I recently took up a rather ambitious project for my skill level as I have never worked with almost all involved components before.
I would be very grateful if you could help me find the best components to hopefully make this work.
What I am trying to achieve is this:
A laser beam is shining at...
I am building a setup to be able to read the reflected light from a laser beam with a photodiode, which I have never done before.
so I bought this photodiode and this transimpendance amplifier. But after wiring it up, I didnt get any useful readings from the TIA.
So I I reduced the voltage from...
Hi,
I've designed pulse oximeter circuit. When one LED lights continuously, I got perfect PPG (Photoplethysmogram) signal.
Then I measure PPG while blinking LEDS, like that:
I got stuck. There is no signal or just noise. When I removed low pass filters, I easily got my opamp saturated. I...
Hi Guys
I am working on a private project where I need to detect a blue light flashing up. But the OpAmp I am using is always on HIGH regardless of the brightness of the blue light. I have also tried various OpAmp circuits but they all resulted in the same. I've tried feedback resistors of up...
Hello there,
I want to know where I can find a SPICE model for this phtodiode regular InGaAs photodiode IG17 here is datasheet https://www.lasercomponents.com/de/?embedded=1&file=fileadmin/user_upload/home/Datasheets/lc-ingaas/ig17-series.pdf&no_cache=1 .
Thank you for understanding,
Dragos.
i have a 1981 Misubishi linear tracking turntable with photodiodes with code SP254FS. One is damaged and i am trying to source a modern equivalent. Any help would be greatly appreciated.
Thanks
Shaun
I am trying to build transconductance amplifier circuit to obtain values of the reverse biased photodiode (PD) current in order to estimate some of the LED characteristics.
At first, I have used the scheme named “Recommended Zero Biased Circuit” from page **broken link removed** (placed at the...
The photodetector is to be used to detect green light from an optical fiber (emitted by fluorecein, about 500nm). I have tried using this detector, but with no readings. This diode has a response of about 0.25 A/W at 500nm.
This is the amplifier I have used (OPA27GP):
Is there a better...