[sdiy] paia midi2cv8 question

[Michael Ruberto]

i'm running the LEDs with the least current possible. just need to be able 
to figure out the mode while performing in a dark place. should be easy to 
watch the blinkys while hittin some keys to determine it. sure as hell can't 
see the stupid DIP switch in the places I perform.

~M


>From: Scott Gravenhorst <music.maker at gte.net>
>Reply-To: music.maker at gte.net
>To: "Michael Ruberto" <frankentron at hotmail.com>
>Subject: Re: [sdiy] paia midi2cv8 question
>Date: Sat, 01 Sep 2001 17:55:51
>
>I should think it probably would, but I felt it
>necessary to throw out the warning in case you
>see strange blips on your CVs...  You can bypass
>at the points where the transistor drivers sit
>and that should help.  Also, the less current you
>supply to the LED the better.  Should be pretty
>cool with blinky lights.
>
>"Michael Ruberto" <frankentron at hotmail.com> wrote:
> >i use the el-cheapo 4124 trannies for this purpose in my own modules. i 
>was
> >planning to run the LEDs supply from the midi2cv8's 5 volt supply since 
>the
> >analog output section is powered from a separate +-15V. however, the 7805
> >regulator on board is supplied from the +15. shouldn't the regulator
> >compensate for most of the current switching interference and keep it
> >reasonably isolated from the analog supply?
> >
> >~M
> >>
> >>They are 2N4124 transistors.  It is rated for 200 ma.
> >>and 30 volts.  There is plenty of drive for a LED.
> >>I've not done it, but it ought to work.  The only
> >>worry might be noise injected into CVs when the LED
> >>is switched on and off.
> >>
> >>"Michael Ruberto" <frankentron at hotmail.com> wrote:
> >> >since i have no use for the open collector outputs i am thinking of 
>using
> >> >them to sink status LEDs. anyone tried this?
> >> >
> >> >
> >> >~M
> >> >
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>
>-- Scott Gravenhorst | LegoManiac / Lego Trains / RIS 1.5
>-- Linux Rex         | RedWebMail by RedStarWare
>-- FatMan: www.teklab.com/~chordman
>-- NonFatMan: members.xoom.com/_XMCM/chordman/index.html
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>


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