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 Forum index » DIY Hardware and Software » YuSynth
Yusynth Minimoog Clone
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talkboxert



Joined: Oct 08, 2008
Posts: 14
Location: Amsterdam, Netherlands

PostPosted: Thu Nov 27, 2008 10:52 am    Post subject: Yusynth Minimoog Clone Reply with quote  Mark this post and the followings unread

Hey There.

I ordered a minimoog filter component kit and pcb from bridechamber:

http://www.bridechamber.com/bridechamber.com/Yu%20Transistor%20PCB.html

Anyone here who built this, or can have a look?

2 questions:

1. On the parts placement schematic, that is here:

http://yusynth.net/Modular/Commun/MOOGVCF/Moogfilter-layout.jpg

you see the vertical line of four 47n capacitors.

On the PCB it actually says 22n where those are in the pic. Should I just use the 47n from the component kit and that's it?

The 3 matched transistor pairs (BC547) that lie in between have in my kit been replaced with 3 round IC's that read: LM394CH while bridechamber says on their site:

"includes 3 SSM2210 for matched pairs"

The LM394CH looks allmost the same as this:

http://media.digikey.com/photos/Analog%20Devices%20Photos/505-TO-78.jpg

Are these used instead of the SSM 2210? How do i place them exactly? (pin up or down etc)

Cheers Smile
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Luka



Joined: Jun 29, 2007
Posts: 1002
Location: Melb.

PostPosted: Fri Nov 28, 2008 12:33 am    Post subject: Reply with quote  Mark this post and the followings unread

it says 47n on the schematic so id go with that

lm394 is ok and pin 1 (should have a dot on this corner) should be in the top left corner according of each bc547 pair

check out the datasheet if you need any more info
just google lm394 datasheet

if you look at the bc547 you will notice the lm394 is just 2 transistors and you can match the collectors/emiiters up with the board pattern

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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Fri Nov 28, 2008 1:49 am    Post subject: Reply with quote  Mark this post and the followings unread

Question 1:

both 22nF and 47nF are correct but I have found that I got a faithfuller minimoog sounding using 47nF, therefore I'd suggest that you go for the 47nF caps.

Question 2:
Yes the LM394 are there provided as substitute for the SSM2210 which are already substitue for the BC547s.
See below the layout diagram


pinout.jpg
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LM394 metal can pinout
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LM394-LAYOUT.jpg
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LM394-LAYOUT.jpg



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Yves
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talkboxert



Joined: Oct 08, 2008
Posts: 14
Location: Amsterdam, Netherlands

PostPosted: Fri Nov 28, 2008 1:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Can't be any clearer......Smile
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talkboxert



Joined: Oct 08, 2008
Posts: 14
Location: Amsterdam, Netherlands

PostPosted: Sat Nov 29, 2008 7:50 am    Post subject: What are these for?
Subject description: one more thing.....
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I've finished placing all the components, but now these 2 are left (see pic)

Where do they go?

cheers


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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Sat Nov 29, 2008 8:03 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi
These are inductors (a wire wound around a ferrite bead), they are provided as substitutes for the two 10 ohm resistors (R1 R2), if you check on bridechamber's site you'll see it mentioned :
Quote:
R1 and R2 are replaced with ferrite beads.

Cheers

Yves

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talkboxert



Joined: Oct 08, 2008
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Location: Amsterdam, Netherlands

PostPosted: Sat Nov 29, 2008 8:18 am    Post subject: thankx Reply with quote  Mark this post and the followings unread

thanks again!
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LetterBeacon



Joined: Mar 18, 2008
Posts: 454
Location: London, UK

PostPosted: Sat Nov 29, 2008 9:23 am    Post subject: Reply with quote  Mark this post and the followings unread

I'm hoping to build this soon, and so I'm just collecting the components together. You specify the 47nf caps to be matched to 1% - are these appropriate capacitors?

Also, on the wiring diagram it looks like the resistors all have 5% tolerance. Is that correct, or should I use ones with 1% tolerance?

Thanks a lot.
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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Sat Nov 29, 2008 10:57 am    Post subject: Reply with quote  Mark this post and the followings unread

LetterBeacon wrote:
I'm hoping to build this soon, and so I'm just collecting the components together. You specify the 47nf caps to be matched to 1% - are these appropriate capacitors?

These caps are OK. When I say 1%, this means that you take a batch of 47nF caps and you measure them with a capacimeter, then you select those within 1%. What counts is not the accuracy with respect to 47nF but rather the closeness between the values : they don't need to be 47nF exactly , but the four caps must have the same value within 1%, that is, it can be four caps with a value of 44nF fo example.

LetterBeacon wrote:
Also, on the wiring diagram it looks like the resistors all have 5% tolerance. Is that correct, or should I use ones with 1% tolerance?

Thanks a lot.

5% is OK.

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LetterBeacon



Joined: Mar 18, 2008
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PostPosted: Sat Nov 29, 2008 11:02 am    Post subject: Reply with quote  Mark this post and the followings unread

Great, thanks a lot!
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talkboxert



Joined: Oct 08, 2008
Posts: 14
Location: Amsterdam, Netherlands

PostPosted: Sun Nov 30, 2008 6:44 am    Post subject: Ferrite Beads Reply with quote  Mark this post and the followings unread

Quote:
R1 and R2 are replaced with ferrite beads.


Just out of interest, why is this?

Also to make it sound more close to the original?

Cheers
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Funky40



Joined: Sep 24, 2005
Posts: 875
Location: Swiss
Audio files: 1
G2 patch files: 5

PostPosted: Sun Nov 30, 2008 7:32 am    Post subject: Reply with quote  Mark this post and the followings unread

it is for power decoupling.

read this thread :
http://electro-music.com/forum/topic-25712.html
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LetterBeacon



Joined: Mar 18, 2008
Posts: 454
Location: London, UK

PostPosted: Sun Nov 30, 2008 9:43 am    Post subject: Reply with quote  Mark this post and the followings unread

Yves, just out of interest, what type of capacitor did you use in the circuit? I was going to use those polyester ones, but I've just read this:

Harry Bissell wrote:
For all frequency sensitive applications, film caps are the best choice. Polystyrene is the best, followed by polycarbonate, and polyester (Mylar). Mylar capacitors should always be avoided in Sample/Hold and VCO applications, and used with caution in VCF circuits. If the capacitance value is very small then mica or COG/NPO ceramics may be used.
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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Sun Nov 30, 2008 10:19 am    Post subject: Reply with quote  Mark this post and the followings unread

I use polyester film capacitors for the filter.
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jbeuckm



Joined: Nov 30, 2008
Posts: 3
Location: minneapolis

PostPosted: Sat Dec 13, 2008 1:19 am    Post subject: Self-oscillation
Subject description: can't get it :(
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I have a working model built but can't achieve self oscillation even with the emphasis trimmer and pot all the way up. I have to admit that I did not know to match the 47n capacitors to each other when I picked them. Could mismatched capacitors cause weak emphasis? What else would prevent self-oscillation?

Thank you,
-joe
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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Sat Dec 13, 2008 2:23 am    Post subject: Reply with quote  Mark this post and the followings unread

No, I think it should oscillate even with mismatched ladder caps.
OK check all the solders, swap or change the CA3046s.

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numbertalk



Joined: May 05, 2008
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PostPosted: Sat Dec 13, 2008 7:49 am    Post subject: Reply with quote  Mark this post and the followings unread

What voltage power supply are you using? I first tried this with 2 9V batteries, before I had a bench or cabinet power supply, and I had the same problem. I think it really needs the 15V to oscillate. If you're using a 15VDC supply maybe it's a problem with one of the soldered connections to power on that chip.
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jbeuckm



Joined: Nov 30, 2008
Posts: 3
Location: minneapolis

PostPosted: Sat Dec 13, 2008 11:05 am    Post subject: Reply with quote  Mark this post and the followings unread

numbertalk wrote:
What voltage power supply are you using?


That was it! I thought I was using my 15v rack but it was 12v. It oscillates nicely on +/-15v. Nice filter. Thanks for the help.
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LetterBeacon



Joined: Mar 18, 2008
Posts: 454
Location: London, UK

PostPosted: Sun Jan 11, 2009 10:17 am    Post subject: Reply with quote  Mark this post and the followings unread

I can't seem to find a source for the large 10K and 1K trim pots in the UK. Can anyone point me to where I can find these online?

Thanks!
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yusynth



Joined: Nov 24, 2005
Posts: 1219
Location: France

PostPosted: Sun Jan 11, 2009 10:31 am    Post subject: Reply with quote  Mark this post and the followings unread

LetterBeacon wrote:
I can't seem to find a source for the large 10K and 1K trim pots in the UK. Can anyone point me to where I can find these online?

Thanks!

You'll find these very common components at maplin's :
http://www.maplin.co.uk/Module.aspx?ModuleNo=6499
or at Rapid electronics
http://www.rapidonline.com/Electronic-Components/Resistors-Potentiometer/Preset-Potentiometers/9mm-Cermet-skeleton-trimmer-potentiometer/61601/kw/potentiometer

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LetterBeacon



Joined: Mar 18, 2008
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PostPosted: Sun Jan 11, 2009 10:42 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for that. I went to Maplin yesterday and bought what I thought were the ones you linked to, but it turns out I bought the smaller ones instead. Embarassed
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furio



Joined: Dec 25, 2009
Posts: 103
Location: Austria

PostPosted: Fri Nov 25, 2011 3:40 pm    Post subject: Reply with quote  Mark this post and the followings unread

Tomorrow I try my new filter Very Happy


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