limiting current on LED''s (slightly off topic)
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I assume you want to use one resistor to source or sink current on multiple
LED's, then use a Stamp pin for each LED to turn it on / off.
Yes -- the brightness of the remaining LED's will change when other LED's
are turned on / off.
Resistors are cheap -- I'm still working on an assortment of 1/8 watt
resistors I bought from Jameco 4 years ago for $10 or less. If its a space
thing, go with a SIP -- multiple resistors in one pack.
Original Message
> This is something that I've been wondering about for a while now and
> was hoping one of you might know. Every circuit I see using LEDs
> uses a seperate current limiting resister for each. Yet, on the
> stuff I build, to cut down on parts I'm usually tempted to tie two
> or three LEDs to one resistor.
>
> Does anyone know of any drawback to doing this?
LED's, then use a Stamp pin for each LED to turn it on / off.
Yes -- the brightness of the remaining LED's will change when other LED's
are turned on / off.
Resistors are cheap -- I'm still working on an assortment of 1/8 watt
resistors I bought from Jameco 4 years ago for $10 or less. If its a space
thing, go with a SIP -- multiple resistors in one pack.
Original Message
> This is something that I've been wondering about for a while now and
> was hoping one of you might know. Every circuit I see using LEDs
> uses a seperate current limiting resister for each. Yet, on the
> stuff I build, to cut down on parts I'm usually tempted to tie two
> or three LEDs to one resistor.
>
> Does anyone know of any drawback to doing this?