BUILD THREAD: MISS 10 VCO 2.0

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E.A.S.
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BUILD THREAD: MISS 10 VCO 2.0

Post by E.A.S. » Fri Jul 20, 2012 6:34 pm

The VCO pcbs are in and will be shipping very soon!
This VCO is different enough to justify starting a separate build thread for this version.

Image
MISS 10 vco 2.0 w/panel by itsfatmike, on Flickr

Image
MISS 10 VCO 2.0 by itsfatmike, on Flickr

Image
MISS 10 VCO 2.0 by itsfatmike, on Flickr
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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schematic.

Post by E.A.S. » Fri Jul 20, 2012 6:35 pm

Schematic.
ImageMISS TEN VCO rev 2.0 by itsfatmike, on Flickr


Wiring diagram.

ImageVCO 2.0 Schematic (PWM) by itsfatmike, on Flickr

Notes:

An Error in my silkscreen! ALL transistors need to be installed "backwards" with regard to the silkscreen.

Vref output is a buffered voltage reference I included for connection to the Hz/v input. you can jumper it directly (as seen in the photograph and schematic) if you don't plan on using the Hz/v input. Or you can "normalize" the Vref to the "switching lug" on the Hz/v input. The Hz/v is not labeled on the wiring diagram, but it is on the pcb. Its between the octave switch and the wave outputs.


The PWM jack would probably be best served with attenuator pot, wired like the pitch cv inputs.

The square output resistors mounted to the jack are 22k (from the pcb to the tip) and 2.7k (from the tip to ground)
Last edited by E.A.S. on Mon Jun 23, 2014 4:46 pm, edited 11 times in total.
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Bill of Materials.

Post by E.A.S. » Fri Jul 20, 2012 6:35 pm

Bill of Materials.

Mouser part #'s included.
Attachments
Miss 10 VCO 2.0 BOM.pdf
(149.69 KiB) Downloaded 323 times
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by pre55ure » Fri Jul 20, 2012 9:56 pm

I want one!
Is it too late to order?

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Post by ringstone » Sat Jul 21, 2012 1:56 am

Hmmm... interesting! Good to see some extra room for the precision resistors. Are the two holes underneath Q6 to enable the use of a 2SC1583 if desired, or am I mistaken?

Also, I assume that the extra opamp on the ramp waveform is to invert it so that it ends up a saw? I still don't understand how it ends up a saw on the MS-20... does one of the filters have an inverted output and the other not?

Tossing up whether to get some of these as well...

Cheers
Blair

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Post by steffensen » Sat Jul 28, 2012 1:19 pm

There's just one thing from the BOM that im not sure on what to get. Perhaps someone could help me locate the right part? Its the SW1 - SCALE - SP4T

Not sure what to look for, never used a switch like this before. Is it a switch trimmer, controlled by VR11?

Edit: Nevermind, found the answer in another thread. :roll:


Are the shipping closing in btw? :)

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Post by E.A.S. » Sat Jul 28, 2012 4:09 pm

steffensen wrote: Are the shipping closing in btw? :)
Actually I've already started shipping some. For people waiting on VCFs Im shipping the boards out in about a week, hopefully sooner.

Re: the c1583, There aren't provisions for the 5 pin SIP package but with a little persuasion, it could be made to work. between the two expo transistors, I put pads for a thru hole tempco as well as the SMT tempco that mouser and places like that have. (see BOM for part #)


-Mike
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by steffensen » Sat Jul 28, 2012 4:28 pm

E.A.S. wrote:
steffensen wrote: Are the shipping closing in btw? :)
Actually I've already started shipping some. For people waiting on VCFs Im shipping the boards out in about a week, hopefully sooner.

-Mike
Great! I'll be making a component order for my VCO's very soon, cant wait!

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Post by E.A.S. » Tue Aug 07, 2012 7:57 pm

wiring diagram added!
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by steffensen » Wed Aug 08, 2012 4:33 am

Looking good. :D

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Post by simfonik » Wed Aug 08, 2012 10:47 am

Are there still v2.0 PCBs available?

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Post by E.A.S. » Wed Aug 08, 2012 4:22 pm

simfonik wrote:Are there still v2.0 PCBs available?
There are extras.

Anyone wanting to order the VCO, the VCF, HADSR, LFO/Noise/S&H, or the Mindreader (External signal processor, with pitch to Voltage convertor and a Hz/V to V/oct convertor)

Feel free to order. Instructions for ordering as well as pricing are located on first post, on each of the respective project threads, linked below in my signature.

Thanks for the interest! :cloud:

-Mike
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by Rod Serling Fan Club » Sun Aug 12, 2012 10:39 pm

Aside from checking the leg placement can I just swap the transistors shown on this schematic/bom on the first PCB?

I'm utterly frustrated with my vco build. It's such a simple PCB but I can't get it to make sound. I think all but 1 of my transistors were alternates as it is and I had to swap them around due to wrong leg placement and now I question datasheets as I'm not 100% certain who the manufacturer was on some I have.

I think I'm ready to replace all the transistors at this point.

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Post by E.A.S. » Sun Aug 12, 2012 11:10 pm

Rod Serling Fan Club wrote:Aside from checking the leg placement can I just swap the transistors shown on this schematic/bom on the first PCB?

I'm utterly frustrated with my vco build. It's such a simple PCB but I can't get it to make sound. I think all but 1 of my transistors were alternates as it is and I had to swap them around due to wrong leg placement and now I question datasheets as I'm not 100% certain who the manufacturer was on some I have.

I think I'm ready to replace all the transistors at this point.
Hi Cameron,

Just to make sure I don't give you bad advice, What transistors are you using? Also, Do you have VCO version 2? (Im guessing that why the post is here. :mrgreen: )

-Mike
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by Rod Serling Fan Club » Mon Aug 13, 2012 11:02 am

E.A.S. wrote:
Rod Serling Fan Club wrote:Aside from checking the leg placement can I just swap the transistors shown on this schematic/bom on the first PCB?

I'm utterly frustrated with my vco build. It's such a simple PCB but I can't get it to make sound. I think all but 1 of my transistors were alternates as it is and I had to swap them around due to wrong leg placement and now I question datasheets as I'm not 100% certain who the manufacturer was on some I have.

I think I'm ready to replace all the transistors at this point.
Hi Cameron,

Just to make sure I don't give you bad advice, What transistors are you using? Also, Do you have VCO version 2? (Im guessing that why the post is here. :mrgreen: )

-Mike
Sorry, I had both threads open while I was troubleshooting last night. I am building from the previously released PCB, from the other thread, with all the obsolete transistors called out in the BOM. I think the only "correct" one I could get was a 2SK30A. Most of the rest are 2SC1685's (including the matched pair) with the exception of F3 where I used a 2N3819. I'm also building this into negativspace's panel and did those mods

Currently I get nothing out of the outputs save for hearing a little click when I turn the octave switch. I've played around with the trimmers, etc. I've swapped all 3 ICs to see if the problem was there. I found that I had mistaken the legs of the 2SC1685's and had remove and change position and solder back in. So now I'm concerned that maybe I damaged one or more of those transistors.

Looking at your new schematic vs the old, it looks like most or all of your transistor swaps are just straight swaps.

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Post by ringstone » Wed Aug 15, 2012 1:05 am

Rod Serling Fan Club wrote:
E.A.S. wrote:
Rod Serling Fan Club wrote:Aside from checking the leg placement can I just swap the transistors shown on this schematic/bom on the first PCB?

I'm utterly frustrated with my vco build. It's such a simple PCB but I can't get it to make sound. I think all but 1 of my transistors were alternates as it is and I had to swap them around due to wrong leg placement and now I question datasheets as I'm not 100% certain who the manufacturer was on some I have.

I think I'm ready to replace all the transistors at this point.
Hi Cameron,

Just to make sure I don't give you bad advice, What transistors are you using? Also, Do you have VCO version 2? (Im guessing that why the post is here. :mrgreen: )

-Mike
Sorry, I had both threads open while I was troubleshooting last night. I am building from the previously released PCB, from the other thread, with all the obsolete transistors called out in the BOM. I think the only "correct" one I could get was a 2SK30A. Most of the rest are 2SC1685's (including the matched pair) with the exception of F3 where I used a 2N3819. I'm also building this into negativspace's panel and did those mods

Currently I get nothing out of the outputs save for hearing a little click when I turn the octave switch. I've played around with the trimmers, etc. I've swapped all 3 ICs to see if the problem was there. I found that I had mistaken the legs of the 2SC1685's and had remove and change position and solder back in. So now I'm concerned that maybe I damaged one or more of those transistors.

Looking at your new schematic vs the old, it looks like most or all of your transistor swaps are just straight swaps.
Just out of interest, you do know about needing a voltage offset to the Hz/V CV in for the V1 PCB to get anything out of it?

Cheers
Blair

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Post by asterisk » Fri Aug 24, 2012 7:48 pm

where the hell is R1? i cant find it on the PCB.
is it where the unmarked SMT / through hole spot is? is that R1?
and is that an either / or situation? you can choose to have TH or SMT, not BOTH?

please let me know, im working on populating my 2.0 board.
thanks.

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Post by E.A.S. » Fri Aug 24, 2012 8:00 pm

asterisk wrote:where the hell is R1? i cant find it on the PCB.
is it where the unmarked SMT / through hole spot is? is that R1?
and is that an either / or situation? you can choose to have TH or SMT, not BOTH?

please let me know, im working on populating my 2.0 board.
thanks.
Its directly above the HZ/v input pad. next to the SAW output pad.

its the resistor in the feedback loop of the saw buffer.

:tu:

-Mike
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by Rod Serling Fan Club » Fri Aug 24, 2012 8:05 pm

ringstone wrote:
Just out of interest, you do know about needing a voltage offset to the Hz/V CV in for the V1 PCB to get anything out of it?

Cheers
Blair
No! What? Where do I pull offset from and how much? Fuck me, I knew it was something I was missing.

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Post by E.A.S. » Fri Aug 24, 2012 8:07 pm

Oh, regarding the Tempco, its either/or. The tempco is R8 (unmarked on the pcb) but is the only spot for SMT. in the same area is pads for TH as well.

-M
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by asterisk » Fri Aug 24, 2012 8:11 pm

ok duh, i was getting R and R1 confused.
thanks.

do you have a mouser part # for the TH version of R8?
i think the part # you have on the BOM is just for the SMT version.

never mind, SP4T switch mouser # is = 105-SR10010F-24NS

thanks!

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Post by E.A.S. » Fri Aug 24, 2012 8:30 pm

ok duh, i was getting R and R1 confused.
thanks.

do you have a mouser part # for the TH version of R8?
i think the part # you have on the BOM is just for the SMT version.

never mind, SP4T switch mouser # is = 105-SR10010F-24NS

thanks!
Mouser doesn't have thru-hole tempco's.

you could get them from bride chamber or MFOS though.

the SMT is WAY cheaper. With a pair of tweezers and a fine tipped soldering iron its not that bad to solder either!

-Mike
Last edited by E.A.S. on Fri Aug 24, 2012 8:41 pm, edited 1 time in total.
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by E.A.S. » Fri Aug 24, 2012 8:35 pm

RSFC, To keep the V1.0 and V2.0 note separate, I replied to you question Here.

-Mike
E.A.S Miss ten series PCBs-----
MISS 10/20/50 VCO,
MISS 10/20 VCF/A,
MISS 10/20 LFO/NOISE/S&H,
MISS 20 MINDREADER PCB/POTs.

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Post by Lockheed » Sun Sep 23, 2012 3:48 pm

I've built the Miss10 v2.0 and it mostly works. Two problems though: first, the triangle wave output is very low amplitude, and it looks like the other end of R76 is not connected to +V on the PCB like the schematic shows or do I read it wrong?
Second, the pulse width pot (1M lin) has a very short working range. The pulse width changes at first, but turning the pot a little more or so, the pulse output suddenly goes dead silent and stays silent for the rest of the range. Sound returns after turning back to low setting. Same happens with external voltage. Looks like the threshold is at 0.7 volts or so, going over that the pulse output goes silent.

I'll get back to testing in a couple of days when I got the time, but if anyone has some thoughts in the meantime, I'd appreciate it.

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Post by ikkini » Fri Oct 05, 2012 2:04 pm

I've started, but can't find R4 on the PCB !!!...

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