[sdiy] Serge SSG @ 15V?

[Derek Holzer]

Hi Steve,

I wasn't fishing for the schemo, just an impression that it will work 
more or less as expected with the change of voltage. I'm not so much of 
an engineer that I could look at the schemo and know right away what to 
change anyways. Seems like it should be fine. Hopefully the output 
trigger won't be too far away from 5V in this situation. I guess it 
would be over rather than under anyways.

Thanks for taking the time to reply so thoroughly!!!!

Best,
Derek

On 8/6/10 1:37 AM, Steve Ridley wrote:
>
> Derek
>
>
>> I recently picked up a populated Serge SSG board on EBay, and I am in
>> the process of adding the hardware and creating a panel. The system I
>> will put this module in runs on +/-15V, while the Serge stuff runs at
>> +/-12V. I don't have access to a schematic of the SSG, so I can only
>> guess if there are any parts which would need to be tweaked to get it
>> running on that voltage level. Is there anything I should worry about in
>> there? My guess is that, since there's no V/Oct stuff going on that it
>> shouldn't matter too much.
>
>
> The main circuit is a slew limiter consisting of a 3080
> with a fet buffer feeding an LM3900. The CV to the 3080
> is processed by another 1/4 LM3900. An opamp schmitt
> trigger generates the cycle output and a 741 comparator
> produces the coupler output.
>
>
> There are a pair of pulse processors which can turn the
> slews into variable slew S&Hs. Historically, the SSG
> was used in several modules - the dual VC Slew and the
> Dual Variable rate S&H were discontinued years 30 years
> ago but the SSG combines one of each.
>
>
> The presets are just additional rate controls to set the
> operational range of the SSG. At a first glance, I can't
> see anything which will be unhappy with 15v. I have an
> old schematic for this module, but the person I got if
> from will be unhappy if it ends up posted all over the
> internet....
>
>
> Steve
>
>
>
>

-- 
::: derek holzer ::: http://macumbista.net :::
---Oblique Strategy # 138:
"Retrace your steps"