[sdiy] LED driver cable length

[Harry Bissell]

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.

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...)

H^) harry


----- 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