Cgs synth

--- In cgs_synth@yahoogroups.com, "fuyuhiko" <hiko_goldenballs@...> wrote:
>
> Hi there.
> This is not a question for the CGS circuits but is for an ADSR envelope
> I've been making.This is the schematics.
>
> [http://yusynth.net/Modular/Commun/ADSR/ADSR-V2-sch-thumb.gif%5d
> <http://yusynth.net/Modular/Commun/ADSR/ADSR-V2-sch.gif>
> Even though I've succeeded to make it on solderless breadboard, I now
> suffer from smoke on the both 10Rs of the power supply. As soon as I
> connect the power it happens.To be honest when I finished soldering
> first time it worked but in an odd way, then I realised that I hadn't
> connected -15V to the pin 11 of the TL074 and connected +15V to pin 5. (
> very careless mistakes) This time there was not any smoke but since I
> connected again.
> I've checked all connections but no idea of how to make it work since
> I've made the same power circuit four times.
> Does anyone suspect any particular parts? Or should I solder it from
> scratch again?
> Sorry for the question that is not for the CGS.
> Kind Regards
>
>
>
>
> [Non-text portions of this message have been removed]
>

> Hi there.
> This is not a question for the CGS circuits but is for an ADSR envelope
> I've been making.This is the schematics.
>
> [http://yusynth.net/Modular/Commun/ADSR/ADSR-V2-sch-thumb.gif%5d
> <http://yusynth.net/Modular/Commun/ADSR/ADSR-V2-sch.gif>
> Even though I've succeeded to make it on solderless breadboard, I now
> suffer from smoke on the both 10Rs of the power supply. As soon as I
> connect the power it happens.To be honest when I finished soldering
> first time it worked but in an odd way, then I realised that I hadn't
> connected -15V to the pin 11 of the TL074 and connected +15V to pin 5. (
> very careless mistakes) This time there was not any smoke but since I
> connected again.
> I've checked all connections but no idea of how to make it work since
> I've made the same power circuit four times.
> Does anyone suspect any particular parts? Or should I solder it from
> scratch again?
> Sorry for the question that is not for the CGS.
> Kind Regards

--- In cgs_synth@yahoogroups.com, Ove Ridé <nitro2k01@...> wrote:
>
> On 18 November 2012 10:16, fuyuhiko <hiko_goldenballs@...> wrote:
> > Hi there.
> > This is not a question for the CGS circuits but is for an ADSR envelope
> > I've been making.This is the schematics.
> >
> > [http://yusynth.net/Modular/Commun/ADSR/ADSR-V2-sch-thumb.gif%5d
> > <http://yusynth.net/Modular/Commun/ADSR/ADSR-V2-sch.gif>
> > Even though I've succeeded to make it on solderless breadboard, I now
> > suffer from smoke on the both 10Rs of the power supply. As soon as I
> > connect the power it happens.To be honest when I finished soldering
> > first time it worked but in an odd way, then I realised that I hadn't
> > connected -15V to the pin 11 of the TL074 and connected +15V to pin 5. (
> > very careless mistakes) This time there was not any smoke but since I
> > connected again.
> > I've checked all connections but no idea of how to make it work since
> > I've made the same power circuit four times.
> > Does anyone suspect any particular parts? Or should I solder it from
> > scratch again?
> > Sorry for the question that is not for the CGS.
> > Kind Regards
>
> Obviously, you have a short somewhere which makes current conduct from
> +15V to -15V. The first sanity test question is, are you sure you
> haven't swapped the positive and negative power supplies, now or at
> any point during the build? This could potentially immediately destroy
> all of the chips. The discrete transistors are also vulnerable, but
> they have big resistors in series in all directions and wouldn't be
> able to cause this kind of major failure.
>
> My advice would be to remove the 555 and the TL074 and first try
> powering up the board without them, then adding them one by one and
> see when the fault happens. If the fault happens without either of the
> chips present, the problem is different. Either just a dumb short
> somewhere, or way too small resistor values somewhere causing what is
> effectively a short, or reverse polarity of the polarized capacitors,
> C1 and C2, which would cause them to conduct a DC current. If the last
> option is the cause of your error, those will likely start emitting
> smoke as well at some point.
>
> In case like these, it's useful to have a bench power supply with
> current limiting, so you can detect a fault like this without having
> to burn components.
>
> --
> /Ove
>
> Blog: <http://blog.gg8.se/>
>
> "Here is Evergreen City. Evergreen�¿ is the color of green forever."
>

On 18 November 2012 19:34, fuyuhiko <hiko_goldenballs@...> wrote:
> Hi Ove.
> Having removed both ICs and replaced those to new ones, it now works
> properly! Thank you very much.
>
> One thing I wondered was on the schematic, there is no connections between
> 0V and ground, however, as it didn't work I connected it and seems fine.
> Is there any circuit which mustn't have that connection??
>
> Anyway thank you very much.
>
> --- In cgs_synth@yahoogroups.com, Ove Ridé <nitro2k01@...> wrote:
>
>
> >
> > On 18 November 2012 10:16, fuyuhiko <hiko_goldenballs@...> wrote:
> > > Hi there.
> > > This is not a question for the CGS circuits but is for an ADSR
> > > envelope
> > > I've been making.This is the schematics.
> > >
> > > [http://yusynth.net/Modular/Commun/ADSR/ADSR-V2-sch-thumb.gif%5d
> > > <http://yusynth.net/Modular/Commun/ADSR/ADSR-V2-sch.gif>
> > > Even though I've succeeded to make it on solderless breadboard, I now
> > > suffer from smoke on the both 10Rs of the power supply. As soon as I
> > > connect the power it happens.To be honest when I finished soldering
> > > first time it worked but in an odd way, then I realised that I hadn't
> > > connected -15V to the pin 11 of the TL074 and connected +15V to pin 5.
> > > (
> > > very careless mistakes) This time there was not any smoke but since I
> > > connected again.
> > > I've checked all connections but no idea of how to make it work since
> > > I've made the same power circuit four times.
> > > Does anyone suspect any particular parts? Or should I solder it from
> > > scratch again?
> > > Sorry for the question that is not for the CGS.
> > > Kind Regards
> >
> > Obviously, you have a short somewhere which makes current conduct from
> > +15V to -15V. The first sanity test question is, are you sure you
> > haven't swapped the positive and negative power supplies, now or at
> > any point during the build? This could potentially immediately destroy
> > all of the chips. The discrete transistors are also vulnerable, but
> > they have big resistors in series in all directions and wouldn't be
> > able to cause this kind of major failure.
> >
> > My advice would be to remove the 555 and the TL074 and first try
> > powering up the board without them, then adding them one by one and
> > see when the fault happens. If the fault happens without either of the
> > chips present, the problem is different. Either just a dumb short
> > somewhere, or way too small resistor values somewhere causing what is
> > effectively a short, or reverse polarity of the polarized capacitors,
> > C1 and C2, which would cause them to conduct a DC current. If the last
> > option is the cause of your error, those will likely start emitting
> > smoke as well at some point.
> >
> > In case like these, it's useful to have a bench power supply with
> > current limiting, so you can detect a fault like this without having
> > to burn components.
> >
> > --
> > /Ove
> >
> > Blog: <http://blog.gg8.se/>
> >
> > "Here is Evergreen City. Evergreen�¿ is the color of green
> > forever."
> >


--
/Ove

Blog: <http://blog.gg8.se/>

"Here is Evergreen City. Evergreen is the color of green forever."