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PropB3
Joined: May 14, 2012 Posts: 7 Location: Germany
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Posted: Mon May 14, 2012 12:21 pm Post subject:
PropB3 - DIY Hammond organ |
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Hello,
if anyone is interested on building a Tonewheelorgan, have a look here:
http://bolltone.de/Projekte/PropB3/PropB3.html
It use a very simple hardware, by using a Parallax Propeller chip.
You only need a handful componets.
have fun
H.Bollig |
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Mongo1
Joined: Aug 11, 2011 Posts: 411 Location: Raleigh NC
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Posted: Mon May 14, 2012 12:47 pm Post subject:
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Very cool - I wish he made a PC board.... |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Mon May 14, 2012 7:22 pm Post subject:
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@PropB3: that's awesome! Yes! I'm surprised more people haven't done this kind of thing outside all the mono synths that seem to be coming out of the woodwork. I'm envisioning mellotrons, Solinas...maybe even a polymoog.
I'm assuming the drawbars, leslie, reverb, keyclick, etc. are controled by midi cc commands?
@Mongo1: PropB3 does have the pcb artwork on page 2/3 of the schematic, but quite frankly, it's simple enough to do on perfboard. I suppose there's not too many of us left that do wirewrap! _________________ Synth DIY since 1977! |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Tue May 15, 2012 12:51 pm Post subject:
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Quote: | I'm assuming the drawbars, leslie, reverb, keyclick, etc. are controled by midi cc commands?
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OK, I see in the zip file "read me" text that is the case: midi cc commands _________________ Synth DIY since 1977! |
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yusynth
Joined: Nov 24, 2005 Posts: 1314 Location: France
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telbonic
Joined: Jan 08, 2010 Posts: 39 Location: uk
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Posted: Thu May 24, 2012 1:30 am Post subject:
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Anyone know of a good place to souce the Propeller uC in the UK? I found farnell are doing them, but for more money than buying the chip direct (albeit with pretty dodgy shipping).
Farnell = £13.84 (ex shipping)
Direct = £8.91 (incl. Dodgy Shipping™) |
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Mongo1
Joined: Aug 11, 2011 Posts: 411 Location: Raleigh NC
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Mon Jun 04, 2012 12:31 pm Post subject:
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PropB3,
The DAC output in your schematic does not seem to match what's recommended with either the TDA1543 or the WM8727 datasheets. I'm guessing it was developed with the TDA and left in place when the WM8727 was substituted. The datasheet output buffer filter for the WM8727 looks a little simpler to implement that your schematic. Any reason I shouldn't used the WM8727 data sheet instead?
I just received all the parts, so when I get a chance, I'll try breadboarding this up. Thanks. _________________ Synth DIY since 1977! |
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PropB3
Joined: May 14, 2012 Posts: 7 Location: Germany
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Posted: Mon Jun 04, 2012 1:00 pm Post subject:
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Dan Lavin wrote: | PropB3,
The DAC output in your schematic does not seem to match what's recommended with either the TDA1543 or the WM8727 datasheets. I'm guessing it was developed with the TDA and left in place when the WM8727 was substituted. The datasheet output buffer filter for the WM8727 looks a little simpler to implement that your schematic. Any reason I shouldn't used the WM8727 data sheet instead?
I just received all the parts, so when I get a chance, I'll try breadboarding this up. Thanks. |
Hello Dan,
the filter at the output from the PropB3 is designed for an other corner frequency than the filter in the datasheet(s). It is not a misstake.
Thanks |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Mon Sep 03, 2012 2:29 pm Post subject:
Subject description: got a head scratcher here! |
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Oddly enough, I've built both the TDA and WM8727 versions of this project and both suffer from almost the same problem!
Anyway, the problem is that the DAC either won't or will barely be heard with +VDD applied. Removing +VDD will give some volume on the WM, but it reaches normal sound levels with neither +VDD and Ground connected. The TDA just needed the +VDD removed. But unfortunately then the output is distorted with either DAC. I am running just one common ground point between digital and analog ground in both cases.
I don't think the problem is the DACs as it would be quite the coincidence that 2 TDAs and 1 WM8727 suffer from the same issue. The firmware seems fine...everything functions as advertised..it's just the distortion.
There is a typo on the WM schematic. The MCLK for the WM8727 is pin 4 not 7 which is +VDD. It's pretty apparent as VDD+ is also marked pin 7.
It 's a fairly simple schematic so I'm confident on all my connections. I've even rebuilt them a few times on the breadboard. I've also used both the LF33CV power supply and my benchtop supply with the same results. I'm afraid I've run out of ideas.
Any words of wisdom from anyone who built this or is familiar with the Propellers or DACs used on this project are appreciated! _________________ Synth DIY since 1977! |
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blackmore
Joined: Oct 02, 2012 Posts: 1 Location: Brasil
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Posted: Fri Oct 05, 2012 7:40 am Post subject:
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Very interesting!!
I have organ simulator, but your project have many good sounds!
Congratulations! |
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THeff
Joined: Sep 01, 2006 Posts: 229 Location: Florida
Audio files: 33
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Posted: Sat Dec 15, 2012 2:04 pm Post subject:
Boxed up B3 Propeller |
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I built this several months ago and finally got it in a box today. I'm very impressed with how it sounds. I used the Parallax P8X32A QuickStart board that I purchased at Radio Shack. The enclosed MP3 demo file used a Yamaha MU-50 for all of the instruments except the organ. All of the Hammond B3 organ sounds are coming from the Propeller and DAC chip. You can get the QuickStart board much cheaper directly from Parallax.
Regards,
Theff
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Green Eyed Lady B3 Propeller.mp3 |
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1208 Time(s) |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Sat Dec 15, 2012 7:48 pm Post subject:
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Awesome Theff. Which version of DAC did you use? _________________ Synth DIY since 1977! |
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THeff
Joined: Sep 01, 2006 Posts: 229 Location: Florida
Audio files: 33
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Posted: Sun Dec 16, 2012 8:17 am Post subject:
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Hi Dan,
Thanks, I used the WM8727 and I could only get the SOIC package, so I mounted it on the bottom of the small PCB. I made a PCB from the original article but have not populated it yet.
Theff |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Sun Dec 16, 2012 8:35 am Post subject:
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Thanks Theff! Ok I can see from your pcb photo you used the SMD DAC. Did you need to modify the code to use the QuickStart board? I suspect the troubles I had were related to my construction so maybe the QuickStart board will help me. _________________ Synth DIY since 1977! |
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THeff
Joined: Sep 01, 2006 Posts: 229 Location: Florida
Audio files: 33
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Posted: Sun Dec 16, 2012 9:54 am Post subject:
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Hi Dan,
I didn't have to make any changes to the SW code, it worked as is. I just added the outboard PCB wth the opto isolator, opamp, and DAC and it worked.
Theff |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
Audio files: 26
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Posted: Mon Jan 28, 2013 7:27 am Post subject:
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Dan Lavin wrote: | This was one of those "shouldn't take more than a week" projects... |
I've had several like that.
Nice job on the panel. Very creative. _________________ Revenge is a dish best served with a fork... to the eye |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Tue Jan 29, 2013 1:28 pm Post subject:
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Thanks, Richard! I thought this one deserved a little better panel than the usual black text box on gold paint that's been my standard lately. _________________ Synth DIY since 1977! |
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THeff
Joined: Sep 01, 2006 Posts: 229 Location: Florida
Audio files: 33
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Posted: Tue Jan 29, 2013 8:33 pm Post subject:
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Hey Dan,
That turned out nice!
Theff |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Sun Feb 10, 2013 8:23 pm Post subject:
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Got the LED hooked up tonight. Just ran the 6N139 output to a 4001 with the output to the led.
Just for grins, I did try an ln324 for the output op amp and the unit oscillated, So you can't use it as a drop in replacement. _________________ Synth DIY since 1977! |
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Spikes
Joined: Feb 10, 2012 Posts: 14 Location: London, UK
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Posted: Mon Mar 04, 2013 3:11 pm Post subject:
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Well this looks great, did anyone build it using the PCB? If so what were the results like? |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Mon Mar 04, 2013 8:41 pm Post subject:
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I built it with the tda version of the pcb. It worked fine. _________________ Synth DIY since 1977! |
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Spikes
Joined: Feb 10, 2012 Posts: 14 Location: London, UK
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Posted: Tue Mar 05, 2013 12:09 am Post subject:
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Thanks for that Dan, that was the version I plan to build as I can get the TDA chip locally.
Before I reach for the etch solution, is anyone willing to program a Propeller chip for me? |
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Dan Lavin
Joined: Nov 09, 2006 Posts: 649 Location: Spring Lake, Mi, USA
Audio files: 21
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Posted: Wed Mar 06, 2013 2:11 pm Post subject:
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I would suggesting spending a few sheckels on the usb programmer. You may decide to switch DAC's or build some other midi project with a propeller. It would probably be cheaper to buy than having someone program one for you and post it to you.
The programming was probably one of the few parts of the project I did correctly first time. It was one of the least painful memories I have building this. All the software is free. _________________ Synth DIY since 1977! |
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