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[DPRG] Using an IR LED as IR photodiode
Subject: [DPRG] Using an IR LED as IR photodiode
From: Subhobroto Sinha
subhobroto at gmail.com
Date: Tue Oct 24 11:52:27 CDT 2006
> Except for slow rise and fall time, I was pretty happy with results of LED
> sensor and a 1M feedback resistor connected to op amp last evening (running
> sensor in photoconductive mode).
Maybe slow response from the LED is because of the inherent
capacitance which can be bled off using, say a 100K resistor ?
What do you say ?
Can you send me a schematic of the design you made with part values.
A response output bundled with it will be just great !
Can you do that please ?
> I found understanding how resistor dividers work through simple application
> of Ohm's law to be very helpful before taking on understanding op amps.
> Certainly there are some very nice explanations of all of this on the
> internet...
Why ? Did I mess up somewhere ?
I will send you some ideas I have about such an application very
soon... offlist, if you don't mind
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