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 Forum index » DIY Hardware and Software
sh101 Subosc help please
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isak



Joined: Dec 13, 2009
Posts: 621
Location: Israel
Audio files: 18

PostPosted: Tue Jun 04, 2013 11:13 pm    Post subject: sh101 Subosc help please Reply with quote  Mark this post and the followings unread

Hi guys.

i really need some help to understand why the hell -2 is not working.
i'm using the ody VCO saw as my source for the subosc.
i design a pcb for this and -1 is working great only -2 and -2 pulse is not working.
i actually dont care about -2 pulse, i only want the -2 to work.
i modded the original scheme a bit cause it wont work with the resistors values it haves, its a small change, pics uploaded...


this is the original scheme...

Posted Image, might have been reduced in size. Click Image to view fullscreen.

this is the moded scheme...(the changes are marked with red round)

Posted Image, might have been reduced in size. Click Image to view fullscreen.

this is my pcb design...(already etched)

Posted Image, might have been reduced in size. Click Image to view fullscreen.


please tell me if my design is not good, and if its good why -2 is not working?

cheers,
Isak E.

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mrmrshoes



Joined: Feb 19, 2011
Posts: 70
Location: Newcastle Upon Tyne
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PostPosted: Wed Jun 05, 2013 3:39 am    Post subject: Reply with quote  Mark this post and the followings unread

I think your layout is good.

but i can see one problem. Going from your component placement layout the 2n3904 pinout looks wrong.

You've got the emitter going to pin 3 and the collector to GND.

i would also use 220k to the base. or the closest value you have to it.

hope you find the problem

mrmrshoes
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isak



Joined: Dec 13, 2009
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Location: Israel
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PostPosted: Wed Jun 05, 2013 5:09 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you for your reply.

yes, your absolutely right!, how i missed that? Embarassed
i hope it will fix the problem, thank you very much.

i'll update soon.

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isak



Joined: Dec 13, 2009
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PostPosted: Wed Jun 05, 2013 11:27 am    Post subject: Reply with quote  Mark this post and the followings unread

ok, ive fixed the transistor pins.
still no change, i dont get -2.

i put 220k pot instead and tried to play with the pot, up and down, still the same.
no -2

Confused

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isak



Joined: Dec 13, 2009
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PostPosted: Wed Jun 05, 2013 1:33 pm    Post subject: Reply with quote  Mark this post and the followings unread

i have found the "problem"!

i was thinking to my self that this circuit is published and must work, i checked and replaced everything except the 68k, i puled it out and put a 100k pot instead, dial the pot up and down hoping to get something and i did Cool
after that i turned off power supply and measure the pot value, it was 6.5k, so i put 6.5k resistor instead 68k and thats it Smile
sound freaking amazing!
love it.

some sound sample (no keyboards just sound)


saw-squ and sub -1 and -2 amazing.wav
 Description:

Download
 Filename:  saw-squ and sub -1 and -2 amazing.wav
 Filesize:  7 MB
 Downloaded:  112 Time(s)


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defog



Joined: Aug 24, 2011
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PostPosted: Wed Jun 05, 2013 6:51 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi there,

I built both the SH-101 4013 based sub oscillator and a 4024 sub oscillator on a breadboard and found they sounded identical, and implementing a 4024 requires nothing but the chip, a cap, and selector switch. The 4024 also gives you options of much lower octaves that can be used as a repeat gate. I've added sub-oscillators to my soundlab ultimate and my own diy synth this way, they're quick and dirty square wave generators. If you have a 4024 laying around, I'd suggest bread boarding one up.

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isak



Joined: Dec 13, 2009
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Location: Israel
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PostPosted: Wed Jun 05, 2013 8:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Thanks.

You have a scheme of the 4024 subosc or how to connect guide?

Cheers

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defog



Joined: Aug 24, 2011
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PostPosted: Thu Jun 06, 2013 6:01 am    Post subject: Reply with quote  Mark this post and the followings unread

Posted Image, might have been reduced in size. Click Image to view fullscreen.

Pretty straight forward. Just put a 10nf cap between pin 14 and gnd. And the reset pin needs to be grounded. Nothing else to it.

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isak



Joined: Dec 13, 2009
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PostPosted: Thu Jun 06, 2013 6:04 am    Post subject: Reply with quote  Mark this post and the followings unread

I must try this simple thing.
You sure it's sounds the same as the 101 sub?

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tokyomatik



Joined: Jan 20, 2011
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PostPosted: Tue Jul 23, 2013 11:10 am    Post subject: Reply with quote  Mark this post and the followings unread

really interested in trying this little circuit...at the moment i don't have any 1n914 but im full with 1n4148s...it will work anyway???
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isak



Joined: Dec 13, 2009
Posts: 621
Location: Israel
Audio files: 18

PostPosted: Tue Jul 23, 2013 11:54 am    Post subject: Reply with quote  Mark this post and the followings unread

Yes it will.

Please note that the 2n3904 is reversed in the parts placement, reverse it.
Another thing..
I advice you to put a trimmer instead of R24 (68k), trim it till you get the -2 to work.

Works like a charm Smile
Cheers and good luck.

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