstone, specifically the Sho-Sound Nashville version. But I know the EHX Microsynth was also used heavily on the album as well, most likely in combination with the MSA unit to get those really heavy, gated fuzz riffs (sorry Big Muff).
One of the fuzz pedals I breadboarded a while back was an ESR Graphic Fuzz. I didn't have a 741 available for the circuit, so I used a curious IC from a Cadillac 8-track player labeled "DM90", made by AC Delco. Since it was an 8-pin metal can IC, I figured it could be an old 741, so I tried it out.
It worked!
Kind of. The only way to get it to really work well was to put a 10k pot between pins 1 and 5 with the wiper to ground. I thought I was adjusting the offset null, but I was getting this heavily gated fuzz sound, nothing like a 741. It made it sound more like the fuzz tones from a Microsynth. Well, the Microsynth is full of OTAs, so I figured that must account for that unique gated fuzz sound. I ordered a CA3080 and put it in the ESR Graphic Fuzz circuit. This time I set up a 10k pot just on pin 5 to V+ for the gate bias. It worked almost exactly like that old "DM90" IC from the 8-track, so that must have been an old metal can OTA (unfortunately that original metal can IC from the 8-track is dead. If you ever see one for sale anywhere, BUY IT! You can make some incredible fuzz tones with it).
Now back to the Bosstone circuit. I breadboarded that up and got it sounding the way I wanted, then also breadboarded the modified ESR graphic fuzz circuit with an OTA chip in it and ran the two in series.
And there was that fuzz tone! It took a little bit of tweaking on the amplifier bias control, and the filter control, but at full tilt this thing produces a sound that I've only really heard on songs like Cherub Rock. Especially for solos, it changes the way the guitar "feels". I'm worried to disassemble the components to try to put it on a pcb, but I'm going to make sure to document all the connections. I'll have to hand-draw the etch because there are some mods, and I have yet to see an accurate ESR graphic fuzz pcb layout (if there is one I'd like a link :) ).
Here's a picture of the breadboard mess (I am the world's worst breadboarder). I can't believe it makes any sound at all. I'll try to get a soundclip up as well, while it's working :o:
I've since decided to call this project the "Triclops Fuzz" in recognition of Triclops Sound Studios in Atlanta, where Siamese Dream was recorded.
It's crazy genius that you know where to start chasing down this circuit, never mind nail it. Major kudos to you. Looking forward to sound clips and pcb progress. Nice work.
Keep it on the breadboard and just draw a schematic.
I'll make that PCB and send it to you to compare to the breadboard circuit ;)
Don't take it off the breadboard even if you're certain you know what's there! You'd be surprised how easy it is to forget a connection when you go to write the schematic or to have made the "wrong" connection on the breadboard that got the sound you like. Take voltages as well, and if you have the inclination, measure the hfe of your transistors to be sure everything's duplicable.
This is one of the holy grail fuzz tones for sure. :)
Quote from: midwayfair on December 28, 2014, 02:31:52 PM
Don't take it off the breadboard even if you're certain you know what's there! ...
+1 on this. At this point, I leave things on the breadboard until I get back and have verified the PCB. I've had to pickup a few extra breadboards but it's a small price to offset the frustration of not being able to figure out what went wrong in the transfer to PCB.
Awesome! There's also this breadboard pcb. (http://www.adafruit.com/product/571) Because, sometimes, all you need is a prototype 8)
Quote from: derevaun on December 28, 2014, 03:35:54 PM
Awesome! There's also this breadboard pcb. (http://www.adafruit.com/product/571) Because, sometimes, all you need is a prototype 8)
Thanks for this link. That looks very interesting for a project like this. I'll have to take many, many close up pictures so that if I do mess up my connections, I'll have an exact reference. I can't loose this tone!
I have measured a lot of the components in this circuit, including the hfe's on the transistors. It looks like it works best with an hfe around 200 for Q1 and 150-ish for Q2. Lower hfe values tend to get too mushy and wooly sounding with the attack on full. The real key to this circuit is the OTA in that ESR circuit. Jordan bosstones are a bit hollow with not much low end typically. The OTA in the ESR circuit has a ton of bass by itself. Put the two together and you get this nice, full-spectrum fuzz sound, with plenty of midrange definition.
The one odd part is going to be figuring out the power supply. Right now I have to run two separate 9v batteries, since the ESR circuit can't have the negative battery lead directly attached to chassis ground. Since both circuits probably have very limited draw though, I'm sure two batteries would last several months in there, so not much of a hassle.
Ok, here's a quick demo of the fuzztone of this mess. Once again I'm just using my Thomas organ amp, recorded into garageband. I added a little bit of layering and post processing like a touch of flanging, but all the fuzz tones are just this breadboard circuit.
[soundcloud]https://soundcloud.com/larsjm/custom-fuzz[/soundcloud]
Great job Lars! I can't wait to build this... sounds amazing. Im thinking a nice duel pedal with it and a opamp BMP would destroy all that is SP.
Cody
Yeah, if a PCB ever exists for this, you can add me to the list of people who'll want one. (I bet the entire forum probably wants one...)
Sounds awesoooommmmeee!!! I would love a board too if it comes into existence... :)
I'm gonna try to knock out a hand-drawn layout tomorrow, so expect to see those great 70's-style curves. It's overall a really simple circuit, with only two transistors, the CA3080, 12 resistors, 8 caps, and two diodes. The four pots will be labelled: Volume, Attack, Bias, and Filter.
*Update* I'm gonna give the freeware version of Eagle a try, and see if I can make a legit layout for this
I made several modifications today (carefully) to get the Bias and Filter controls to behave. The sweet spots were very narrow with the stock values, and most of the rotation would cause the effect to not work at all, or not do anything to the sound. Now I've got them dialed in to where you get usable tones throughout the entire sweep. These two controls make for a really interesting tone-shaping combo. Instead of the usual treble to bass, these work together to control more of the "presence" and "feel". I was able to drop the second volume pot entirely (it was pointless), so this probably improved the noise level a little bit as well.
The more I jam with this, the more I realize that it's a soloing machine. Something about the upper registers on a Strat just seem to sing, and it's actually easier to play high on the neck, if that makes any sense. I would love to hear this on a vintage JCM800 half-stack.
Man! That sounds killer! :o
Congrats on everything, that is surely one thing to build! :D
Amazing work!
I've only very recently started delving into the world of the Pumkins SD fuzz debate mess so I was really happy to see this.
Would love to buy a PCB if and when one is available. ;D
Sounds good!!
Also, I love the topic's name, it's good to know that some of us have succeeded!
Quote from: Guybrush on December 30, 2014, 09:58:14 AM
Amazing work!
I've only very recently started delving into the world of the Pumkins SD fuzz debate mess so I was really happy to see this.
Would love to buy a PCB if and when one is available. ;D
It really is a mess, isn't it? I would like to get a hold of the original tab book for SD from 1994. Apparently it mentions what effects are used on different parts for some songs. Some of the confusion was fueled by an inside joke between Vig and Corgan on the Vieuphoria video as well, where they kept referring to "running everything through it" when showing various gear (which they probably used all that gear very little, if any). The reality is, no one fuzz box is going to give all the tone on that album, there was just so much layering, post-processing, and oddball combinations of fuzz units. I still think a Microsynth gives the best "SD in a box" performance, since it can also do octaves and bit-crushed gated fuzz.
Really interesting. Sounds killer!
If a board is ever made I want some :)
Encase it in clear resin to immortalize it!
Great sounding, great job, so that means you're not the worlds worst bread boarder!
Creative and hyper-focused got you there bro!
Now you just need to find some eyeball knobs to go with the Triclops theme..
slight highjack - I've pinched a couple of your ideas for my microsynth fuzz I was working on earlier in the year (http://www.madbeanpedals.com/forum/index.php?topic=15892.0 (http://www.madbeanpedals.com/forum/index.php?topic=15892.0))
In particular the 10k pot on pin 5 to v+, which has replaced the whole octave up/squarewave modulator section. Would you say that would be better as a Trimmer or a Pot?
this is the schem I have currently (linking as the image is huge) https://dl.dropboxusercontent.com/u/19219628/squarewave%20stripped.png (https://dl.dropboxusercontent.com/u/19219628/squarewave%20stripped.png). need to order some more boards so I can work on it further
I'm thinking I can probably get rid of the whole +/-9v set up too.
/thread derail
If you can get your schematic locked down up, I'd be happy to tackle a layout for you.
I finally got a layout and BOM posted up in the Member Projects area here:
http://www.madbeanpedals.com/forum/index.php?topic=19356.0 (http://www.madbeanpedals.com/forum/index.php?topic=19356.0)
I would etch a board to verify, but I'm out of etchant and my local RS doesn't carry it anymore!
Quote from: lars on January 16, 2015, 06:35:16 PM
I finally got a layout and BOM posted up in the Member Projects area here:
http://www.madbeanpedals.com/forum/index.php?topic=19356.0 (http://www.madbeanpedals.com/forum/index.php?topic=19356.0)
I would etch a board to verify, but I'm out of etchant and my local RS doesn't carry it anymore!
Check out muriatic acid/hydrogen peroxide as an etchant. Hardware store/drug store would have you covered.
This is an old thread, but I've come back to it several times, and think this is relevant to the topic. I used a Bosstone, muff, and some pitch shifting to get this sound.
This is the closest I've been able to get, with one single guitar. It's in D standard, so I didn't practice it to the actual song and just played it from memory, but was trying to get as close as possible to the sound with one single guitar track. (I'm positive the solos on the album were mostly multitracked and perhaps even comped!)
https://soundcloud.com/christiannoir/smashing-pumpkins-cherub-rock-solo-cover-in-d-standard
Quote from: lars on December 28, 2014, 04:23:29 AM
Ever since I read that the Smashing Pumpkin's Siamese Dream album owed a lot of it's fuzz tones to an MSA pedal steel guitar fuzz unit, I've been trying to find out what that fuzz circuit was. I finally settled on the fact that it must be a version of the Jordan Bosstone, specifically the Sho-Sound Nashville version. But I know the EHX Microsynth was also used heavily on the album as well, most likely in combination with the MSA unit to get those really heavy, gated fuzz riffs (sorry Big Muff).
One of the fuzz pedals I breadboarded a while back was an ESR Graphic Fuzz. I didn't have a 741 available for the circuit, so I used a curious IC from a Cadillac 8-track player labeled "DM90", made by AC Delco. Since it was an 8-pin metal can IC, I figured it could be an old 741, so I tried it out.
It worked!
Kind of. The only way to get it to really work well was to put a 10k pot between pins 1 and 5 with the wiper to ground. I thought I was adjusting the offset null, but I was getting this heavily gated fuzz sound, nothing like a 741. It made it sound more like the fuzz tones from a Microsynth. Well, the Microsynth is full of OTAs, so I figured that must account for that unique gated fuzz sound. I ordered a CA3080 and put it in the ESR Graphic Fuzz circuit. This time I set up a 10k pot just on pin 5 to V+ for the gate bias. It worked almost exactly like that old "DM90" IC from the 8-track, so that must have been an old metal can OTA (unfortunately that original metal can IC from the 8-track is dead. If you ever see one for sale anywhere, BUY IT! You can make some incredible fuzz tones with it).
Now back to the Bosstone circuit. I breadboarded that up and got it sounding the way I wanted, then also breadboarded the modified ESR graphic fuzz circuit with an OTA chip in it and ran the two in series.
And there was that fuzz tone! It took a little bit of tweaking on the amplifier bias control, and the filter control, but at full tilt this thing produces a sound that I've only really heard on songs like Cherub Rock. Especially for solos, it changes the way the guitar "feels". I'm worried to disassemble the components to try to put it on a pcb, but I'm going to make sure to document all the connections. I'll have to hand-draw the etch because there are some mods, and I have yet to see an accurate ESR graphic fuzz pcb layout (if there is one I'd like a link :) ).
Here's a picture of the breadboard mess (I am the world's worst breadboarder). I can't believe it makes any sound at all. I'll try to get a soundclip up as well, while it's working :o:
(http://s11.postimg.org/atea0owub/breadboard.jpg)
I've since decided to call this project the "Triclops Fuzz" in recognition of Triclops Sound Studios in Atlanta, where Siamese Dream was recorded.
Sorry about the necro post but this post was so helpful. I suck at recording. All my recordings are always lacking in the low end but I just wanted to share this take on the Cherub Rock solo. I used a Jordan Boss Tone clone with a Microsynth and a Strymon Deco to clone the tape reel sounds. I covered the whole song but skip to 3:08 for the solo. I'm pretty sure this is the right album chain.
https://youtu.be/QY0a63439bw
dang dude. Absolutely worth the necro!
That's the best cover I have ever heard of Cherub Rock! It's 99.9% perfect. The only thing missing: that awesome Micro Synth "broken decay" that happens at the very end. That broken decay sound was actually the key that made me realize it wasn't just a Big Muff. The Big Muff is really only a small fraction of the "Smashing Pumpkins" sound. I still have a built original version of the Triclops Fuzz on my board. Something special about that circuit. It uses a General Motors DM90 metal can IC that I pulled out of a late 70's Cadillac 8-track radio. To this day, I still have no idea what in the world that IC is, but the fuzz it creates is epic. It's like they took the micro synth square wave tone and shrunk it into an 8-pin IC. Lately I've been blasting it with a Boss OD-2. It's the best lead tone I've ever used.
Thank both of you! Being pointed to the Boss Tone type pedal was a game changer.
I tried to get the glitch broken sound at the end but the Microsynth just doesn't always glitch out the same. You can hear it ringing the chord at the end but it just isn't "it". Lars, do you happen to have a schematic of your Triclops Fuzz? I would love to try it out in place of the Boss Tone clone. There's a few sounds from that album that still haunt me. For example, the opening lead in Hummer after the first octave chord section is finished.
That was huge! Fuzzy octavy sounding goodness.
Sent from my iPhone using Tapatalk
Guess it's time to build a Boss Tone!
Quote from: EddieClark on May 11, 2023, 05:03:07 AM
Lars, do you happen to have a schematic of your Triclops Fuzz?
The key was this demo:
I was amazed at how "Siamese Dream" the ESR graphic fuzz sounded, so I decided to breadboard one. Then I started playing around with the unused pins of a typical 741, because I always wondered what the offset null thing was all about. When I subbed in that old DM90 chip, that was the gamechanger. I suddenly had a gated Micro Synth sound with an extremely simple circuit. So the original Triclops Fuzz is just the ESR Graphic Fuzz circuit with the DM90 chip subbed in for the 741. It does require pins 1 and 5 to be connected to a 10K pot to adjust the "bias" (and once it's dialed in you can pretty much put in the permanent resistor values since a pot doesn't really provide a control). I don't understand the in's and out's of what all is going on...it was all just accidents that worked out. I will gladly share all my files I have on the project, but in the end the key sound hinges on getting that DM90 chip. No other changes or different chips yielded that same incredible sound as the original accident.
Wonder if the dm90 is a rebadged OP90? Or the OP90 is a modern derivative of whatever the DM90 was?
Interesting sound here:
https://youtu.be/UHkcI_Vi3is
if it is the OP90...anybody want to do a group buy? lol they're like $5-10 per at some places, or you can buy out Rochester electronics' remaining stock (or weird-ass min quantity of 149 pcs) at $1.75 per ¯\_(ツ)_/¯ (or pay even more and buy through DigiKey's marketplace option...).
I do want to build one of these, and while other builds have some r@re chippies in them, at least a Rat's OP07 is cheap as chips. Something to consider for myself, anyway.
I think we should start a GoFundMe and get an OP90 to lars for confirmation.
I'll just buy it for the man. Give me a link :)
Side note... I just completely cracked the rhythm sound. I figured out why my rhythm sounds in the covers weren't quite right. This is a short clip from Today. First is just my recorded rhythm guitars. Then my guitars hard cut out and the actual song plays from the same point. Aside from volume level and a little EQ, I consider this nailed. Thoughts? I think a pedal can be built to be the in-between to make this work. The lead guitar sounds rely on the MSA Fuzz/Jordan Boss Tone circuit. The rhythm sound is not but is more than a Muff and Marshall
[soundcloud]https://soundcloud.com/user-534440441/today-clip?si=22eca50849644248abb8279802517dfe&utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing[/soundcloud]
Quote from: jwin615 on May 12, 2023, 12:31:47 PM
Wonder if the dm90 is a rebadged OP90? Or the OP90 is a modern derivative of whatever the DM90 was?
If I had to guess, I would say the DM90 was some kind of OTA, similar to the old CA3080. The pinout is exactly the same as a 741. You can drop the DM90 into a 741 circuit, as long as you use pins 1 and 5 to bias. Otherwise it performs terribly. I tried it in a DOD250 circuit and it worked, but sounded like garbage (I didn't try to bias it). When working correctly it mostly sounds like the gated fuzz of the Data Corruptor. So you're not far off building a Tone Virus and just using the fuzz.
And I'm not hurting for DM90's. In addition to the original one, years ago I bought the last two I had ever seen for sale online anywhere, so I have three...which is probably more than exist on some continents.
I got the itch had to scratch. drew this up—just took the two circuits you mentioned, lars, drew it up in Eagle and added the trimmer
(https://i.imgur.com/G5RFYPB.png)
haven't gotten it proto'd/verified
That looks great! Here was my proposed layout:
(https://i.postimg.cc/7hXFz2yG/layout.jpg)
This was setup to use a CA3080 for the IC, since it sounded and behaved similar to the DM90 chip. At this point in the design I had ditched the ESR fuzz and ripped off the fuzz section of the MicroSynth. So basically this was a mashup of a Jordan Bosstone going into the MicroSynth.
Here are the parts I used:
R1 - 10k
R2 - 10k
R3 - 20k
R4 - 10k
R5 - 220R
R6 - 12k
R7 - 820R
R8 - B50K (Filter)
R9 - B10K (Bias)
R10 - 560k
R11 - 150k
R12 - 560k
R13 - 18k
R14 - 18k
R15 - B100k (Attack)
R16 - A100k (Volume)
C1 - .1uf ceramic (104)
C2 - .1uf ceramic (104)
C3 - .1uf ceramic (104)
C4 - .1uf ceramic (104)
C5 - .022uf Film (223)
C6 - .022uf Film (223)
C7 - 47pf ceramic
C8 - .022uf Film (223)
C9 - 1uf tant or Film (105)*
Q1 - A417 NPN#
Q2 - 2N3638A PNP
IC1 - CA3080
*D1 - 1N4148
*D2 - 1N4148
# - This old transistor has an odd E,C,B configuration. You will have to bend your leads on a standard NPN transistor to conform to the layout. Hfe is in the 200 range.
* - Feel free to experiment with different diode types
The two pads marked "P" connected with a jumper. The two pads marked "Y" & "Z" connected with a long jumper.
I think this was the recording of the circuit with those exact parts (it's been a while since I listened to this clip, I forgot how much that thing ripped!):
[soundcloud]https://soundcloud.com/larsjm/triclops-ms?si=a1e58e6199df4293a61fd9ffe1ea3bac&utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing[/soundcloud]
Quote from: lars on May 20, 2023, 01:10:38 AM
This was setup to use a CA3080 for the IC, since it sounded and behaved similar to the DM90 chip. At this point in the design I had ditched the ESR fuzz and ripped off the fuzz section of the MicroSynth. So basically this was a mashup of a Jordan Bosstone going into the MicroSynth.
Ahhh gotcha. So would you say the MicroSynth's circuit is more in-line (tone-wise) than the Bosstone? I'm assuming since your final design included it, but figured I'd ask anyway.
Quote from: lars on May 20, 2023, 01:10:38 AM
That looks great! Here was my proposed layout:
(https://i.postimg.cc/7hXFz2yG/layout.jpg)
This was setup to use a CA3080 for the IC, since it sounded and behaved similar to the DM90 chip. At this point in the design I had ditched the ESR fuzz and ripped off the fuzz section of the MicroSynth. So basically this was a mashup of a Jordan Bosstone going into the MicroSynth.
Here are the parts I used:
R1 - 10k
R2 - 10k
R3 - 20k
R4 - 10k
R5 - 220R
R6 - 12k
R7 - 820R
R8 - B50K (Filter)
R9 - B10K (Bias)
R10 - 560k
R11 - 150k
R12 - 560k
R13 - 18k
R14 - 18k
R15 - B100k (Attack)
R16 - A100k (Volume)
C1 - .1uf ceramic (104)
C2 - .1uf ceramic (104)
C3 - .1uf ceramic (104)
C4 - .1uf ceramic (104)
C5 - .022uf Film (223)
C6 - .022uf Film (223)
C7 - 47pf ceramic
C8 - .022uf Film (223)
C9 - 1uf tant or Film (105)*
Q1 - A417 NPN#
Q2 - 2N3638A PNP
IC1 - CA3080
*D1 - 1N4148
*D2 - 1N4148
# - This old transistor has an odd E,C,B configuration. You will have to bend your leads on a standard NPN transistor to conform to the layout. Hfe is in the 200 range.
* - Feel free to experiment with different diode types
The two pads marked "P" connected with a jumper. The two pads marked "Y" & "Z" connected with a long jumper.
I think this was the recording of the circuit with those exact parts (it's been a while since I listened to this clip, I forgot how much that thing ripped!):
[soundcloud]https://soundcloud.com/larsjm/triclops-ms?si=a1e58e6199df4293a61fd9ffe1ea3bac&utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing[/soundcloud]
It would be interesting to see more of a stripped down Microsynth circuit with a Boss Tone added at the end. The rhythm sounds are categorically OpAmp Muff. It's the lead sounds that Microsynth and Boss Tone contribute so much to. The key pieces of the Microsynth are the octave effects and the fuzz it contains. Adding the boss tone on top is what sends it over the edge for those super compressed leads. Here's a recording of HKK I did a while back with just the OpAmp into a JCM800 with a G12T-75 recorded with a C414.
[soundcloud]https://soundcloud.com/user-534440441/test2-mp3?si=d080128de31242fbb1b8fcfecbf480f8&utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing[/soundcloud]
Quote from: jessenator on May 20, 2023, 03:59:09 AM
Ahhh gotcha. So would you say the MicroSynth's circuit is more in-line (tone-wise) than the Bosstone? I'm assuming since your final design included it, but figured I'd ask anyway.
I switched because the MicroSynth's circuit worked with the CA3080 I had. At that point, I thought I had fried my original DM90 I was using with the ESR graphic fuzz circuit (turned out, it was just a dead connection on my breadboard). Surprisingly, the ESR graphic fuzz circuit sounds very similar to a Microsynth when the DM90 chip is used. The current "Triclops Fuzz" pedal that I use on my board is just the old ESR circuit with the DM90. Here's some pics:
(https://i.postimg.cc/BQZm63h0/outside-TC.jpg)
(https://i.postimg.cc/Wz102NsY/inside-TC.jpg)
It's a pretty unruly fuzz with a ton of volume on tap. It works best as something you slam with an overdrive or distortion in front. The big red momentary switch is odd. I'm using it in place of what would normally be the filter control on the ESR. For some reason, it turns off the gated effect, so you can get some sustain out of higher notes. It will also freak out sometimes and make some weird buzzing noises when you release it. There's all kinds of weird voltage swings going on, but it's been working fine for years.
Your work is great!
Though I know we are talking about about ESR graphic fuzz and Jordan Bosstone, I'm just a bit confuse without to see any schematics.
Do you keep it "secret" or you just don't have any picture of a final schematic? ;D
UTSource supposedly has some DM90s.
List as DM90, mfg-Delco, package-can
Unfortunately, no other info or photos.
$12 each, $7 USPS shipping
There's a Chinese seller on there with 300 as well. UTSource official says they have 33k...
Worth the $20 gamble? I don't know but here it is.
I submitted an inquiry. We'll see if they respond.
https://www.utsource.net/itm/p/9521661.html
Quote from: jwin615 on May 26, 2023, 01:24:58 PM
UTSource supposedly has some DM90s.
Judging from their stock picture, and the date code of 2002+, it's anybody's guess as to what they're selling. The best source for a real 8-pin DM90 IC is from old AC Delco radios from the 70's.
Whilst this is totally awesome in its own right, for anyone wanting to recreate the SiameseDream era in the meantime, this guy smashes (pun intended) it out the park. The lead sound video is bang on.
https://www.youtube.com/watch?v=dp5K8u3EsKA
https://www.youtube.com/watch?v=KCegzAXgpEA
Quote from: lars on May 27, 2023, 01:28:25 AM
Quote from: jwin615 on May 26, 2023, 01:24:58 PM
UTSource supposedly has some DM90s.
Judging from their stock picture, and the date code of 2002+, it's anybody's guess as to what they're selling. The best source for a real 8-pin DM90 IC is from old AC Delco radios from the 70's.
Lars,
UTSource got back to me after some back and forth. They confirm the Delco DM90s they have are 8 pin and have a total inventory of 7.
The cost + shipping seems a bit much mojo tax for me but figured I'd pass it along.
Hehe thanks! I made those videos.
Quote from: LaceSensor on June 02, 2023, 07:47:01 PM
Whilst this is totally awesome in its own right, for anyone wanting to recreate the SiameseDream era in the meantime, this guy smashes (pun intended) it out the park. The lead sound video is bang on.
https://www.youtube.com/watch?v=dp5K8u3EsKA
https://www.youtube.com/watch?v=KCegzAXgpEA
Lars
Circling back around to this, any chance you'd share your final circuit on this?
I've got an itch that this would definitely scratch!
I'd be interested in seeing a schematic, too. My attempts to form an alloy of the two circuits haven't yielded much success.
I've been lurking on this thread for a while, so seeing some recent activity I also toss in my hat. I would love to see a final schematic! I have also never gotten the "Microsynth" side of the circuit to sound quite right from schematics I've pieced together.
That being said, I did get my hands on some DM-90s and they do make a nice difference. But I've delayed making the MSA + ESR (DM-90) version final on stripboard because I want to compare with the MSA + Microsynth version (if I could get it figured out).
Much appreciation for all the work and creativity that has been done here :D
Interesting thread.
I would also love to see Triclops live again.
This thread got me to pull out a Parasit Studios Eagle claw octave fuzz build... Has a CD4069UBE and some diode stuff going on.