“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any. BPW40 | Phototransistor; λp maxnm; 32V; 20°; Lens: transparent – This product is available in Transfer Multisort Elektronik. Check out our wide range of . Part, BPW Category. Description, Silicon NPN Epitaxial Phototransistor. Company, ETC. Datasheet, Download BPW40 datasheet. Quote. Find where to buy.
|Published (Last):||10 December 2015|
|PDF File Size:||8.22 Mb|
|ePub File Size:||15.68 Mb|
|Price:||Free* [*Free Regsitration Required]|
About the detector, the wpb40 that one is next. You can see the light sensitive area easily. Have a Happy New Year all I previously used a datasheey simple and reasonably accurate method of testing shutters in large format lenses for practical purposes, by filming the shutter opening and closing using a basic mini-dv camcorder.
Here’s a link to the items in the online catalogue: Adding datasheet second battery to increase the voltage may help. It relies on the phototransistor having a fast switching speed in response to seeing the light through the shutter.
I picked up 2 or 3 datssheet years ago for playing around with but can’t tell you much about them except they’re easy to wire up to demonstrate they’re sensitive to light.
For use, remove the lens es from the camera or shutter to be tested, and just use a domestic filament bulb, or even a small torch as the light source. I built a homemade shuttertester some time ago. That calculation looks good.
Chris, You may well be right – I would never claim to know much about the engineering in a lens shutter – the information I quoted came from a camera repair guy who calibrated the shutter on an old Schneider S. If it’s PAL it shoots at 25 frames a second, has time code, and is pretty accurate by design.
BPW40 Datasheet, PDF – Alldatasheet
Guaranteed safe-area operation, but you have to get the wires right. You can test that the circuit works by operating in reverse – hook it up, with the phototransistor exposed to light, then cover the phototransistor and uncover bbpw40 again.
I’m guessing you’ve got a meter of some sort I think Radio Shack still sells those and know Ohm’s Law; both are likely to come in handy. Happy New Year to everyone on this group.
The OP in that other thread I linked to ended up using K, because he needed enough sensitivity to detect the emitter when it was 10 inches away from the phototransistor. They’re used for a bunch of things, but mainly to isolate two parts of a circuit electrically, using light as a one-way bridge across what would otherwise be a non-conductive air space.
From a websearch, BPW is a part number for a particular phototransitor. This time determines the width datsheet the blip seen in the trace recorded on the PC. You will probably have an easier time finding either 3. A guess is that you can probably vary the values by a few tens of percent from the exact values you have listed — configuring a phototransitor isn’t a critical application.
I bought all the crap put one together didn’t work fussed with it. Also after i got 1 working the next step will be to get 2 working since i want to detect speed of falling objects. The value of R should not be decreased significantly, since that bwp40 lead to the phototransistor being effectively short circuited – if in doubt, choose a higher value for R.
Better electronic part stores usually have books that suggest substitions, so if they don’t have the exact part you can try their suggested substition from what they stock. A laser pointer is just too fiddly to set up. Is this reasoning correct?
Thanks for all the responses so far. I will look at the link you give me after i posted this. Maybe at faster speeds a different spring is active.
BPW40 Datasheet PDF –
Formal verification of safety-critical software, software development, and electronic design and prototyping. I had a wide selection of many small components right in the same room with me. A great opportunity for “experientation”. You’re unlikely to get the phototransistor to draw more than a few mA even if you place to right next to the emitter.
He was initially using the internal pullup resistor in the Arduino which has a value of around 20K to substitute for R2. Use or pF, it doesn’t have to be too accurate for this application. Nevertheless my tests suported the repair guy’s assertion. As you can see in the quicky picture below, they have a flatter top than the BPW The spec sheet suggests you just want to obey voltage and current limits which are pretty liberal.
Atm i’m thinking when powered up on 5V that the max forward voltage is 5V depending on the light. You’ll probably have difficulty sourcing a pF capacitor too. The former is assured by the power source you use, whereas the latter is typically done with a resistor.
However, recording circuits are designed to handle a wide range of sound intensities, so values of R that are up to 10 times higher with values of C that are up to ten times smaller will probably also work, although the height of the blips in the trace would be less.
The TV lines method I linked to may give some indication of the changing effective aperture. You might want to get a digikey catalog that has a zillion parts in it. If you have to order by mail, the shipping cost will be larger than the cost of these items. So let’s say i want 25mA is that good? And about the emitter and the collector, by the image there is a small square with a capital A in it, i first thought it was a indication for Anode, is that wrong?
Share This Page Tweet. I mounted the sensor in a piece of opaque plastic panel, cut to 60 by 35mm in size. But this is only a guess since you haven’t referenced the circuit diagram.
The original thread http: The test circuit they show there in the spec sheet is very similar to one I’ve used before with opto-isolators, which are common components that have a little LED shining onto a phototransistor, all inside a sealed case. The sensor output goes to the pulse counter through cheap screened figure-of-eight audio cable.
Let’s say i want 25mA.