Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
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
- - - Updated - - -
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...
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.