LED resistors (was - unknown)
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Posts: 46,084
Have a look at http://www.al-williams.com/wd5gnr/basiccir.htm
That should clear it up.
Al Williams
AWC
* Easy RS-232 Prototyping
http://www.al-williams.com/awce/rs1.htm
>
Original Message
> From: jay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Axdppf0zf0N1hhb31oWfET95hAq_t60X7tiJS6laeTWn9pPUzaDYLH9Ry0jbTFshBGey]ygg@g...[/url
> Sent: Tuesday, February 19, 2002 9:21 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] (unknown)
>
>
> Hi All,
> I would like to be able to figure out what kind of a
> resister I need to get
> the voltage and mA that I want. I am doing the first project
> where I am
> going to flash the LED. I have read about it and I pretty
> much know what I
> need and what size resistor now but I don't understand how I
> would be able to
> figure that out mathmaticly. I would like to be able to get
> a componant and
> read the amount of voltage and mA that it would need and then
> figure out what
> size resistors I would need to supply that. Is there a math
> formula for that
> and if so what is it?
> Thanks
> Jim
>
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>
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>
That should clear it up.
Al Williams
AWC
* Easy RS-232 Prototyping
http://www.al-williams.com/awce/rs1.htm
>
Original Message
> From: jay [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Axdppf0zf0N1hhb31oWfET95hAq_t60X7tiJS6laeTWn9pPUzaDYLH9Ry0jbTFshBGey]ygg@g...[/url
> Sent: Tuesday, February 19, 2002 9:21 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] (unknown)
>
>
> Hi All,
> I would like to be able to figure out what kind of a
> resister I need to get
> the voltage and mA that I want. I am doing the first project
> where I am
> going to flash the LED. I have read about it and I pretty
> much know what I
> need and what size resistor now but I don't understand how I
> would be able to
> figure that out mathmaticly. I would like to be able to get
> a componant and
> read the amount of voltage and mA that it would need and then
> figure out what
> size resistors I would need to supply that. Is there a math
> formula for that
> and if so what is it?
> Thanks
> Jim
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the
> Subject and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
>