DATASHEET OF PHOTOTRANSISTOR 2N5777 PDF

2n phototransistor datasheet, cross reference, circuit and application notes in pdf format. 2N datasheet, 2N pdf, 2N data sheet, datasheet, data sheet, pdf, Advanced Semiconductor, SILICON NPN PHOTO DETECTOR. specifications of the substitute device to the data sheet of the original device. Industry. PILL, Lensed Phototransistor. MRD A. 2N Industry. TO

Author: Katilar Malanos
Country: Poland
Language: English (Spanish)
Genre: Travel
Published (Last): 2 April 2011
Pages: 384
PDF File Size: 14.23 Mb
ePub File Size: 10.6 Mb
ISBN: 853-6-36378-473-3
Downloads: 55585
Price: Free* [*Free Regsitration Required]
Uploader: Kazrakree

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. How can I design a circuit which utilizes a photo-transistor to make a light sensitive switch that is when there is no light in room, the led connected to the photo-transistor lights up and when there is light in room, the led connected to Phototransistor turns off? Any schematic or circuit diagram would be really helpful. Here is the link but I am using photo-transistor but dqtasheet circuit is for LDR, so how can I use photo-transistor dafasheet this circuit?

Phototransistor L14G2

Here is my Implementation on breadboard. Please tell me if this is correct. I tried to make the two lines in parallel.

I suspect my connectionof base of the transistor with resistor is wrong, dataeheet me if I am wrong. The circuit you show should work as it is, since it is already for a phototransistor. Just leave your base lead floating. EDIT – the breadboard circuit you have added looks correct though it’s hard to read.

If it doesn’t work let us know. Maybe change the resistor to 2k or larger if you are worried about blowing the LED. Just to note this circuit will work fine, although Steven’s suggestion is “preferable” in general. I would maybe not change things till you have it working. The reason the circuit is usually not the best way to do this is because it relies upon Hfe, which can vary quite widely in a transistor and is subject to temperature changes.

This means the base resistor must be chosen according to the particular transistor used. The reasons it is picked for this circuit are as it uses 1 less resistor for size purposes, see picture below Also this circuit is designed for a 3V cell like a CR, which has a high internal resistance and generally cannot supply enough current to damage the LED so it’s like having a series resistor in place The original project page explains all this.

  ANEVRIZMA NEDIR PDF

So if you are intending to eventually power this circuit from something else other than a coin cell, then you should go for the common emitter circuit Steven describes. The site you got the above circuit from also has an example of such a circuit:. To help with the breadboard I just threw together the little circuit shown in your question. I only had an IR phototransistor but it doesn’t matter much for this, it still works the same.

Anyway here are a couple of pictures of it working, hopefully you can see how the connections go:. The phototransistor base is floating, and I swapped the 1k for a 22k in my circuit to bias it correctly I arrived at this value roughly, see below and used a BC npn.

Since the BC has lots of gain the 22k works well for the base current.

It actually works very well, off in normal light and starts turning on as soon as I start dimming the lights. You may have to try a few different values of resistor in your circuit to arrive at your desired setting. First move the LED to the phototrnasistor collector, and add a series resistor.

You now have a common collector circuit, and the 2N’s base is at 2. You have absolutely no feedback in the circuit so that 30 mA may as well be mA, probably destroying the LED in a circuit with a higher power supply. You do need a resistor, and with the LED on the collector’s side your series resistor will limit hpototransistor current.

2N Datasheet pdf – SILICON NPN PHOTO DETECTOR – Advanced Semiconductor

If phototransistor Q2 does not draw current, then Q1’s base gets current through R2. The base is at 0. Transistor Q1 will want to increase that fold to get mA collector current. R1 will limit that. Now if Q2 the phototransistor gets light it will also draw current, and draw it away from Q1.

The more light, the more Q2 current, and the less Q1 base current. So that the LED will go dimmer with more ambient light. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Home Questions Tags Users Unanswered.

2N 데이터시트(PDF) – Advanced Semiconductor

Light sensor using Photo Transistor Ask Question. Umer Farooq 2 4 What did you already try and how didn’t it work? What resources have you read vedor app notes, etc.

  EFAH08W MANUAL PDF

UmerFarooq, Phototransistors normally have 2 legs, Emitter and collector. Carriers are not injected through the 25777 connection but instead from the light shining there.

Is it possible that your phototransistor gives you a base connection to allow you to bias the transistor and then use the light to increase on top of a DC large signal Bias? I dstasheet used Phototransistors before with only 2 pins multiple times. You can leave the base floating unconnected or connect it to ground through a resistor.

The site you got the above circuit from also has an example of such a circuit: Anyway here are a couple of pictures of it working, hopefully you can see how the connections go: With the lights turned down a bit: Sir an error occured, The led lights up even when light is on. What do I do? Try a higher value, around 10k and see if that makes a difference, if it’s still on when it’s light then increase photorransistor. You might have to experiment with the values a bit to get your required sensitivity, as mentioned above.

Steven – In general yes, but we’ll have to agree to disagree on this one I think: Part of the learning dstasheet be finding out for himself why this circuit would be not ideal in most situations, and then trying it datazheet ways.

In any case he has plenty of info 2nn5777 both versions now: Sorry Stevenvh never mind. Can you please show a picture or something, I am a newbie and can’t really understand your explaination.

Umer – I added a schematic and edited the text. If you don’t understand it right away, read it a second time, and try to imagine the current flows.

If yo still don’t understand you can ask again, datasheey then I expect that your question is specific about one part of the schematic. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Phototransisror as a guest Name. Email Required, but never shown. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.