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Thanks again for the reply.
I want to measure the skin reflection to detect melanin. I am using IR light and PD. I am not driving the LED using any frequency just on and off with constant current driver circuit enabled from pin 13 (PFA-pg.txt).
1. powering using 3.7 V rechargeable battery and...
Thank you for the reply. Based on inputs i have made 2 different circuit one with msp602 (as buffer amplifier) another with opa380 with 5V bias input as said both IC's i have now in my hand. Tell me which one shall i go with.
You are correct the 12 bit ADC is not precise so i have added ads1115...
Thank you for the reply, I have added the second one to my circuit. for 2.8 volt i used LDO regulator.
OPA380 i bought it :confused:
are my circuit correct? (shall is use MCP602 as opamp)does it needs improvement? i have also attached easyeda files
I am going to use FGA21 InGaAs photodiode from thorlabs. I want to know which one of the circuit is better for me (PFA). my application is not for high speed application but i need low noise, linear and precise application.
I saw some tutorial photovoltaic mode is best but from the spec sheet...
can any one give me a circuit for tungsten halogen bulb driver, i am planning to use replacement bulb this from oceanoptics it cost around $200 but the complete package is around $1000.
I have 12 V adapter, fan and components, I need constant light intensity from the light source
Hi,
I am using a costly photodetector FGA21 , it requires 3 volt reverse bias (absolute maximum).I am powering the device using smartphone (5V). I have 3.3 volt regulator which is exceeding the voltage rating shall i use voltage divider (10k&100k)? or shall i use voltage reference IC (2.8) 2.5v...
i am using 1200 nm LED driving using constant current circuit, i have not modulated the led, I want to measure voltage change when light traveling from diffused reflectance optical fiber from fat sample.
I want a APD circuit, like bias voltage, opamp resistor values etc, kindly help.
Does it...
https://www.passion-radio.com/wifi/esp32-lilygo-895.html
Hi, i am using the above said TTGO esp32 board with display,
If i connect the board via USB type C cable the display is ON, but if i give regulated 5 volt power supply the display is in off state. I have to press the push button which...
Thank you as per your suggestion i have made a circuit PFA, used an opamp as buffer circuit and LM358 as input reference. Do i need filter(I don't have any idea)? or is this configuration is enough.
Planning to varying the LED intensity using potentiometer and simultaneously measuring the LED...
Thank you for the reply.
I want to measure the resolution of this photodiode op560c when it connected to the 16 bit ADC (NI-DAQ), if I connected in 10k series resistance with the photodarlington and measure the voltage reading across it when I shine 0.03 mW green light (530 nm).
Is it the...
Thorlabs photodiode s150c. They have mentioned a resolution of 10 pW. how do they calculated it?.
I want to know the resolution of this photodiode op560c op560c.
kindly help
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if i connected in 10k series resistance with phe photodarlington and measure the voltage reading...
my expected output voltage is 0 to 4 volts. my reference PD output voltage will always be 3.8 to 4.1 volt, and test PD is swing between 0.9 to 3.1 volt. I am using photo darlington(PD) op560c, LED is irl81a.
Can I use this circuit given in this website? light from my reference and test fiber...
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