Part Number: TL082
This is for sensing sunlight for a product in an agriculture environment. I have the transimpedance circuit already for converting the output of a photo diode to a voltage. The photo diode is looking at the sun from a greenhouse. I want to integrate that essentially DC signal over time. For the max voltage into the integrator (say 5 v) if that max voltage is present all the time I want the integrator to reach its max voltage after 5 minutes. I will short the integrator capacitor through a resistor after the integrator reaches its max output voltage to return it to zero. I am using 4.7 meg as the input resistor (R1) and also as the feedback resistor (Rf) and between 94 and 100 uf for the feedback capacitor (Cf). I believe this should give about 5 minutes of time (tau=0.69CfR1). I would use a TL082 (cheap; low offset V; etc) if it was single supply. I guess I could use EAGLE CAD to supply a circuit if needed. Looking for the right circuit and device (op amp) for this.
Alvin P. Schmitt
P.O. Box 201
Newport VA 24128-0201
Regards,Ronald MichallickLinear Applications
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In reply to Ron Michallick:
In reply to Alvin P. Schmitt:
In reply to kai klaas69:
Like Kai said, we are waiting for more details especially VCC voltage so this design only needs to be completed one time.
Max input is 5V (fastest output ramp) , what is minimum input (no output ramp)?
In the 1970's I was repairing televisions with tubes.
Anyway, I used your text to draw this. It seems incomplete.
second transistor drain is vcc. first transistor drain is output. top of resistor divider is vcc other side of r1 is dc voltage input.
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