[sdiy] 74HC14 inverter

[dave]

Thanks for all the help guys!
I have one trigger using the circuit here 
:http://www.synthesizers.com/moog_trigger-convert.jpg  And I now think I 
have my head around what I need to do with the 74HC14 for the rest. Just 
a shame my midi cv isnt velocity sensetive....
dave

HL-SDK Synths wrote:
> If you have 0 as low, and 5 as trigger, throw it at this: 
> http://courseware.ee.calpoly.edu/~dbraun/courses/ee307/F03/2/01_02_ArchanaDatla,MichaelCasanova.html 
> <http://courseware.ee.calpoly.edu/%7Edbraun/courses/ee307/F03/2/01_02_ArchanaDatla,MichaelCasanova.html>
>  
> And when you apply 0 volts, you get 5 volts at the collector, and if 
> you apply 5 volts, you get 0 volts at the collector. Or close to.
>  
> I'd use 1k ohm for Rb and 610ohm for Rc, 5v for vcc, and you take your 
> trigger at vout. Also, "source" is also the name of a pin on FETs. 
> Just to add to confusion.
>  
> As for connevting to vout, you don't need a resistor there. The output 
> is limited from short circuiting by Rc, but I'm definitely not an expert.
>
> On Mon, Sep 8, 2008 at 2:10 PM, dave <synthlocus at googlemail.com 
> <mailto:synthlocus at googlemail.com>> 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 <mailto: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
>                 _______________________________________________
>                 Synth-diy mailing list
>                 Synth-diy at dropmix.xs4all.nl
>                 <mailto:Synth-diy at dropmix.xs4all.nl>
>                 http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>                      
>
>             _______________________________________________
>             Synth-diy mailing list
>             Synth-diy at dropmix.xs4all.nl
>             <mailto:Synth-diy at dropmix.xs4all.nl>
>             http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>                
>
>
>
>         Harry Bissell & Nora Abdullah 4eva
>
>
>          
>
>     _______________________________________________
>     Synth-diy mailing list
>     Synth-diy at dropmix.xs4all.nl <mailto:Synth-diy at dropmix.xs4all.nl>
>     http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>
>