Yahoo Groups archive

Cgs synth

Index last updated: 2026-04-28 23:16 UTC

Thread

Rise time on dusg

Rise time on dusg

2013-02-17 by adematteo

Hi guys, I am noticing that the rise time on my dusg's doesn't seem to have very much effect in a typical way.

I know this circuit is not a typical envelope generator so i'm curious if it's just the way this circuit works, but if i feed a trigger in and have the rise time set to full cw position it still fires exactly when it gets the trigger but it does take the sharp edge off.What i would expect is that i would get a slow rising voltage ?

Like i said just trying to figure out if i should expect this behavior or if i did something wrong when building it.

Thanks, Tony

Re: Rise time on dusg

2013-02-17 by goldencardigan

Hi Tony,

You should be getting a slow rising voltage as you rightly expect.

Cheers
Dean
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, "adematteo" <adematteo@...> wrote:
>
> Hi guys, I am noticing that the rise time on my dusg's doesn't seem to have very much effect in a typical way.
>
> I know this circuit is not a typical envelope generator so i'm curious if it's just the way this circuit works, but if i feed a trigger in and have the rise time set to full cw position it still fires exactly when it gets the trigger but it does take the sharp edge off.What i would expect is that i would get a slow rising voltage ?
>
> Like i said just trying to figure out if i should expect this behavior or if i did something wrong when building it.
>
> Thanks, Tony
>

Re: Rise time on dusg

2013-02-17 by Jason Nanna

Hi, I just debugged a DUSG yesterday that had this very problem. Check
your transistors, specifically the NPN's in the current source. I had used
2n3906's in combination with 2n5089's and I got this very behavior. I
believe either it was the combination or, much more likely, the transistors
were installed backwards - looking at the datasheet for 2n5089's it looks
as though the silkscreen package outline on the PCB is in the opposite
orientation. I don't think I ever checked these before installing.
Anyway, I swapped them out with 3904's oriented the correct way. These
are (ordinarily) the same as the pinout for 5089's, and opposite the
silkscreen on the PCB.

One thing I noticed is that I still got the rise time to modulate, but the
knob had to be full CW and I needed some significant CV in.
Show quoted textHide quoted text
On Sun, Feb 17, 2013 at 9:55 AM, adematteo <adematteo@...> wrote:

> **
>
>
> Hi guys, I am noticing that the rise time on my dusg's doesn't seem to
> have very much effect in a typical way.
>
> I know this circuit is not a typical envelope generator so i'm curious if
> it's just the way this circuit works, but if i feed a trigger in and have
> the rise time set to full cw position it still fires exactly when it gets
> the trigger but it does take the sharp edge off.What i would expect is that
> i would get a slow rising voltage ?
>
> Like i said just trying to figure out if i should expect this behavior or
> if i did something wrong when building it.
>
> Thanks, Tony
>
>
>


[Non-text portions of this message have been removed]

Re: Rise time on dusg

2013-02-18 by adematteo

Thanks, i just checked and i'm using 5089's with the 3906 so i'll change those out.
Also, i have the 5089's oriented the same way as the silkscreen which i just realized is backwards to the actual pinout.I thought i checked the pinout of the transistors before installing them so i must have missed those.

This probably explains why i could only tune it to about 3500 hz before it would stop cycling ?

Thanks guys, i was ready to accept it as it was so this will make it that much better !
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, Jason Nanna <jasonnanna@...> wrote:
>
> Hi, I just debugged a DUSG yesterday that had this very problem. Check
> your transistors, specifically the NPN's in the current source. I had used
> 2n3906's in combination with 2n5089's and I got this very behavior. I
> believe either it was the combination or, much more likely, the transistors
> were installed backwards - looking at the datasheet for 2n5089's it looks
> as though the silkscreen package outline on the PCB is in the opposite
> orientation. I don't think I ever checked these before installing.
> Anyway, I swapped them out with 3904's oriented the correct way. These
> are (ordinarily) the same as the pinout for 5089's, and opposite the
> silkscreen on the PCB.
>
> One thing I noticed is that I still got the rise time to modulate, but the
> knob had to be full CW and I needed some significant CV in.
>
> On Sun, Feb 17, 2013 at 9:55 AM, adematteo <adematteo@...> wrote:
>
> > **
> >
> >
> > Hi guys, I am noticing that the rise time on my dusg's doesn't seem to
> > have very much effect in a typical way.
> >
> > I know this circuit is not a typical envelope generator so i'm curious if
> > it's just the way this circuit works, but if i feed a trigger in and have
> > the rise time set to full cw position it still fires exactly when it gets
> > the trigger but it does take the sharp edge off.What i would expect is that
> > i would get a slow rising voltage ?
> >
> > Like i said just trying to figure out if i should expect this behavior or
> > if i did something wrong when building it.
> >
> > Thanks, Tony
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>

Re: Rise time on dusg

2013-02-18 by cg_synth

Transistors can be funny things. I made the 116 with every transistor except
for the LED drive in backwards. The bloody thing works.
Ken
Show quoted textHide quoted text
>Thanks, i just checked and i'm using 5089's with the 3906 so i'll change
those out.
>Also, i have the 5089's oriented the same way as the silkscreen which i
just realized is backwards to the actual pinout.I thought i checked the
pinout of the transistors before installing them so i must have missed those.
>
>This probably explains why i could only tune it to about 3500 hz before it
would stop cycling ?
>
>Thanks guys, i was ready to accept it as it was so this will make it that
much better !
>
>--- In cgs_synth@yahoogroups.com, Jason Nanna <jasonnanna@...> wrote:
>>
>> Hi, I just debugged a DUSG yesterday that had this very problem. Check
>> your transistors, specifically the NPN's in the current source. I had used
>> 2n3906's in combination with 2n5089's and I got this very behavior. I
>> believe either it was the combination or, much more likely, the transistors
>> were installed backwards - looking at the datasheet for 2n5089's it looks
>> as though the silkscreen package outline on the PCB is in the opposite
>> orientation. I don't think I ever checked these before installing.
>> Anyway, I swapped them out with 3904's oriented the correct way. These
>> are (ordinarily) the same as the pinout for 5089's, and opposite the
>> silkscreen on the PCB.
>>
>> One thing I noticed is that I still got the rise time to modulate, but the
>> knob had to be full CW and I needed some significant CV in.
>>
>> On Sun, Feb 17, 2013 at 9:55 AM, adematteo <adematteo@...> wrote:
>>
>> > **
>> >
>> >
>> > Hi guys, I am noticing that the rise time on my dusg's doesn't seem to
>> > have very much effect in a typical way.
>> >
>> > I know this circuit is not a typical envelope generator so i'm curious if
>> > it's just the way this circuit works, but if i feed a trigger in and have
>> > the rise time set to full cw position it still fires exactly when it gets
>> > the trigger but it does take the sharp edge off.What i would expect is that
>> > i would get a slow rising voltage ?
>> >
>> > Like i said just trying to figure out if i should expect this behavior or
>> > if i did something wrong when building it.
>> >
>> > Thanks, Tony
>> >
>> >
>> >
>>
>>
>> [Non-text portions of this message have been removed]
>>
>
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>
_______________________________________________________________________
Ken Stone sasami@... otherunicorn@...
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

Re: Rise time on dusg

2013-02-18 by goldencardigan

Ha ha that's awesome! Everytime I think I'm beginning to understand how trannies work in a circuit, I hear something like this and I realise I have absolutely no idea.

Cheers
Dean
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Transistors can be funny things. I made the 116 with every transistor except
> for the LED drive in backwards. The bloody thing works.
> Ken
>
> >Thanks, i just checked and i'm using 5089's with the 3906 so i'll change
> those out.
> >Also, i have the 5089's oriented the same way as the silkscreen which i
> just realized is backwards to the actual pinout.I thought i checked the
> pinout of the transistors before installing them so i must have missed those.
> >
> >This probably explains why i could only tune it to about 3500 hz before it
> would stop cycling ?
> >
> >Thanks guys, i was ready to accept it as it was so this will make it that
> much better !
> >
> >--- In cgs_synth@yahoogroups.com, Jason Nanna <jasonnanna@> wrote:
> >>
> >> Hi, I just debugged a DUSG yesterday that had this very problem. Check
> >> your transistors, specifically the NPN's in the current source. I had used
> >> 2n3906's in combination with 2n5089's and I got this very behavior. I
> >> believe either it was the combination or, much more likely, the transistors
> >> were installed backwards - looking at the datasheet for 2n5089's it looks
> >> as though the silkscreen package outline on the PCB is in the opposite
> >> orientation. I don't think I ever checked these before installing.
> >> Anyway, I swapped them out with 3904's oriented the correct way. These
> >> are (ordinarily) the same as the pinout for 5089's, and opposite the
> >> silkscreen on the PCB.
> >>
> >> One thing I noticed is that I still got the rise time to modulate, but the
> >> knob had to be full CW and I needed some significant CV in.
> >>
> >> On Sun, Feb 17, 2013 at 9:55 AM, adematteo <adematteo@> wrote:
> >>
> >> > **
> >> >
> >> >
> >> > Hi guys, I am noticing that the rise time on my dusg's doesn't seem to
> >> > have very much effect in a typical way.
> >> >
> >> > I know this circuit is not a typical envelope generator so i'm curious if
> >> > it's just the way this circuit works, but if i feed a trigger in and have
> >> > the rise time set to full cw position it still fires exactly when it gets
> >> > the trigger but it does take the sharp edge off.What i would expect is that
> >> > i would get a slow rising voltage ?
> >> >
> >> > Like i said just trying to figure out if i should expect this behavior or
> >> > if i did something wrong when building it.
> >> >
> >> > Thanks, Tony
> >> >
> >> >
> >> >
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >
> >
> >
> >
> >------------------------------------
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >Yahoo! Groups Links
> >
> >
> >
> >
> _______________________________________________________________________
> Ken Stone sasami@... otherunicorn@...
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>

Re: Rise time on dusg

2013-02-18 by adematteo

Ok so i did 1 side with just reversing the 5089's and am getting the same result.I switched the other side w/ 3904's and what do you know i'm getting a nice upwards slope with the rise cranked cw.So, i guess pairing the 3906 and 3904 does matter.
Show quoted textHide quoted text
--- In cgs_synth@yahoogroups.com, sasami@... wrote:
>
> Transistors can be funny things. I made the 116 with every transistor except
> for the LED drive in backwards. The bloody thing works.
> Ken
>
> >Thanks, i just checked and i'm using 5089's with the 3906 so i'll change
> those out.
> >Also, i have the 5089's oriented the same way as the silkscreen which i
> just realized is backwards to the actual pinout.I thought i checked the
> pinout of the transistors before installing them so i must have missed those.
> >
> >This probably explains why i could only tune it to about 3500 hz before it
> would stop cycling ?
> >
> >Thanks guys, i was ready to accept it as it was so this will make it that
> much better !
> >
> >--- In cgs_synth@yahoogroups.com, Jason Nanna <jasonnanna@> wrote:
> >>
> >> Hi, I just debugged a DUSG yesterday that had this very problem. Check
> >> your transistors, specifically the NPN's in the current source. I had used
> >> 2n3906's in combination with 2n5089's and I got this very behavior. I
> >> believe either it was the combination or, much more likely, the transistors
> >> were installed backwards - looking at the datasheet for 2n5089's it looks
> >> as though the silkscreen package outline on the PCB is in the opposite
> >> orientation. I don't think I ever checked these before installing.
> >> Anyway, I swapped them out with 3904's oriented the correct way. These
> >> are (ordinarily) the same as the pinout for 5089's, and opposite the
> >> silkscreen on the PCB.
> >>
> >> One thing I noticed is that I still got the rise time to modulate, but the
> >> knob had to be full CW and I needed some significant CV in.
> >>
> >> On Sun, Feb 17, 2013 at 9:55 AM, adematteo <adematteo@> wrote:
> >>
> >> > **
> >> >
> >> >
> >> > Hi guys, I am noticing that the rise time on my dusg's doesn't seem to
> >> > have very much effect in a typical way.
> >> >
> >> > I know this circuit is not a typical envelope generator so i'm curious if
> >> > it's just the way this circuit works, but if i feed a trigger in and have
> >> > the rise time set to full cw position it still fires exactly when it gets
> >> > the trigger but it does take the sharp edge off.What i would expect is that
> >> > i would get a slow rising voltage ?
> >> >
> >> > Like i said just trying to figure out if i should expect this behavior or
> >> > if i did something wrong when building it.
> >> >
> >> > Thanks, Tony
> >> >
> >> >
> >> >
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >
> >
> >
> >
> >------------------------------------
> >
> >The CGS Modular Synth home page: http://www.cgs.synth.net/
> >Yahoo! Groups Links
> >
> >
> >
> >
> _______________________________________________________________________
> Ken Stone sasami@... otherunicorn@...
> Modular Synth PCBs for sale <http://www.cgs.synth.net/>
> Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>
>

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.