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fluxmonkey
Joined: Jun 24, 2005
Posts: 708
Location: cleve
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 Posted: Tue Jun 02, 2009 1:43 pm Post subject:
Re: Rev02 Cucamongas are ready to rock!
Subject description: Rev02 Cucamongas are ready to rock! |
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| Tim Servo wrote: | | Tim (trying to think of a city to name the next project after) Servo |
well, according to googlemaps, if you were to walk from Mankato to Cucamonga, the midway point would be near Penrose CO... which has a nice ring to it, as well as some pleasant mathematical connotations...
Or if yr want to go back in MN, there's nearby Le Sueur... w/ connotations of a different sort.
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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johans121
Joined: Jun 19, 2007
Posts: 178
Location: Huntsville, AL (USA)
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Posted: Sat Jun 20, 2009 12:25 am Post subject:
Re: Rev02 Cucamongas are ready to rock!
Subject description: Rev02 Cucamongas are ready to rock! |
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| Tim Servo wrote: | | I'll post the parts list (with Mouser part numbers) in a day or so when I have it completed. |
Tim, any news on the parts list? Got my 5 boards in and I'm anxious to start putting them together!
-Jim
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Don't feed me Indian, you WILL regret it!
-Jim |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Sun Jun 21, 2009 1:58 am Post subject:
Re: Rev02 Cucamongas are ready to rock!
Subject description: Rev02 Cucamongas are ready to rock! |
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| johans121 wrote: | | Tim Servo wrote: | | I'll post the parts list (with Mouser part numbers) in a day or so when I have it completed. |
Tim, any news on the parts list? Got my 5 boards in and I'm anxious to start putting them together!
-Jim |
Hey Jim,
Okee Dokee, here we go! This is a preliminary parts list, but I've been over this several times with my own board and the latest Mouser catalog so hopefully this won't need any significant changes. Take a look and shout out about anything that doesn't seem right or that you don't understand and I'll get it corrected ASAP. I'll have the connector wiring doc and other stuff soon (those docs will be emailed to TH-301 customers). First batch of Rev02 boards sold out really quickly, so thanks to everyone who placed orders! By the way, you might want to fiddle with the values of the Hi and Low range timing caps (C18 and C18b). I've got 2.2 and 10uF, but you might want to try some different values and see what you think. Note that the timing cap needs to be a non-polarized cap. I put in some "pin strips" which are like sockets so I can change the caps without unsoldering, so that was pretty handy.
Tim (socket to me) Servo
| Description: |
| TH-301 Cucamonga Rev 02 Parts List: Updated 2009-June-21 |
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Download (listen) |
| Filename: |
TH-301-02 Parts List.pdf |
| Filesize: |
74.84 KB |
| Downloaded: |
570 Time(s) |
Last edited by Tim Servo on Sun Jun 21, 2009 11:54 pm; edited 1 time in total |
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magman
Joined: Feb 04, 2009
Posts: 363
Location: Liverpool, UK
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| Posted: Sun Jun 21, 2009 3:39 am Post subject:
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Tim,
One possible typo in this list.
R57 is shown with a description value of 300k, but the Mouser part number '271-330K-RC' is for a 330k. Which is correct?
Regards
Magman |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Sun Jun 21, 2009 11:48 pm Post subject:
Subject description: Cucamonga Parts List |
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| magman wrote: | Tim,
One possible typo in this list.
R57 is shown with a description value of 300k, but the Mouser part number '271-330K-RC' is for a 330k. Which is correct?
Regards
Magman |
Ah, good catch on that one. R57 is the resistor that sets the Coarse Tune range. The original design has some "dead area" at the ends of the Coarse Tune pot travel, and this is intended to allow you to offset external control voltages. Some people like this and some don't. Dave Brown made a suggestion to reduce the dead area of the pot's travel, and this is implemented by adding R79 and changing R57 from 100K to 255K. If you want to keep the design with the original Coarse Tune range, put in a jumper for R79 and change R57 back to 100K. I've updated the parts list with the corrected information. Thanks!
Tim (original design) Servo |
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clickmrmike
Joined: Jun 08, 2007
Posts: 48
Location: Gnashville
Audio files: 1
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| Posted: Tue Jun 23, 2009 2:22 pm Post subject:
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So naturally I missed this...and I've had 8038s waiting for this for a year. Will there be another run?
clickmrmike
{helps to put things in the right place...} |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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| Posted: Tue Jun 23, 2009 5:12 pm Post subject:
AS21C "Super LFO" PCBs available |
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| clickmrmike wrote: | So naturally I missed this...and I've had 8038s waiting for this for a year. Will there be another run?
clickmrmike
{helps to put things in the right place...} |
Hey MrMike,
Yes, more TH-301s are on the way. They are supposed to be here right around July 2nd (which is good because the 3rd is a holiday in the US). I have about half of the new batch still available. Glad you've got some 8038s set aside. I've got a bunch more than I'll ever need, so I may sell a few from my personal stash. List members can contact me if they really can't find an 8038.
Tim (still saving a few for himself) Servo |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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| Posted: Tue Jun 30, 2009 11:34 am Post subject:
AS21C "Super LFO" PCBs available |
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New stock of boards has arrived, so we're all set for PCBs for a while. 
Tim (taking inventory in the living room) Servo |
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janvanvolt
Joined: Nov 24, 2005
Posts: 285
Location: Mainz, Germany
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| Posted: Tue Sep 29, 2009 8:30 am Post subject:
Re: AS21C "Super LFO" PCBs available |
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Just wondering (as i am working on my REV02 board): we got a total of 5 pots (given dave's motm design), which values to use for which ( 3 x 100k, 2x1M).
Any wiring diagram (yet)?
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My dIY - http://diy.czmok.de
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Tue Sep 29, 2009 11:24 am Post subject:
Subject description: TH-301 LFO pot values |
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Hey Sound,
Sorry for any confusion on that. The pot values are:
FM Amount (R68) 100k
Coarse Tune (R69) 100k
Fine Tune (R70) 100k
Lag (R72) 1M
Delay (R73) 1M
If you have ANY Magic Smoke board and you haven't received the documentation package via email, give us a shout at Magic Smoke and we'll get that out to you. The TH-301 Connector Wiring and Build Notes documents are attached here for your viewing pleasure
Tim (has connections... via 24 gauge wire) Servo
| Description: |
| TH-301 "Cucamonga" VCLFO Connector Wiring |
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Download (listen) |
| Filename: |
TH-301-02 Connector Wiring.pdf |
| Filesize: |
53.96 KB |
| Downloaded: |
403 Time(s) |
| Description: |
| TH-301 "Cucamonga" VCLFO Build Notes |
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Download (listen) |
| Filename: |
TH-301-02 Build Notes.pdf |
| Filesize: |
41.09 KB |
| Downloaded: |
478 Time(s) |
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Tasmanian Alkaloid
Joined: Jun 29, 2008
Posts: 116
Location: Isle De Mort
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| Posted: Sun Nov 15, 2009 1:48 am Post subject:
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| bubblechamber wrote: | my good deed for the week. 8038 for $3.50 each. please don't take them all...
i order from this guy all the time, small orders can be a little slow, but his prices make up for it.
http://198.170.117.30/IC/HARRIS.html |
Woah! These IC's are now $20 each! |
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emdot_ambient
Joined: Nov 22, 2009
Posts: 667
Location: Frederick, MD
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| Posted: Sun Nov 29, 2009 7:39 pm Post subject:
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Yeah, as I'm finding, most of the interesting projects require hard to source chips  |
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macdee
Joined: Aug 10, 2009
Posts: 8
Location: australia
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| Posted: Tue Dec 01, 2009 12:22 am Post subject:
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| smallbear electronics has the 8038 for $9.95 ..really good service too |
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emdot_ambient
Joined: Nov 22, 2009
Posts: 667
Location: Frederick, MD
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| Posted: Tue Dec 01, 2009 5:28 pm Post subject:
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| macdee wrote: | | smallbear electronics has the 8038 for $9.95 ..really good service too |
I can't seem to find it on their site...link? |
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KrIVIUM2323
Joined: Jan 01, 2009
Posts: 42
Location: Besancon/France/EU
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emdot_ambient
Joined: Nov 22, 2009
Posts: 667
Location: Frederick, MD
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| Posted: Wed Dec 02, 2009 3:12 pm Post subject:
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Thanks...stupid that their search couldn't find "8038"...but I just ordered some.
The only other place I found them was futurlec for about $18 each. |
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whomper
Joined: Dec 15, 2007
Posts: 201
Location: Israel
Audio files: 2
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| Posted: Sat Jan 16, 2010 12:55 pm Post subject:
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Hi,
Have finished building this board a while ago and am facing an issue I can not resolve.
The delay and lag features do not work at all. I mean, tweaking the two pots, I do not get any delay or lag and the LFO starts immediately after a gate signal (when set for the Gate mode).
Any clue to trace the issue?
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Erez Yaary
Home Page: http://www.yaary.com
Buy my CDs at http://www.mellowjet.de |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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| Posted: Sat Jan 16, 2010 4:34 pm Post subject:
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| whomper wrote: | Hi,
The delay and lag features do not work at all. I mean, tweaking the two pots, I do not get any delay or lag and the LFO starts immediately after a gate signal (when set for the Gate mode).
Any clue to trace the issue? |
Are you sure both potentiometers are 1M and not something lower in value?
Did you use a low leakage capacitor for C20? A standard electrolytic would not work on mine. I had to use a low leakage capacitor. You can try measuring the voltage on U2 pin 6. It should ramp up when triggered. I don't remember the details but mine would only ramp up to a certain voltage and not enough to trigger the 555.
I assume the Gate will turn the output off and on - there is no delay/lag. That means most of the circuitry / switch is functional and it has to be something with charging C17. Are you sure C17 is the correct value?
Dave |
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whomper
Joined: Dec 15, 2007
Posts: 201
Location: Israel
Audio files: 2
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| Posted: Mon Jan 18, 2010 5:04 am Post subject:
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When I set the mode switch to Delay, the LFO's output is oscillating, although nothing is triggered in the delay-trig. Also, U2's pin 6 does not ramp up in voltage. It seems like the delay circuit is "always on".
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Erez Yaary
Home Page: http://www.yaary.com
Buy my CDs at http://www.mellowjet.de |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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| Posted: Mon Jan 18, 2010 9:10 pm Post subject:
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| whomper wrote: | | When I set the mode switch to Delay, the LFO's output is oscillating, although nothing is triggered in the delay-trig. Also, U2's pin 6 does not ramp up in voltage. It seems like the delay circuit is "always on". |
Did you read my page?
http://modularsynthesis.com/magicsmoke/as21c-lfo/lfo.htm
and
http://modularsynthesis.com/magicsmoke/as21c-lfo/lfo_mods.htm
Read #7 on the last link. I found there was enough crosstalk and the input sensitivity of the trigger in was high enough that it would trigger with no input. Did you normal the input jack to ground? I normalled the jack and also added a resistor to reduce the input sensitivity.
Dave |
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b-funk
Joined: Jul 17, 2007
Posts: 193
Location: Berlin
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| Posted: Fri Feb 19, 2010 12:57 pm Post subject:
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OK, I have an issue with this one...
After a long time I finally built this one. Most of the circuit works.
I have a perfect triangel, a near perfect sine, gate, trigger, everything ok, but one thing confuses me:
I can't get a ramp! I can see a trinagle wave on the oscilloscope at the ramp output, which swings between 0 and -6 volts. The ramp trimmer does not have any effect, neither does the ramp/saw switch. Btw, it seems that also the symmetry and sine trimmers do have no or little effect, which doesn't bother me too much right now, as I have good triangle and sine waves.
So, what the hell could be wrong?
I'm normally quite good at troubleshooting, and my build skills are, well, good.
I sure followed the usual procedure, tripple checked everything.
I'm clueless, please help 
Best wishes,
Tobias
PS: nearly forgot to mention that I somehow lost the schematics. Can someone maybe send them to me? |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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| Posted: Fri Feb 19, 2010 9:40 pm Post subject:
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| b-funk wrote: | OK, I have an issue with this one...
After a long time I finally built this one. Most of the circuit works.
I have a perfect triangle, a near perfect sine, gate, trigger, everything ok, but one thing confuses me:
I can't get a ramp! I can see a triangle wave on the oscilloscope at the ramp output, which swings between 0 and -6 volts. The ramp trimmer does not have any effect, neither does the ramp/saw switch.
So, what the hell could be wrong?
I'm normally quite good at troubleshooting, and my build skills are, well, good. |
I no longer have my module so I can't take any waveforms for you. Since you have a scope, it will be easier to debug.
The good news is you have a good sine and triangle. You need to check to see if you have a good square wave. It is used to generate the ramp. Check the waveform on the ramp slope switch. Each side of the switch should be a square wave of opposite polarity.
S2a1 controls the gain of U4D. It is probably working OK since the Sine and Triangle waveforms look good. The other half of this switch, S2b1 controls the function of U4D. For sine and triangle, it is just a non-inverting op amp with gain. For ramp, it alternates between an inverting and non-inverting op amp. The square wave controls which function it is. Since you are not seeing a ramp, I think either 2sb1 is mis-wired or the ramp slope circuit is not functioning correctly. The ramp slope circuit is U7 sections B and D.
The ramp connect trimmer should change the DC offset of the triangle waveform considerably. You should be able to see this on the ramp output (even though it is a triangle wave). You can also check it on pin 8 of U3.
You can also look at the waveform on pin 12 of U4. For sine and triangle it will be ground. For ramp it should alternate between ground and sections of the triangle waveform with a negative level shift (somebody check my logic on this - I think you should be able to see that waveform). There was just a thread on synth-diy on creating ramp waveforms from triangle. Check the archives to read the theory. There is a posting (Subject: Re: [sdiy] Triangle-to-saw conversion) on Feb 16th from Tim Parkhurst describing this very circuit.
You're going to have to get a set of schematics to really debug this. Email MagicSmoke to get a replacement.
Dave |
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b-funk
Joined: Jul 17, 2007
Posts: 193
Location: Berlin
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| Posted: Sat Feb 20, 2010 6:59 am Post subject:
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Thanks for the hints, Dave.
In the meantime I remebered that I own a copy of "A Synthesizer for the 21st Century" 
So, schematics are in the house. This and your hints should lead to success.
I'll have a look at it this evening and keep you updated.
Best wishes,
Tobias. |
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b-funk
Joined: Jul 17, 2007
Posts: 193
Location: Berlin
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| Posted: Sun Feb 21, 2010 10:17 am Post subject:
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OK, got it.
It was a broken 4016. Strange enough, I replaced it already 2 times before my initial post - so, 2 bad 4016 in one batch 
Anyways, it's working now. After I calibrated the waves, I had an issue with the gate output, the gate low phase was completely distorted, and just dropped to 1 Volt. A 2M2 resistor in parallel to R74 (also a 2M2) fixed this problem.
Now I just need to check if the gate, trig and footswitch inputs work correctly, and then build my second one
Thanks again for the help.
Best wishes,
Tobias |
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