Cgs synth

>I'm currently designing a PCB based on CGS114 to suit my own needs. In
>doing so, I've been studying both the schematic and PCB layout and
>I've noticed a small difference between the two. In the schematic,
>there's a diode that goes from the 33k resistor near trig in, directly
>to end out. In the PCB layout, this diode is instead connected to the
>output of the 3900, on the other side of the resistor/zener network.
>
>Another DUSG schematic I have also connects it as in the PCB layout,
>so I'm assuming this is the original way. Is there any particular
>point in connecting the diode as in the schematic? (I.e. directly to
>the M terminal.)
>
>I'm trying to understand whether the purpose of this diode is to
>forward pulses from trig in to end out, or to sink current from the
>trig input depending on what the signal input network does with end
>out...
>
>Convenient link:
>http://www.cgs.synth.net/modules/cgs114_dusg.html
>
>--
>/Ove
>
>Blog: <http://blog.gg8.se/>
>
>"Here is Evergreen City. Evergreen is the color of green forever."
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>

On 30 December 2011 09:40, <sasami@...> wrote:

> **
>
>
> If the PCB agrees with the other diagram, that means my diagram is
> incorrect.
> As simple as that.
> Ken
>
> >I'm currently designing a PCB based on CGS114 to suit my own needs. In
> >doing so, I've been studying both the schematic and PCB layout and
> >I've noticed a small difference between the two. In the schematic,
> >there's a diode that goes from the 33k resistor near trig in, directly
> >to end out. In the PCB layout, this diode is instead connected to the
> >output of the 3900, on the other side of the resistor/zener network.
> >
> >Another DUSG schematic I have also connects it as in the PCB layout,
> >so I'm assuming this is the original way. Is there any particular
> >point in connecting the diode as in the schematic? (I.e. directly to
> >the M terminal.)
> >
> >I'm trying to understand whether the purpose of this diode is to
> >forward pulses from trig in to end out, or to sink current from the
> >trig input depending on what the signal input network does with end
> >out...
> >
> >Convenient link:
> >http://www.cgs.synth.net/modules/cgs114_dusg.html
> >
> >--
> >/Ove
> >
> >Blog: <http://blog.gg8.se/>
> >
> >"Here is Evergreen City. Evergreen is the color of green forever."
> >
> >
> >------------------------------------
> >
> >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/>
>
>
>



--
/Ove

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

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


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

>Upon further inspection, I believe the source of this connection is CGS75,
>where it simplifies the connection of the cycle switch, while probably not
>affecting the normal function of the module. There, this diode (*2) is
>connected after the resistors, and the PCB layout agrees.
>
>On 30 December 2011 09:40, <sasami@...> wrote:
>
>> **
>>
>>
>> If the PCB agrees with the other diagram, that means my diagram is
>> incorrect.
>> As simple as that.
>> Ken
>>
>> >I'm currently designing a PCB based on CGS114 to suit my own needs. In
>> >doing so, I've been studying both the schematic and PCB layout and
>> >I've noticed a small difference between the two. In the schematic,
>> >there's a diode that goes from the 33k resistor near trig in, directly
>> >to end out. In the PCB layout, this diode is instead connected to the
>> >output of the 3900, on the other side of the resistor/zener network.
>> >
>> >Another DUSG schematic I have also connects it as in the PCB layout,
>> >so I'm assuming this is the original way. Is there any particular
>> >point in connecting the diode as in the schematic? (I.e. directly to
>> >the M terminal.)
>> >
>> >I'm trying to understand whether the purpose of this diode is to
>> >forward pulses from trig in to end out, or to sink current from the
>> >trig input depending on what the signal input network does with end
>> >out...
>> >
>> >Convenient link:
>> >http://www.cgs.synth.net/modules/cgs114_dusg.html
>> >
>> >--
>> >/Ove
>> >
>> >Blog: <http://blog.gg8.se/>
>> >
>> >"Here is Evergreen City. Evergreen is the color of green forever."
>> >
>> >
>> >------------------------------------
>> >
>> >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/>
>>
>>
>>
>
>
>
>--
>/Ove
>
>Blog: <http://blog.gg8.se/>
>
>"Here is Evergreen City. Evergreen is the color of green forever."
>
>
>[Non-text portions of this message have been removed]
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>
>