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 Forum index » DIY Hardware and Software » Thomas Henry designs
Thomas Henry UD-1 Drum Voice Page Is Up
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fonik



Joined: Jun 07, 2006
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PostPosted: Sat Jun 16, 2007 3:11 am    Post subject: Reply with quote  Mark this post and the followings unread

bblaze wrote:
So.. I got my expressPCB Up and going!

you talk about the layout i did months ago? that would be great. i never built it or even checked it for errors! it was just for fun...

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matthias
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bblaze



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PostPosted: Sat Jun 16, 2007 7:20 am    Post subject: Reply with quote  Mark this post and the followings unread

hahahaha.. ya.. i spent the $60 for 3 boards.. the first one i botched and got halfway working.. didn't want to trouble shoot it much more.. the 2nd one works great.. gonna modify it a bit and test for buildin gthe 3rd one.. Smile
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fonik



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PostPosted: Sat Jun 16, 2007 2:00 pm    Post subject: Reply with quote  Mark this post and the followings unread

that's realy great. wished i had the same luck with the super controller which i triple checked! . hooked the prototype up and NOTHING worked. i then discovered that the transistors were rotated by 180deg. turned them and still nothing works so i will have a jolly good time of troubleshooting next week...
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Dan Lavin



Joined: Nov 09, 2006
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PostPosted: Sat Jun 16, 2007 5:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Fonik,

Just a suggestion, but you could use the folks on this forum to help check the layout. If 2 heads are better than one and the more the merrier, etc.....
Having stated this, I won't be able to assist as I head out on vacation for a week in the woods with 30+ Boy Scouts! But if you're still out of luck in a week, let me know. I've laid out many pcb's over the years and am willing to assist. Sometimes the mistakes are obvious to someone who hasn't spend hours staring at it already. Just a thought...
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goldenechos



Joined: Jun 06, 2007
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Location: Marshall, NC
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PostPosted: Sun Jun 17, 2007 7:58 am    Post subject: Reply with quote  Mark this post and the followings unread

State Machine wrote:
Quote:

Nice looking board - is the same manufacturer as the SN-Voice? That was one nice board....


Sure they will !! Very Happy

Double Sided
Silk Screened
Solder Mask
Standard Connector Footprints




Bill


I REALLY APPRECIATE THESN-VOICE BOARDS.
HOWEVER I found the layout to be confusing as the Resistor and Cap numbers followed no discernable pattern making parts placement time consuming.

Also, what is the increase in cost to have the boards tinned? I had to use a flux pen on every hole in order to get good joints on both sides.

Again, I REALLY APPRECIATE THE BOARDS, well worth the money spent.

TR
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State Machine
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PostPosted: Sun Jun 17, 2007 7:24 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
I REALLY APPRECIATE THESN-VOICE BOARDS.
HOWEVER I found the layout to be confusing as the Resistor and Cap numbers followed no discernable pattern making parts placement time consuming.


Thanks. As for the layout, I kept the same references for the resistors and capacitors as Thomas Henry intended. This way if anyone had parts for the kit and wanted a PCB for it, they could use the parts they owned. I figured it would be less confusing. Sorry ....... Very Happy

Quote:
Also, what is the increase in cost to have the boards tinned? I had to use a flux pen on every hole in order to get good joints on both sides.


Right now, I am not able to get the board tinned so you will need to use an RMA flux to get good topside flow for my boards. Make sure the iron is clean and set it to about 750 degrees F. You probably know this of course. Very Happy Put a drop of flux and preheat the pad and you should be good to go! You will have to remove the flux when you are done using a flux removal solvent or just alcohol.

Quote:
Again, I REALLY APPRECIATE THE BOARDS, well worth the money spent.


Thanks for your feedback. I will find out if I can get future boards tinned to make the soldering easier for everyone. That is a very good idea and one I will see about for sure. Again, thanks so much.

Bill
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Thomas_Henry



Joined: Jul 24, 2009
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Location: N. Mankato, MN

PostPosted: Mon Aug 10, 2009 9:09 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi gang,

Since things didn't work out this summer for getting six new projects out the door, I decided to catch up on my backlog of old things. Among them was my own hard copy of the UD-1. (My previous version had lived only on a breadboard).

Here's some pictures of it.

Thomas Henry


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vtl5c3



Joined: Sep 08, 2006
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PostPosted: Wed Mar 31, 2010 11:17 am    Post subject: Reply with quote  Mark this post and the followings unread

Quick question: can the 500K pots be substituted with 1M?
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State Machine
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PostPosted: Wed Mar 31, 2010 3:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
Quick question: can the 500K pots be substituted with 1M?


Your referring to the BLEND and DECAY potentiometers. You should be able to do this without any problems. In fact, for the decay, that's the value I used (1M) for my module since I liked the ability to have longer decay times. The blend should not be adversely affected either going to a 1M.

You may want to stick with LINEAR (B Type) potentiometers though as I did not see mention of response Wink

BTW, have you seen the Quad Bass++ circuit boards? Four Bass /Tom voices on a single circuit board.

http://electro-music.com/forum/topic-39402.html&postorder=asc

Bill
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vtl5c3



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PostPosted: Sat Apr 10, 2010 12:58 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you. That's good to know, since I already have a bunch of 1M pots on hand.

Another question: I have a schematic for mods to the UD-1, including adding a volume decay pot, peak limit resistor and lower pitch cap. I cannot find the source for that. Can anyone point me to it? I'm guessing there's some notes that go with it, which I would like to review.
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State Machine
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PostPosted: Sat Apr 10, 2010 2:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Quote:
including adding a volume decay pot, peak limit resistor and lower pitch cap. I cannot find the source for that. Can anyone point me to it? I'm guessing there's some notes that go with it, which I would like to review.


Are there any values or other specifications associated with your present notes? I could help more with that information.

Bill
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vtl5c3



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PostPosted: Sun Apr 11, 2010 7:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Bill,

Here's the diagram I was referring to. I don't take any credit for it, nor can I vouch for its accuracy. It looks like your schematic from the UD1 PCB docs, with some extra stuff added to it.

Romeo


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Adam-V



Joined: Jan 29, 2007
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PostPosted: Wed Jul 28, 2010 4:12 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Guys,

Finally got around to assembling one of my UD-1s and it works a treat but when the decay and the sweep are turned up, the pitch is a little high for my liking. If I was to disconnect the ground side of R1 and connect it to -15V instead, would this have any adverse consequences? I'd like the Initial pot to be able to counteract the higher pitch caused by the above mentioned settings.

Cheers,
Adam-V

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Adam-V



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PostPosted: Sun Aug 01, 2010 6:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Adam-V wrote:
Hi Guys,

Finally got around to assembling one of my UD-1s and it works a treat but when the decay and the sweep are turned up, the pitch is a little high for my liking. If I was to disconnect the ground side of R1 and connect it to -15V instead, would this have any adverse consequences? I'd like the Initial pot to be able to counteract the higher pitch caused by the above mentioned settings.

Cheers,
Adam-V


Anybody???

Cheers,
Adam-V

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bblaze



Joined: Jun 03, 2007
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PostPosted: Thu Sep 20, 2012 6:53 am    Post subject: Reply with quote  Mark this post and the followings unread

cracked my ud-1 open a few days ago for some tweaking.. Any chance you still have the PCB image around still? I can't access it here
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bblaze



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PostPosted: Tue Sep 25, 2012 6:40 am    Post subject: Reply with quote  Mark this post and the followings unread

maybe i'll approach this a different way.. attached is a sample that i *think* sounds incorrect.. This is a triangle wave going thru.. The tail has a sort of metallic sound, almost like the square is bleeding.. The waves from the osc look fine, but i feel like this shouldn't have that high pitched staticy sort of tail.. IT seems to be coming in at either the VCA or the output stage, but i don't really have a meter.. Looking for any advice here.. THANKS!


2 Kick - Copy.wav
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diablojoy



Joined: Sep 07, 2008
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PostPosted: Tue Feb 05, 2013 1:36 am    Post subject: Reply with quote  Mark this post and the followings unread

So i finally got round to finishing my first UD-1
pitch seemed way too high for a tom sound
up around 5Khz for its lowest initial setting- weird
checked everything C8 value, initial voltage,
voltages to the LM566 all seemed fine
even swapped the LM566
ended up trying a few different values in parallel with C8
which lowered the pitch ok
now the original value of C8 is .022uf according to the BOM and schematic
I ended up with 1uf to get down to a reasonable floor tom sound
and not a bad high rack tom sound with the initial pot all the way clockwise
I certainly dont get as low a freq as Bblazes sample
It all seems to be working fine but really that is a massive difference in cap values to get it to there.
any idea's anyone ?
I have another 3 yet to complete , just need to finish panel wiring
so I guess we shall see if they work out similar.

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elmegil



Joined: Mar 20, 2012
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PostPosted: Tue Feb 05, 2013 7:35 am    Post subject: Reply with quote  Mark this post and the followings unread

Could it be that there's a charging resistor error? I would think a 10k instead of a 100k, for example, would behave similarly....
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diablojoy



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PostPosted: Tue Feb 05, 2013 1:53 pm    Post subject: Reply with quote  Mark this post and the followings unread

one of the first things i checked was the resistor values off pin 6
I even lifted one side and metered them directly.
I have a few tubes of LM566 i must go through and check them all as well
some are obviously pulls , some look possibly fake a few look NOS
i shall see if this highlights some variance
the one i have going is working nice with the odd C8 value , i will wire up a second and compare

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