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28 Threads found on edaboard.com: Photodiode Switch
The SFH2400 is OK. I don't know why you want 10ns precision, but you won't get it with the circuit you refer to in the data sheet. Well, maybe with a 50 ohm load you might, but with RBE=10M you will more likely be something like 100us or slower. To get 10M ohm with 10ns response time will be a tall order in a single stage even with a good tran
Hi all.... i want to know which one is better : photodiode or Phototransistor ? and give me the reason? coz i want to use light senor for my project. it's better if there any some reference about it. thanks :) regards, Elits
Hi Everyone I have not being a member of edaboard for a long time so please inform me if I can place this post in a better place. I thought that this would be a good place since PIN diode are used a lot in RF applications, although this is not an RF application. MY NEED I need a good source of information (Technical or Application notes) on
You can find photodiodes with eye similar sensitivity- if it is a aspect for you... K.
im using the optocoupler to drive the switches in 2 switches foward converter. for the cathode and anode , pin 2 and pin 3 in hpcl 3120 , is it we just connect to the function generator to supply the PWM into the hpcl 3120? ---------- Post added at 12:40 ---------- Previous post was at 12:38 ---------- [QUOT
If the Tesla coil should spark by audio signal, why not use a simple VOX? This is a Voice-Operated switch, operates wirelessly, and in the audio amplifier after the microphone you can add a filter for a selected tone, so the Tesla coil will not spark at ANY sound but only one you send from your speaker. You can also use a laser pointer as trans
Hi All, I am using a photodiode SFH206K (datasheet attached with the mail). The laser light is incident on the photodiode with a frequency of 10 and 20 Hz. Can you suggest me proper value of the RC filter given in the circuit attached with the mail. I tried with R7 = 220K and C55 = 100nF but none of the lights are detected and if I neglect the f
I want to use optical fiber and LeaserDiode as detector . A laser diode isn't a detector. I would suggest you look at a fast PIN photodiode for the detector. Assuming you have lots of signal you should be able to use a simple resistive load (50 ohms or less) for the photodiode. However, you will not find i
Heya I've taken on a project that is a tad out of my league in terms of circuits... Basically its an aluminium block being heated to 63°C for 20 - 60 minutes. This block has sample tubes in them in which a reaction (LAMP - type of Isothermic PCR) takes place producing flurecence if a gene is present, and I hope to measure this using an amp'd ph
Use a commercial passive IR detector (as used in burglar alrm systems) or Use an IR photodiode as a detector(plus the necessary amplifier). Place a Fresnell lens in front of the photo diode. The humabn body will be a source of IR signal. Use a high pass filter to detect the target movement (The Fresnell lens will "amplify"target movement.
A problem about an integrator simulation; when i simulate an integrator ,a warning is followed that missing bulk source(a reset MOS switch ) would be forwardly biased. i do not know why? integrator state: 1.a photodiode is connected to negative input terminal of operational amplifer. 2. a 2.5v referrence voltage is connected to positiv
Hi I need suggection for the circuit with following requirements : - Circuit should withstand against dark current fluctuations from photodiode and maintain its output . - low OFF current (no more 5 uA) - low voltage (2 - 4 V) - switch ON slew rate max 3 usec - switch OFF slew rate amx 10 usec - Temperature range -30 - 75 C - (...)
Your photodiode is in wronge direction, you must reverse the diode direction.
Thank you for your help. "current mode" means the input for my optical receiver is in current format, for example 10uA as the output nature of the photodiode. i just learned that PRBS can be generated from a matlab using some scripts, or digital circuits as described above. I will try to import the PRBS to Cadence, hopefully I can find a
Why don't you use a photodiode instead.It's worth a try .Anyway your project is fabulous and very exciting
I am not sure if the threshold is required; if necessary it will be 3.5V. Can somebody please help me out? I need an example program to try these things. I've tried searching online, but I can not find any of them during this particular PIC. I'm in a desperate position because I've tried to do this for several weeks, but I still can not do and b
The transmitter flashes the LED very rapidly. This is to increase it's brightness by driving it at high(ish) current but for short periods so it doesn't overheat. The receiver picks up the flashes in the photodiode as a tiny voltage change and amplifies it so the signal is bigger in the 741 op-amp. The amplified signal is then converted to DC in
hi, could anyone help me how to make a motion sensor circuit using BJT and photodiode. i dont know much about this so i want the most simple circuit, using few devices, if possible.. thanks.
Hello, I think the MOSFET of the image sensor should be worked in the switch mode. but the picture is that the source is connectted to the photodiode, is this the suorce
I am quantifying the characteristics and performance of a device that includes a photodiode. Currently my set up involves the photocurrent generated by a photodiode going into a pre-amplifier and then additional signal processing elements. My new experiment involves the use of low current ammeter. The meter is different from a normal ammeter
Hi I like to design a laser driver that can regulate the current based on the photodiode inside its package. Basically a constant output laser diode. I also need to modulate the output of the laser at 1MHz using pulses. Any pointers or reference schematics I can use?
To check for correct operation of your driver circuit, you would preferably measure signals from the driver itself as a fisrt step, e.g. voltage across R7. A weakness of your darlington driver is the lack of a base-emitter resistor for Q2. A sufficient low ohmic resistor (e.g. 100 ohm) helps to switch of Q2 fast. The square wave frequency can't
Are you sure you need such a high transimpedance? You have a potential divider in the feedback implying a current of maybe 10nA. In principle you can multiplex photodiodes but leakage will kill the idea if your currents really are that low, in which case you need 3 transimpedance amplifiers as has already been suggested. Keith
I am trying to measure the long tail of a transient current decay of a photodiode which is excited by a pulsed laser. The transient from the photodiode is fed into a current amplifier and the amplified current is measured by an oscilloscope with 50ohm input impedance. See the circuit here 79565 My goal is to amplify the long tai
Sir let me help here for a very simple but importatnt designing i ve a versatile use of my computer system (its a big chapter no need to discuss that) for which i need the operation of keyboard on a separate pads like structure as i ve to hit all the time which may damage my keyboard after sometime :( but too that hardware cant be design
switch noise: all switch noise and photodiode noise.
hmm sir i designed exactly what i uploaded the picture & using a micro switch for the purpose , i dont want 2 switched , so i made it , but wen i conneced a photodiode it simply switches it on but not able to switch it off or happen vice-verca depending on previous sate Since you mention a (...)
Barry is right. Any sort of schematic, even hand drawn and scanned to make .png or jpg would help lots. The logic part, which pair signals first, counted while both are signalled together, is easy enough. Your difficulty is getting reliable signal conditioning from the LED/photodiode pairs to deliver the change as a logic signal. Without knowi