Hello BradTheRad,
Thanks for replying and thanks for taking the time to answer my thread.
So in your resolution I see you are suggesting a 1 kHz signal to the base of a transistor driving the LED.
Well, that's not the signal I have. The only control signal I have is a 0-10VDc (@20ma max) dac output.
So I don't think your circuit configuration fits my existing circuit criteria. Let me know if we understand each other or if I am making a mistake.
Thanks
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Hello audioguru,
Thank you very much for taking the time to reply.
Yeah okay a simple transistor like a 2n2222 or a 2n3901 is fine with me but is it okay if I put the transistor in parallel with R2 (refer to LM317)?
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Hello vraj,
Thank you so much for replying.
Yes, it seems this is what others recommend. I didn't try it yet.... I will give it a shot in the close future....
Thanks
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Hello fvm and c_mitra,
Thanks guys for replying that is very appreciated.
Ok I am a little confused in the propositions.
Would you guys have a circuit schematic example that would compliment my application.
I was simply thinking to use the LM317 as the LED driver. but I think what you guys are saying is that the LM317 needs to be wired as a constant current configuration in order to control a led. If this is so at:
https://www.ti.com/lit/ds/symlink/lm317.pdf
None of the recommended circuit diagrams take into account for for the LM317 to control a Constantinni current of a LED (~1.5A) while offering a 0-10VDC (coming from a DAC)?
I'm not that good in modifying circuits to obtain the configuration that I would like.
Can you guys provide a sample circuit that would compliment the control signal that I have.
The application is to simply drive and control the luminacity of a led that draws about 1.5A from a dac output that provides 0-10Vdv.
I am willing to even add an offset and do my programming so that I make the dac's out have a one volt offset like for example 1- 10 vdc.
In case I didn't mention to everyone .... The final product is for home LED lighting .....
Thank you so much for taking the time to read this post.