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 Forum index » DIY Hardware and Software » YuSynth
Some Finished Modules
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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Sun Feb 01, 2009 3:01 pm    Post subject: Some Finished Modules Reply with quote  Mark this post and the followings unread

Hi:
I recently finished some modules. There are some knobs missing, but all
are working (except the MIDIbox CV, I have to finish the wiring).
The list:

3 x Yusynth VCO
4 x Yusynth VCA
1 x Yusynth MiniMoog VCF


Yusynth VCA Back.JPG
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Yusynth VCA Front.JPG
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Yusynth VCO Front.JPG
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Modules 1.JPG
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Modules 1.JPG



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Sebo
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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Sun Feb 01, 2009 3:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Some more pictures...


Yusynth MiniMoog VCF Front.JPG
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LetterBeacon



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

PostPosted: Sun Feb 01, 2009 6:21 pm    Post subject: Reply with quote  Mark this post and the followings unread

Good work!

I'm building the Minimoog filter at the moment - did you have any problems when you fired it up at all, or was it a fairly straight forward build?
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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Sun Feb 01, 2009 7:16 pm    Post subject: Reply with quote  Mark this post and the followings unread

The MiniMoog VCF works at first power up (as all the other modules).
I built another MiniMoog VCF for a friend before this one, at that time
I put the TL072 pointing at the wrong direction, and the filter didn't work
until I realized that.
Also my friend forgot the filter powered on (is a stand alone unit) for more
than a day, when he checked, the cutoff frequency knob did't work
anymore. After some troubleshooting I found that one transistor at one of
the CA3046 was dead.

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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Mon Feb 02, 2009 12:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Sebo

Nice job ! These photos will join the galleries on my site Wink
Have fun with them

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numbertalk



Joined: May 05, 2008
Posts: 980
Location: Austin, TX
Audio files: 5

PostPosted: Mon Feb 02, 2009 7:55 am    Post subject: Reply with quote  Mark this post and the followings unread

LetterBeacon wrote:
Good work!

I'm building the Minimoog filter at the moment - did you have any problems when you fired it up at all, or was it a fairly straight forward build?


Not sure how you plan to power it but if you're using less than +/-15VDC the filter won't self oscillate & you won't get deep resonance out of it. When I built mine I hadn't installed a power supply yet and was trying to run off of 2 9V batteries and encountered this issue.
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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Mon Feb 09, 2009 8:22 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Sebo

Your photos are now included in the galleries at my site Wink

Cheers

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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Tue Feb 10, 2009 5:13 pm    Post subject: Reply with quote  Mark this post and the followings unread

I just finished the MIDIbox CV, and then calibrated the 3 VCOs.
They are working great, I get 6 octaves of good tunning in 2 of them and
a little more than 7 in the other.
I'm only having one issue, I can't tune one of the VCOs low enough. The
initial trimmer is all way down but I can reach the low C (C0) for about a semitone.
The other 2 are fine, I tunned the problematic one an octave upper for the
moment but I want to tune it just like the others, I will add a resistor in
serie with the trimmer, I think that will be enough.
The octave selectors worked better than I expected.
Next I will work in the ADSRs and in the Quantix-8.

yusynth wrote:
Hi Sebo

Your photos are now included in the galleries at my site Wink

Cheers


I see them, thank you!!!
And Thank You for sharing all those designs, PCB, info, and being so helpfull!!!!

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yusynth



Joined: Nov 24, 2005
Posts: 1233
Location: France

PostPosted: Wed Feb 11, 2009 12:45 am    Post subject: Reply with quote  Mark this post and the followings unread

Sebo wrote:

I'm only having one issue, I can't tune one of the VCOs low enough. The
initial trimmer is all way down but I can reach the low C (C0) for about a semitone.
The other 2 are fine, I tunned the problematic one an octave upper for the
moment but I want to tune it just like the others, I will add a resistor in
serie with the trimmer, I think that will be enough.


Well this looks like some resistor has not the right value just do a thorough check then. Check also that the tempco resistor is corectly soldered. Then if you don't find a faulty resistor, you may reduce the value of R8 (make it 390K instead of 470K)

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Sebo



Joined: Apr 27, 2007
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PostPosted: Wed Feb 11, 2009 4:46 pm    Post subject: Reply with quote  Mark this post and the followings unread

In the other two VCOs, I had to turn the trim to the limit to get the tunning right,
and in this one I just can't reach it.
I think there are 2 reason for this, one is the fact that I used 200K trimpots
(I can't find 220K), and the other is that the octave selector lower position
is -5V, if I did correctly the math, in your original design the coarse tune
pot turned all CCW will be -5.5V.
I was thinking of changing the trimpot for a 250K one (adding a resistor will be
a little difficult), but changing R8 will be cheaper Smile and faster (I already
have a 390K resistor).
Thanks again.

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Sebo



Joined: Apr 27, 2007
Posts: 540
Location: Argentina

PostPosted: Mon Feb 16, 2009 4:25 pm    Post subject: Reply with quote  Mark this post and the followings unread

I changed R8 for a 390K, and is tunned correctly now.
Also I finished one ADSR and is working right. I haven't had the time to wire the other 3. I will post some pictures soon.
I have a question:
In the Wavefolder can I replace the 2 matched BC547 by a 2SC1583?

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yusynth



Joined: Nov 24, 2005
Posts: 1233
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PostPosted: Mon Feb 16, 2009 11:37 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sure you may replace the two BC547 by a 2SC1583, you will to bend the legs a bit because the PCB wasn't designed for this but it should not be a problem
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Sebo



Joined: Apr 27, 2007
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Location: Argentina

PostPosted: Tue Feb 17, 2009 5:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thank you Yves, I will try the 2SC1583.
Also I want to say that when I measured the tunning of the VCOs I counted
the octaves wrong (I started from oct 1 and should have started from 0).
So 2 of the VCOs tunned correctly for 7 octaves and the third for more
than 8, awesome!!!

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Sebo
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yusynth



Joined: Nov 24, 2005
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PostPosted: Wed Feb 18, 2009 3:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

Sebo wrote:
Thank you Yves, I will try the 2SC1583.
Also I want to say that when I measured the tunning of the VCOs I counted
the octaves wrong (I started from oct 1 and should have started from 0).
So 2 of the VCOs tunned correctly for 7 octaves and the third for more
than 8, awesome!!!


Yea that fits better with what I obtained with mine. Isn't it great !

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Sebo



Joined: Apr 27, 2007
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PostPosted: Fri Feb 20, 2009 12:23 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yeah, is it great!!!!

I finished the first LFO today, but I have some issues, I will post them in
another thread.
Thanks again

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Sebo



Joined: Apr 27, 2007
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PostPosted: Sat Apr 04, 2009 1:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Some more modules finished...


Yusynth ADSR Front.JPG
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ADSR
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Yusynth ADSR Front.JPG



Yusynth ADSR Back.JPG
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ADSR
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Yusynth ADSR Back.JPG



Yusynth LFO Front.JPG
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LFO
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Yusynth LFO Front.JPG



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LFO
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yusynth



Joined: Nov 24, 2005
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PostPosted: Sun Apr 05, 2009 12:42 am    Post subject: Reply with quote  Mark this post and the followings unread

I will add these ASAP in the modules' gallery of my web site. Thanks a lot !
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Sebo



Joined: Apr 27, 2007
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PostPosted: Thu Apr 09, 2009 4:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks Yves!!!
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magman



Joined: Feb 04, 2009
Posts: 361
Location: Liverpool, UK

PostPosted: Fri May 29, 2009 5:04 pm    Post subject: Reply with quote  Mark this post and the followings unread

Completed my first synth module - a Yusynth CV Standards.

This uses a Bridechamber front panel and PCB.


YuSynth CV Standards PCB.JPG
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Populated Bridechamber sourced PCB - just waiting for the chips.
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YuSynth CV Standards PCB.JPG



YuSynth CV Standards Wiring.JPG
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Fully wired panel.
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YuSynth CV Standards Front.JPG
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Bridechamber front panel.
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YuSynth CV Standards Front.JPG


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yusynth



Joined: Nov 24, 2005
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PostPosted: Sat May 30, 2009 1:57 am    Post subject: Reply with quote  Mark this post and the followings unread

Congratulation magman !
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