Yeah, it's implied that Gnd and 0V are identical. (Well, there are
sometimes intricacies in terms of how various ground points should be
connected, but in this case you should just connect them.)
However, it's not likely that the magic smoke was caused by that. Not
conencting ground in this circuit would just make it not work, as far
as I can tell.
sometimes intricacies in terms of how various ground points should be
connected, but in this case you should just connect them.)
However, it's not likely that the magic smoke was caused by that. Not
conencting ground in this circuit would just make it not work, as far
as I can tell.
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."
