[sdiy] LED driver cable length

[Dave Kendall]

On Sep 12, 2011, at 14:07, Harry Bissell wrote:

> Sounds like a no-brainer. Choose the LED series resistor for the 
> current you want
> from 5V. Probably that will be in the 220ohm range. Thirty feet of a 
> small gauge cable (28ga)
> will only account for maybe 5 ohms or so. You're golden.
>
> Drive all the LEDs from the same transistor (parallel) with a separate 
> series resistor for each.

Thanks Harry. That's simple enough to do.

> Might want to use 1/4" jacks so you can use guitar cables for all the 
> runs. Then you will
> always have a spare (for the LED, or for the guitar...)

Plan is indeed to use 1/4" jacks. You can never have too many of them 
when out on a gig....

cheers,
Dave







>
>
> ----- Original Message -----
> From: Dave Kendall <davekendall at ntlworld.com>
> To: synth-diy DIY <synth-diy at dropmix.xs4all.nl>
> Sent: Mon, 12 Sep 2011 08:06:17 -0400 (EDT)
> Subject: [sdiy] LED driver cable length
>
> Hi Guys.
>
> Hopefully an easy one. The band I'm in uses visual clicks for count-ins
> in some numbers, so there's a plan to give the drummer and the
> guitarists a couple of boxes, each with an LED indicator responding to
> a Midi to clock converter driven from the sequencer in a synth. The
> plan is to have the unit in a 1U rack, with a couple of ordinary 1/4"
> TS jack outputs to run to the LED boxes - anode = tip, GND = sleeve.
> The cable runs would be up to 30 feet.
>
> Can anyone see any potential problems using this scheme? The drive
> voltage for the LEDs is 5V via a transistor on the board.
>
> Any thoughts welcome.
>
> cheers,
> Dave
>
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> -- 
> Harry Bissell & Nora Abdullah 4eva
>