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isak
Joined: Dec 13, 2009 Posts: 847 Location: Israel
Audio files: 18
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Posted: Tue Jun 04, 2013 11:13 pm Post subject:
sh101 Subosc help please |
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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...
this is the moded scheme...(the changes are marked with red round)
this is my pcb design...(already etched)
please tell me if my design is not good, and if its good why -2 is not working?
cheers,
Isak E. _________________ http://www.myspace.com/mgmtrance |
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mrmrshoes
Joined: Feb 19, 2011 Posts: 73 Location: Newcastle Upon Tyne
Audio files: 4
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Posted: Wed Jun 05, 2013 3:39 am Post subject:
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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 Posts: 847 Location: Israel
Audio files: 18
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Posted: Wed Jun 05, 2013 5:09 am Post subject:
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thank you for your reply.
yes, your absolutely right!, how i missed that?
i hope it will fix the problem, thank you very much.
i'll update soon. _________________ http://www.myspace.com/mgmtrance |
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isak
Joined: Dec 13, 2009 Posts: 847 Location: Israel
Audio files: 18
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Posted: Wed Jun 05, 2013 11:27 am Post subject:
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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
_________________ http://www.myspace.com/mgmtrance |
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isak
Joined: Dec 13, 2009 Posts: 847 Location: Israel
Audio files: 18
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defog
Joined: Aug 24, 2011 Posts: 113 Location: Philadelphia
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Posted: Wed Jun 05, 2013 6:51 pm Post subject:
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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. _________________ The Phoenix Vertigo is my Electronic alias. Check out my songs on soundcloud : http://soundcloud.com/charles-stieg/ |
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isak
Joined: Dec 13, 2009 Posts: 847 Location: Israel
Audio files: 18
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Posted: Wed Jun 05, 2013 8:22 pm Post subject:
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Thanks.
You have a scheme of the 4024 subosc or how to connect guide?
Cheers _________________ http://www.myspace.com/mgmtrance |
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defog
Joined: Aug 24, 2011 Posts: 113 Location: Philadelphia
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Posted: Thu Jun 06, 2013 6:01 am Post subject:
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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. _________________ The Phoenix Vertigo is my Electronic alias. Check out my songs on soundcloud : http://soundcloud.com/charles-stieg/ |
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isak
Joined: Dec 13, 2009 Posts: 847 Location: Israel
Audio files: 18
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Posted: Thu Jun 06, 2013 6:04 am Post subject:
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I must try this simple thing.
You sure it's sounds the same as the 101 sub? _________________ http://www.myspace.com/mgmtrance |
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tokyomatik
Joined: Jan 20, 2011 Posts: 171 Location: berlin
Audio files: 6
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Posted: Tue Jul 23, 2013 11:10 am Post subject:
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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: 847 Location: Israel
Audio files: 18
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Posted: Tue Jul 23, 2013 11:54 am Post subject:
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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
Cheers and good luck. _________________ http://www.myspace.com/mgmtrance |
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wackelpeter
Joined: May 05, 2013 Posts: 461 Location: germany
Audio files: 10
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Ray_Ketamu
Joined: Nov 03, 2014 Posts: 48 Location: Germany
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isak
Joined: Dec 13, 2009 Posts: 847 Location: Israel
Audio files: 18
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Ray_Ketamu
Joined: Nov 03, 2014 Posts: 48 Location: Germany
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Posted: Wed Feb 17, 2016 1:53 pm Post subject:
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ah. that was quick thanks. did you try the 18k resistor to ground aproach for square out? didn´t find it in the pcb design. oh and you forgot to change the 15V to the 12V of euro... but very nice indeed. will pair it with two th-555, barton waveanimator and a ringmod finally its DIY again! _________________ Sound: https://soundcloud.com/stream Art: http://ketamuworld.blogspot.de/ |
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Ray_Ketamu
Joined: Nov 03, 2014 Posts: 48 Location: Germany
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isak
Joined: Dec 13, 2009 Posts: 847 Location: Israel
Audio files: 18
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Posted: Thu Feb 18, 2016 2:26 am Post subject:
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I didn't try the 18k to ground but it's easy to implant.
Didn't checked with 12V.
And no, there is no need to -12V _________________ http://www.myspace.com/mgmtrance |
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