Mark,
I like chips too. There is room for a op-amp. I'll bread borad up a
comparator and see what happens. My dvm does not have s/h for the
voltages, too bad. lm358 sound good - i might even have some.
I'm on vacation so it will be a few days til I am back at thge bench.
thanks Jason and Mark.
PS - Jason - I am in Oakaland Ca , I think you might be also.
let me now
Jeff
I like chips too. There is room for a op-amp. I'll bread borad up a
comparator and see what happens. My dvm does not have s/h for the
voltages, too bad. lm358 sound good - i might even have some.
I'm on vacation so it will be a few days til I am back at thge bench.
thanks Jason and Mark.
PS - Jason - I am in Oakaland Ca , I think you might be also.
let me now
Jeff
--- In cgs_synth@yahoogroups.com, Mark <yahoogroups@...> wrote:
>
> On 7/3/08, Jeff Foster put forth:
> >I found the triggers via an LED with 2k res. to ground. pooked the
> >positive leg on the pcb traces until it lite or flashed. The
> >brightness was pretty good.
>
> That leads me to believe that it is more than 5V, but I would
> double-check your resistor value.
>
> Do you have a DMM?? Most have sample and hold.
>
> >When the led was on the triggers for the
> >hi hat, the sound of the hi hat changed, closed hh and conga were
> >not affected. I think they are positive pulses? An OR gate would be
> >right.
>
> If it's effecting the sound, then I would guess that it drawing too
> much current. Although I would guess 2K would be a high enough
> impedance. Perhaps you should poke around a bit more.
>
> >maybe a simple PNP tranisotr? next is to get the pulses up to at
> >least +5v, right?
>
> I'm not much of a discrete transistor guy, but I think an emitter
> follower would use an NPN?? Anyway, if a 2K LED resistor was
drawing
> too much current, you might have trouble saturating the base. Imho,
> bipolar transistors are rather low impedance devices that burn out
> almost instantly with too much current, making them a PITA,
> especially when dealing with unknown values. Otoh, if you have the
> room, a single-sided op-amp like an LM358 is pretty bullet-proof.
>
> On 7/2/08, Jason Proctor put forth:
> >you could perhaps use the gate converter module. 4 comparators on a
> >little PCB. tweak the comparison point down a bit perchance.
> >
> >http://cgs.synth.net/modules/cgs56_gatecon.html
> >
>
> He mentioned he wanted single-sided (although I guess he could use a
> different amp).
>