Cgs synth

>hi folks,
>
>general interfacing question.
>
>I would like to drive my sample and hold
>modules from my casio mt-68. The casio has analogs drums and I have
>found on the pcb the clock signals for the open and closed hi-hat.
>I figure this will give me 16th notes which can be
>divided down for other division if needed. although not all patterns
>use HH. might add in the conga hit as well.
>
>I image some type of buffer circuit is required to interface the
>clock with the trigger in on the s/h?
>Would the "Dev-mod Gate/Trigger block" of Ken's work(CGS69)? would
>also like to run it off of single supply (casio is 7.5 or 9v).
>Maybe simple transistor buffer is all that is needed? I was thinking
>a transistor "AND" gate and tie one side high and then feed the
>casio triggers to the other side. would that be enough to get a
>clean triggers with out loading down the casio logic ?
>looking for simple, single supply soultion.
>suggestions?

--- In cgs_synth@yahoogroups.com, Mark <yahoogroups@...> wrote:
>
>
> Imho, the first step would be to figure out what sort of signal you
> have. Is it a positive voltage, negative voltage, or a collector??
> What is producing it or what is it driving?? From that you can get
> an idea how much current it can sink or source. Then that will
tell
> you what sort of buffer you might need.
>
> As far as being able to find a trigger that occurs on every 16th,
you
> can OR them together (using diodes or logic).
>
> On 7/2/08, Jeff Foster put forth:
> >hi folks,
> >
> >general interfacing question.
> >
> >I would like to drive my sample and hold
> >modules from my casio mt-68. The casio has analogs drums and I
have
> >found on the pcb the clock signals for the open and closed hi-
hat.
> >I figure this will give me 16th notes which can be
> >divided down for other division if needed. although not all
patterns
> >use HH. might add in the conga hit as well.
> >
> >I image some type of buffer circuit is required to interface the
> >clock with the trigger in on the s/h?
> >Would the "Dev-mod Gate/Trigger block" of Ken's work(CGS69)? would
> >also like to run it off of single supply (casio is 7.5 or 9v).
> >Maybe simple transistor buffer is all that is needed? I was
thinking
> >a transistor "AND" gate and tie one side high and then feed the
> >casio triggers to the other side. would that be enough to get a
> >clean triggers with out loading down the casio logic ?
> >looking for simple, single supply soultion.
> >suggestions?
>

>thanks Mark,
>
>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. 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.
>
>maybe a simple PNP tranisotr? next is to get the pulses up to at
>least +5v, right?
>
>thanks for your suggestion!
>
>JEff
>
>
>--- In cgs_synth@yahoogroups.com, Mark <yahoogroups@...> wrote:
>>
>>
>> Imho, the first step would be to figure out what sort of signal you
>> have. Is it a positive voltage, negative voltage, or a collector??
>> What is producing it or what is it driving?? From that you can get
>> an idea how much current it can sink or source. Then that will
>tell
>> you what sort of buffer you might need.
>>
>> As far as being able to find a trigger that occurs on every 16th,
>you
>> can OR them together (using diodes or logic).
>>
>> On 7/2/08, Jeff Foster put forth:
>> >hi folks,
>> >
>> >general interfacing question.
>> >
>> >I would like to drive my sample and hold
>> >modules from my casio mt-68. The casio has analogs drums and I
>have
>> >found on the pcb the clock signals for the open and closed hi-
>hat.
>> >I figure this will give me 16th notes which can be
>> >divided down for other division if needed. although not all
>patterns
>> >use HH. might add in the conga hit as well.
>> >
>> >I image some type of buffer circuit is required to interface the
>> >clock with the trigger in on the s/h?
>> >Would the "Dev-mod Gate/Trigger block" of Ken's work(CGS69)? would
>> >also like to run it off of single supply (casio is 7.5 or 9v).
>> >Maybe simple transistor buffer is all that is needed? I was
>thinking
>> >a transistor "AND" gate and tie one side high and then feed the
>> >casio triggers to the other side. would that be enough to get a
>> >clean triggers with out loading down the casio logic ?
>> >looking for simple, single supply soultion.
>> >suggestions?
>>
>
>
>
>------------------------------------
>
>The CGS Modular Synth home page: http://www.cgs.synth.net/
>Yahoo! Groups Links
>
>
>

--- 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).
>