[sdiy] 74HC14 inverter

[harrybissell at wowway.com]

you only need the 5V source if you need to pull the
output high.  The Moog S-trigger only needs to be switched
(pulled) low.  It sees an open connection as a high (by design).

H^) harry



On Mon, 08 Sep 2008 19:10:47 +0100, dave wrote
> Hello Harry
> 
> Are you suggesting I do need a 5v source aswell ? and i connect the 
> collector to the source via a resistor and to the trigger point 
> directly ? Or just connect the  collector to the trigger point via a 
> resistor ? thanks alot for the infoup to now. dave
> 
> harrybissell at wowway.com wrote:
> > All you need to do is add a resistor from your 5V to the collector of the
> > transistor in the circuit you referenced (below) and you will get the
> > 5V to 0V that you need.
> >
> > You may or may not need the resistor. Moog had the pull-up resistor internal
> > to the synth
> >
> > S (switch) trigger goes when a switch is closed to ground.
> >
> > I'd suggest a 1K resistor if you need it.
> >
> > You are on the right track now. I didn't see enough info in your
> > original post to comment...
> >
> > H^) harry
> >
> >
> >
> >
> > On Mon, 08 Sep 2008 15:24:04 +0100, dave wrote
> >   
> >> Hello
> >>
> >> It seems that I need +5v to 0v as a trigger. Would the 74HC14 enable 
> >> me to do this ? I have also found a v-trig to s-trig converter : 
> >> http://www.synthesizers.com/moog_trigger-convert.jpg Would I be 
> >> correct in thinking this circuit would convert my 0v to +5v to +5v 
> >> to 0v ? I am hoping that I dont need a continuos +5v and then pulses 
> >> of 0v... I dont know How I wouldimplement that...Any assistance much 
> >> appreciated regards dave
> >>
> >> dave wrote:
> >>     
> >>> Hi there People
> >>>
> >>> First time mailing here so go easy on me :) . Ive got a midi to cv 
> >>> trigger pcb with +5v outputs and I need -5v or inverted pulse ( as far 
> >>> as I understand it ) I have been recommended the 74HC14 hex inverting 
> >>> schmitt trigger. Apart from powering the chip do i need anyother parts 
> >>> ( resistors capacitors etc) apart from connecting the input of the 
> >>> chip to the output of my cv trigger? Can I just use the output of the 
> >>> chip to my trigger inputs on the device I am triggering ? Any helponn 
> >>> htis would be greatly appreciated .
> >>> regards
> >>> dave
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> >>>
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> >
> >
> > Harry Bissell & Nora Abdullah 4eva
> >
> >
> >


Harry Bissell & Nora Abdullah 4eva