Wiardgroup

--- the doc rules


drmabuce <drmabuce@yahoo.com> wrote:

> 
> Hi Andrew
>     (of the PSIM list fame) doc here...
>     As far as i can see, the 1200 series modules
> were designed very
> 'close to the bone' everything is designed to make
> ultra-efficient use
> of the components. and keep production cost & labor
> down to a minimum
> So i think the chances that Grant will add features
> on production
> boards or mod them significantly are slim to none.
>     but (acknowledging the tedium of my devotion to
> DIY) if you are
> handy with a soldering iron there are some
> opportunities on the
> surface mount PCB though... 
>     for an external clock input, you could interrupt
> the trace from
> pin 7 of the TL074 (there's only one Tl074 on the
> board)and inject any
> 15-volt pulse signal into the NON-pin7 side of the
> cut. This exploits
> the diode and 1/3 voltage-divider that Grant put on
> the board but a
> better solution would be to build your own
> comparator and buffer with
> a 15-volt output and inject it. That way you could
> control the
> threshold for the trigger point of your incoming
> pulses or even sync 
> directly to an external LFO.
>      As for somehow re-fitting the internal clock
> controls as some
> kind of divider. I think that would be impractically
> laborious &
> costly if not nigh on impossible. But adding Any
> common CMOS single
> divider chip (ie 4022 or 4017) in front of the
> aforementioned
> interrupt would do the trick. John Blacet sells a
> dandy Binary divider
> that could be used externally too.
> 
>      If you're skittish about hacking a
> surface-mount PCB i think any
> average electronic tech could get a couple of wires
> soldered in there
>  without the cost being too exorbitant.
> 
> cheerio,
> -doc
>       


		
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