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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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 Posted: Thu Aug 09, 2007 6:45 am Post subject:
Re: TH-201 "Mankato" PCBs available
Subject description: Polystyrene caps |
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| Quote: | | Next best choice would probably be polyester, and then mylar or other "film" caps. Worst would be ceramic. |
Shouldn't polypropylene be somewhere between polystyrene and polyester as well? I've seen those recommended as par to polystyrene for VCO timing caps. I have one in both my CGS VCO and ASM 'ultra' VCO. Ray Wilson uses silver mica in his VCO.
And why do I have so many different VCOs?
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Thu Aug 09, 2007 3:18 pm Post subject:
Re: TH-201 "Mankato" PCBs available
Subject description: Polystyrene caps |
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| Etaoin wrote: | | Quote: | | Next best choice would probably be polyester, and then mylar or other "film" caps. Worst would be ceramic. |
Shouldn't polypropylene be somewhere between polystyrene and polyester as well? I've seen those recommended as par to polystyrene for VCO timing caps. I have one in both my CGS VCO and ASM 'ultra' VCO. Ray Wilson uses silver mica in his VCO.
And why do I have so many different VCOs? |
Yup, forgot about polypropelene. Those are almost as good as polystyrene, and for a VCF they should be just fine. Silver Mica is also good, although they tend to be expensive from what I recall. Remember that a VCO only needs one timing cap, while the Mankato (and other 4-pole filters) need four timing caps.
You have so many VCOs because they're cool and they make noise! However, I'll provide my address if you feel you have too many. 
Tim (can you ever have too many VCOs?) Servo |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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| Posted: Thu Aug 09, 2007 10:15 pm Post subject:
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I bought SMT 1K tempco's a Digikey and mounted two directly on the SSM2164. Details at
http://modularsynthesis.com/magicsmoke/mse.htm
| ENDIF wrote: |
My magnificent blue slab arrived a few days ago, and I'm currently knee deep in building it, just gotta find me a 2k tempco.. pesky things. |
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softfin
Joined: Oct 11, 2006
Posts: 271
Location: Far in the north
Audio files: 1
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| Posted: Fri Aug 10, 2007 4:20 am Post subject:
SSM2164s |
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I'm about to start populating two Mankato boards, but noticed that my stock of SSM2164 chips is running low...only 1 left.
So, if anyone knows a good source (preferably in Europe) where to get these for a decent price, please drop a message  |
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etaoin
Joined: Jun 30, 2005
Posts: 761
Location: Utrecht, NL
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| Posted: Fri Aug 10, 2007 5:31 am Post subject:
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Is using two 1k tempcos where a 2k tempco is specified possible in general? I have plenty of 1k tempco's, but no 2k tempco's left.
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Usine Karate
Joined: Jun 09, 2007
Posts: 64
Location: Hackney Wick
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| Posted: Fri Aug 10, 2007 3:45 pm Post subject:
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Just received boards, they look really good, thanks!
Was just wondering if it would be possible to power the Mankato from a 12v supply? And if so what, if any, modifications would be necessary, I noticed that Bugbrand (if you're out there) was running his from 12v, any ideas on modifications?
Ta! |
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davebr
Joined: Jun 09, 2007
Posts: 198
Location: portland, or
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| Posted: Fri Aug 10, 2007 8:50 pm Post subject:
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Just finished my Mankato module. Wow, what a lot of range. I'll have to decide whether to leave it or perhaps trim it down a bit. I used a Stooge bracket for the PCB, Loffink chiclets for the potentiometers, FPE panel, and Vishay 149/248 potentiometers. You can just see the SMT tempcos on the SSM2164. What a neat design. Now to go play ...
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Scott Stites
Janitor
Joined: Dec 23, 2005
Posts: 4127
Location: Mount Hope, KS USA
Audio files: 96
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| Posted: Sat Aug 11, 2007 6:40 am Post subject:
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| Quote: | Thomas Henry,
If you are out there........
I'm also a 19" rack panel head. Have you designed a 19" rack panel for the Mankato filter? I'd be curious to see your design as I imagine others on the forum would. Gotta milk as much input before you're back to class! |
Hey Antman,
Thomas is out there - really out there, in fact. He's in Kansas on vacation, and I expect him to drop by here in an hour or two. I've met with him the last couple of nights, and it's been a really enjoyable experience. I'll ask him about the panel design - I bet he's got one.
There should be time for that before the townspeople get him properly tarred, feathered, and mounted on the rail 
Take care,
Scott
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Sat Aug 11, 2007 7:14 am Post subject:
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| Etaoin wrote: |
Is using two 1k tempcos where a 2k tempco is specified possible in general? I have plenty of 1k tempco's, but no 2k tempco's left. |
yes, i think so, and using 3300ppm would be even better that 3500 FWIK.
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matthias
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Tech Buddy at Random*Source |
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Evan
Joined: Aug 04, 2007
Posts: 35
Location: Australia
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| Posted: Sun Aug 12, 2007 12:05 am Post subject:
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| fonik wrote: | | yes, i think so, and using 3300ppm would be even better that 3500 FWIK. |
So, in general, the lower the ppm value, the better?
There are some 3000ppms (I think) available locally. |
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sneakthief
Joined: Jul 24, 2006
Posts: 569
Location: Berlin
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| Posted: Sun Aug 12, 2007 3:36 am Post subject:
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the theoretical ideal for a thermistor in a VCO is 3300ppm.
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Thomas Henry
Joined: Mar 25, 2007
Posts: 298
Location: Southern Minnesota
Audio files: 2
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| Posted: Wed Aug 15, 2007 8:29 pm Post subject:
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Hello Antman,
| antman49443 wrote: |
I'm also a 19" rack panel head. Have you designed a 19" rack panel for the Mankato filter? I'd be curious to see your design as I imagine others on the forum would. Gotta milk as much input before you're back to class! |
I did do a panel three years ago for the prototype. I searched my decrepit computer, but only found a corrupted file for it. So I guess the answer is "no." Sorry.
Say, when I was traveling the byways of Kansas last week it occurred to me that we crossed paths a decade ago. I finally placed the name with the project. You were working on a standalone Soundblaster unit for MIDI use. I remember I was absolutely swamped keeping MAP afloat and wasn't able to follow up on your ideas. Anyway, is that still a good project, or has time evaporated the surplus market for what you were doing? It sounds really neat.
Thomas Henry |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Wed Aug 15, 2007 9:43 pm Post subject:
TH-201 "Mankato" PCBs available
Subject description: 12V Mankato |
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| Usine Karate wrote: | Just received boards, they look really good, thanks!
Was just wondering if it would be possible to power the Mankato from a 12v supply? And if so what, if any, modifications would be necessary, I noticed that Bugbrand (if you're out there) was running his from 12v, any ideas on modifications?
Ta! |
Hey There,
Yes, you can run a Mankato on ±12V. The output levels will be lower (when oscillating, the sines will probably be closer to ±4V than ±5V), but that will be the most noticeable effect. Also, I would definitely not use PT1 and PT2 on a 12V system (replace them with jumpers or ferrites). They'll drop the supply rails to the chip too low. I think the V/Oct trim will still have enough range, so you're okay there. Of course, as with any system, you don't want to accidentally run a 15V signal into it because that could potentially damage the op amps.
Hope this helps!
Tim (Mankato wrangler) Servo |
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vtl5c3
Joined: Sep 08, 2006
Posts: 425
Location: PDX
Audio files: 13
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| Posted: Thu Aug 16, 2007 1:11 pm Post subject:
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Hi Tim,
Have you replenished your board stock for the Mankato filter?
R. |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Thu Aug 16, 2007 2:11 pm Post subject:
TH-201 "Mankato" PCBs available
Subject description: Board stock |
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| vtl5c3 wrote: | Hi Tim,
Have you replenished your board stock for the Mankato filter?
R. |
Accoording to Fed Ex tracking, they should be here Friday / Monday. This incoming batch is half sold out, so that leaves us about 25 boards. If you've already placed an order, then you're all set. Hopefully I will still have a few to sell at AH Cali in a few weeks!
Tim (not bored of boards) Servo |
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Usine Karate
Joined: Jun 09, 2007
Posts: 64
Location: Hackney Wick
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Posted: Thu Aug 16, 2007 3:56 pm Post subject:
Re: TH-201 "Mankato" PCBs available
Subject description: 12V Mankato |
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Also, I would definitely not use PT1 and PT2 on a 12V system (replace them with jumpers or ferrites).
Thanks for the info Tim. That works out well for me cos I have no idea what these are! I'll stick some ferrites in and see how she blows. |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Thu Aug 16, 2007 6:04 pm Post subject:
TH-201 "Mankato" PCBs available
Subject description: 2K tempcos available |
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By the way,
Magic Smoke has ordered a whole big buncha 2K tempcos and they'll be here next week!
They are 2K 1/4W 2% 3500ppm... in case you were wondering
The prices are:
1 $3.50 +shipping (see below)
2 to 5 $3.00ea +shipping
5 or more $2.75ea +shipping
Shipping for any quantity up to 10 pieces is $1.50US/Canada, $2.50 EU/UK/Australia. If you order up to 10 pieces with a Mankato PCB, then the shipping will the same as the board alone. If you need more than 10 pieces, drop us a line and we'll figure it out. As always, we take PayPal to magsmoke@gmail.com. Thanks for the bandwidth, now get back to soldering!
Tim (or get back to breadboarding) Servo |
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Coriolis
Joined: Apr 11, 2005
Posts: 616
Location: Stilling, Denmark
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| Posted: Mon Aug 20, 2007 7:27 am Post subject:
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Now THAT is a good deal!
Can you add some to my pcb order (assuming you haven't sent the boards to day)?
C |
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3vcos
Joined: Oct 26, 2006
Posts: 106
Location: California
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| Posted: Mon Aug 20, 2007 10:54 am Post subject:
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| Looks like the BOM for the filter is gone and its not on the website. I'd like to have a look before I buy a Mankato. Any chance of reposting it? |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Mon Aug 20, 2007 11:42 am Post subject:
TH-201 "Mankato" PCBs available
Subject description: 2K Tempcos |
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| Coriolis wrote: | Now THAT is a good deal!
Can you add some to my pcb order (assuming you haven't sent the boards to day)?
C |
Absolutely! Just got the new batch of boards, so they'll start shipping in the next few days. Just PayPal us for how many Rs you want (cost of the Rs only, the shipping is no extra cost when included with a board order).
And thanks!
And VERY GLAD E-M IS BACK UP!
Tim (just a happy kind of guy) Servo |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Tue Aug 21, 2007 10:57 am Post subject:
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i am populating the PCB tonight and stumbled over C15. the BOM states three values for that cap: 10pf, 15pf or even 22pf. what is that about? should i stay with the 10pf as for the other caps?
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cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Tue Aug 21, 2007 11:20 am Post subject:
TH-201 "Mankato" PCBs available
Subject description: C15 value |
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| fonik wrote: | | i am populating the PCB tonight and stumbled over C15. the BOM states three values for that cap: 10pf, 15pf or even 22pf. what is that about? should i stay with the 10pf as for the other caps? |
My bad! That SHOULD say "optional, can use 10pF." Thomas' original design had a 22pF in that position, but I haven't noticed any difference with a 10pF in there. This allows you to buy one less part value. I'll fix that and repost the BOM. Thanks!
Tim (fixin' the BOM, Boss!) Servo |
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fonik
Joined: Jun 07, 2006
Posts: 3950
Location: Germany
Audio files: 23
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| Posted: Wed Aug 22, 2007 4:03 am Post subject:
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thanks for your quick reply, tim.
next question: if i'd decided to use only 4 outputs of the mankato, which one would you recommend from a personal point of view? maybe somebody already mentioned this but i probably missed it.
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cheers,
matthias
____________
Big Boss at fonitronik
Tech Buddy at Random*Source |
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Tim Servo
Joined: Jul 16, 2006
Posts: 924
Location: Silicon Valley
Audio files: 11
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Posted: Wed Aug 22, 2007 1:03 pm Post subject:
TH-201 "Mankato" PCBs available
Subject description: Pick 4 outputs |
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| fonik wrote: | thanks for your quick reply, tim.
next question: if i'd decided to use only 4 outputs of the mankato, which one would you recommend from a personal point of view? maybe somebody already mentioned this but i probably missed it. |
************
Well, my original ProtoMankato (Mankatus Tweakus Originalus) features the 12, -12, 24 and -24 outs. Great sound, and I get quadrature sines if I need them. The outputs are like this:
-12dB = 0°
-24dB = 90°
12dB = 180°
24dB = 270°
If you really want a more "electronic" sound you could also chose to use the 6dB and 18dB outputs instead:
6dB = 0°
18dB = 90°
-6dB = 180°
-18dB = 270°
Personally, I'd go with the first option. Of course, if you don't care about using the quadrature sine wave outs, then just pick the 6, 12, 18 and 24 outs. You can still use the Mankato as a VCLFO, but the phases would be:
6dB = 0°
12dB = 225°
18dB = 90°
24dB = 315°
With this setup, you could use external inverters with the 0 and 90 degree outs to get quadrature sines if you really needed them. Might be a pretty attractive option in a modular.
So the final answer is - it depends on how you're going to use the Mankato.
Tim (working all the angles) Servo |
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