tag:blogger.com,1999:blog-6374633207560306443.post3207859367504789277..comments2024-01-26T15:46:35.651-05:00Comments on ZEN Instruments: Pearl DRUM-X SchematicZackhttp://www.blogger.com/profile/05528438289236305750noreply@blogger.comBlogger31125tag:blogger.com,1999:blog-6374633207560306443.post-2030788916271486942019-01-16T02:17:27.631-05:002019-01-16T02:17:27.631-05:00This comment has been removed by a blog administrator.mohammadhttps://www.blogger.com/profile/05939939686521415578noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-19232593383228127572019-01-13T11:24:24.569-05:002019-01-13T11:24:24.569-05:00Hi Zack,
Thank you.
I just sent some pictures to...Hi Zack,<br /><br />Thank you.<br /><br />I just sent some pictures to your email address. If you spot anything or need pictures of anything else then please let me know.<br /><br />I suspect I'll need to replace everything. Like I said, it's just been a while.<br /><br />Cheers,<br /><br />ChrisRobinhoodhttps://www.blogger.com/profile/00090863432233043495noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-73697459961145819092019-01-13T10:07:42.601-05:002019-01-13T10:07:42.601-05:00Chris,
You can send pictures to my email, zacknel...Chris,<br /><br />You can send pictures to my email, zacknelson1@gmail.com.<br /><br />There's not much on that power supply board. It wouldn't hurt to just replace every component.<br />If you want to diagnose it a little, you could disconnect it from the main PCB and test each rail. You can also try running the main board off of a bench supply.<br /><br />Let me know what you find.<br /><br /> - ZackZackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-56938463307195232842019-01-13T04:28:21.786-05:002019-01-13T04:28:21.786-05:00Hi Zack,
Thanks for taking the time to respond.
...Hi Zack,<br /><br />Thanks for taking the time to respond.<br /><br />I've looked at the power supply and the only thing I can see is the 7805 voltage regulator looking corroded and split at the top. I can't see where I could add an image to this message as that would explain better.<br /><br />Everything else looks fairly clean and original, so I don't know if I'd be better to replace the regulators and caps in one go as I assume they are original and would probably need replacing anyway?<br /><br />Again, grateful for any advice.<br /><br />All the best,<br /><br />ChrisRobinhoodhttps://www.blogger.com/profile/00090863432233043495noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-42795726524186368882019-01-12T11:07:37.767-05:002019-01-12T11:07:37.767-05:00Hi Chris,
This is almost certainly a power supply...Hi Chris,<br /><br />This is almost certainly a power supply issue. Transformers are typical sources of hum and capacitors tend to pop.<br />I would remove and test anything that looks (or smells!) suspect in the power section.<br /><br />If you can take some pictures, I might be able to identify something.<br /><br /> - ZackZackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-35095731901219207912019-01-12T03:48:22.771-05:002019-01-12T03:48:22.771-05:00Hi,
Really interesting reading this article. I...Hi,<br /><br />Really interesting reading this article. I'm into my synths and managed to picked one of these up. I wanted to get the some mods done, however, when I switched it on it worked for about 5 mins then a hum got louder and then it popped. When I turn it on now the display flashes briefly and then all goes dead.<br /><br />I have a little experience in this field and think it's probably power supply related but wondered if you had any ideas..<br /><br />I would love to get this machine working and wondered if you had an ideas on the cause or where I should start.<br /><br />Really grateful for anything.<br /><br />Best regards,<br /><br />ChrisRobinhoodhttps://www.blogger.com/profile/00090863432233043495noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-18125540385066324392018-03-13T08:28:37.873-04:002018-03-13T08:28:37.873-04:00Sure. I already have PBCs for my internal MIDI ret...Sure. I already have PBCs for my internal MIDI retrofit. There's a general overview:<br />http://zeninstruments.blogspot.com/2018/03/pearl-drum-x-midi-control.htmlZackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-561687218053290422018-03-13T08:22:39.650-04:002018-03-13T08:22:39.650-04:00Guys, can any of you build an external box to sequ...Guys, can any of you build an external box to sequence this via MIDI and control these parameters via knobs and CV inputs? <br />I will pay for it. Thinking to add like a D-sub connector at the rear of the DR-X and that way keep the rack unit neat on the outside.DanLhttps://www.blogger.com/profile/11556163774816869397noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-37844278295737836212018-01-13T13:38:08.422-05:002018-01-13T13:38:08.422-05:00Thanks. i've downloaded the digital schematic ...Thanks. i've downloaded the digital schematic and will look into it. probably i just print it and add my notes to it<br /> Anonymoushttps://www.blogger.com/profile/17308085793599962405noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-76306514230489471882018-01-13T12:34:15.725-05:002018-01-13T12:34:15.725-05:00ah. thanks. will look at it to see if i've mis...ah. thanks. will look at it to see if i've missed something.Anonymoushttps://www.blogger.com/profile/17308085793599962405noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-36432679089492913402018-01-13T10:11:51.017-05:002018-01-13T10:11:51.017-05:00Sorry I took so long, but I've added a PNG of ...Sorry I took so long, but I've added a PNG of the control circuit to my github.Zackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-12618748134567366012018-01-09T05:48:19.702-05:002018-01-09T05:48:19.702-05:00as for the schematic, I am unabl to open it as i d...as for the schematic, I am unabl to open it as i don't have Eagle anymore. I'm on Kicad now as my pc's run Ubuntu linux. could you export your schematics to pdf so i can take a look at them? Anonymoushttps://www.blogger.com/profile/17308085793599962405noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-78630356442449346482018-01-09T05:46:16.342-05:002018-01-09T05:46:16.342-05:00the thing with syncing the two arduinos is: I don&...the thing with syncing the two arduinos is: I don't. they are hooked up to the same serial in and one manages the triggers and program changes, the other manages the cc values and data injection. I've mounted my board on two hexagonal risers on the original screwmounts in the right back corner above the sawtooth/noise generator. I am unable to locate pictures of my setup atm. I also placed the 7808 on the side of the chassis close to the mounting hole for the lid so it gets more cooling. on that spot, the screw for the 7808 sits behind the lid and is invisible. I mage a mistake though as it was a little too close to the mounting hola as the dimple in the side of the lid was bigger than anticipated.Anonymoushttps://www.blogger.com/profile/17308085793599962405noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-23628029960299692332018-01-08T16:26:01.399-05:002018-01-08T16:26:01.399-05:00Now I'm wondering how you synchronized two ard...Now I'm wondering how you synchronized two arduinos. I'm intrigued.<br /><br />I imagine you've got a pretty good understanding of the digital side of it now. Would you mind adding notations/cleaning-up the digital control schematic?<br /><br />I made a few functional, but flawed, PCBs. A new batch is on the way.<br />How do you plan on mounting yours?Zackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-19724689329892081532018-01-08T15:47:52.183-05:002018-01-08T15:47:52.183-05:00yes, it is tricky, hence the two arduinos used for...yes, it is tricky, hence the two arduinos used for everything. timing is very critical and i had to do a lot of direct port manipulation to get it right. but it works flawlessly now, although the eight memory positions are always in a flux now.<br /><br />i'm planning to do a small batch of the pcb's as soon as i have finished the layout.Anonymoushttps://www.blogger.com/profile/17308085793599962405noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-10699913958869820222018-01-08T14:25:02.336-05:002018-01-08T14:25:02.336-05:00Oh, that's really cool. I'd like to see ex...Oh, that's really cool. I'd like to see exactly where in the timing cycle you're controlling the SRAM. That's probably tricky, huh?<br />I bypassed all the digital, sync'd with the main counter chip and injected my own 8-bit CV. I like the added bit-depth, but I do wish that the main display/controls could tie in somehow. There is a toggle to revert back to them though.<br />I like the knobby controller too. Is that another arduino and some muxes? I just use a BCR2000 or Beatstep Pro.Zackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-50352622104168302442018-01-08T13:55:52.756-05:002018-01-08T13:55:52.756-05:00my first midi retrofit was external and only used ...my first midi retrofit was external and only used the trigger and program changes ports on the back, but i gave that one away after finishing the internal one. I've opted to inject data into the sram chip so all the digital to analog stuff is handeled by the drum-x itself and you can see the changes on the display on the front. I even build a 40knob midicontroller to act as a man in the middle and can inject 40 cc values into a existing midi stream: http://photo.simski.org/picture.php?/162/category/11Anonymoushttps://www.blogger.com/profile/17308085793599962405noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-82210687584354521952018-01-08T12:13:06.462-05:002018-01-08T12:13:06.462-05:00Simon,
You're welcome. That's fine detect...Simon,<br /><br />You're welcome. That's fine detective work!<br />I've also made a MIDI retrofit for velocity triggers and all 40 parameter changes. I'll do a write up as well.<br />I look forward to seeing yours. It'll be fun to see two solutions to the same problem. Does your approach use the external connectors?<br />That Moog Satellite sounds very interesting too.<br /><br />Godspeed,<br />ZackZackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-36623599845360563102018-01-08T11:43:13.385-05:002018-01-08T11:43:13.385-05:00thanks for the schematic. i found a defective 1uf ...thanks for the schematic. i found a defective 1uf elco near the noise transistor so after swapping that one out noise was back!<br />in the mean time i've made a midi adapter to trigger, change programs and alter settings via cc messages. was quite a thing to do but it works quite nicely, although i had to use two arduino's to do that due to timing constrains. i'm planning on doing a writeup but am very busy right now at work and working on converting a moog satellite from a thomas organ to something with more knobs and posibilities Anonymoushttps://www.blogger.com/profile/17308085793599962405noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-83468727387366515142017-11-11T19:42:39.394-05:002017-11-11T19:42:39.394-05:00Well, that's pretty cool!
I've spread mys...Well, that's pretty cool!<br /><br />I've spread myself thin at the moment, but I'll try to crack open the DRUM-X again.Zackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-33143618907237935542017-11-11T19:33:23.566-05:002017-11-11T19:33:23.566-05:00Yes I pointed Tom to this post, so he may chime in...Yes I pointed Tom to this post, so he may chime in here....if not I'll let you know of any replies I receive. Turns out Tom is associated with the university of Adelaide, maybe a kilometer from where I live....so he could certainly check out my Drum-X if he became interested.<br /><br />-Chris<br /><br />Chris Fosterhttps://www.blogger.com/profile/00183398863411278358noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-91667613533815634132017-11-11T19:15:30.534-05:002017-11-11T19:15:30.534-05:00little-scale does some very cool stuff, and that&#...little-scale does some very cool stuff, and that's a nice project, but 16 CV outputs will only cover 2 voices if not multiplexed. It's overkill to have more than one DAC output, unless you really want to avoid the muxes for some reason. Just to be clear, both approaches are equally "analog" as the muxes are analog.<br /><br />Regardless, for multi-outs I wouldn't use the 2-output DACs he uses. We don't need 12-bit precision and MIDI only (typically) sends 7-bit anyway. I'd instead jump up to some 8-output ones. I've had success using the MAX528 for example. You can chain 5 of them together to controll all 5 vices.<br /><br />If you don't mind including me in the conversation, I'd like to see what Mr.Tomczak says. I can send you an email so you'll have my address.<br /><br />-ZackZackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-49374632090445431712017-11-11T18:52:48.967-05:002017-11-11T18:52:48.967-05:00I've reached out to Sebastian Tomczak who has ...I've reached out to Sebastian Tomczak who has some nice midi/cv projects on his site, including this one which could be ideal for the analogue approach of Stereoping : https://little-scale.blogspot.com.au/2017/11/usb-midi-to-eight-gates-and-sixteen-cv.htmlChris Fosterhttps://www.blogger.com/profile/00183398863411278358noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-82389776636493483792017-11-11T09:33:18.039-05:002017-11-11T09:33:18.039-05:00Chris,
Yes, the range mods are separate from ever...Chris,<br /><br />Yes, the range mods are separate from everything else. Although, the CV you end up generating may also impact the pitch/decay ranges.<br /><br />Those all look like like good projects to build on. I'm seeing a lot of serial DACs though. Those might be fine, but a simple parallel DAC would make things easier. You'll need to quickly change your CV and keep it in sync with the muxes. A serial DAC introduces a (very small) delay that will slow things down and skew the timing.<br /><br />Keep me posted on any progress.<br /><br />- ZackZackhttps://www.blogger.com/profile/05528438289236305750noreply@blogger.comtag:blogger.com,1999:blog-6374633207560306443.post-63329449820247049762017-11-11T09:14:20.521-05:002017-11-11T09:14:20.521-05:00Thanks Zac,
Regarding the hack to achieve a wider...Thanks Zac,<br /><br />Regarding the hack to achieve a wider range on the controls, would that still need to be done going the midi to CV route?<br /><br />Some of the stuff I did find:<br /><br />https://github.com/FortySevenEffects/arduino_midi_library<br /><br />https://midisizer.com/midi2cv-mk2/<br /><br />http://orchardelica.com/wp/?page_id=558<br /><br />https://www.pjrc.com/teensy/td_libs_MIDI.html<br /><br />- ChrisChris Fosterhttps://www.blogger.com/profile/00183398863411278358noreply@blogger.com