May 20, 2019 posted by

“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.

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But John Miller provides a link in his post – dating back to – for a. In older texts pbw40 electrical engineers often used uuF for picofarads; ie pF. Ok, so mA is too much current for those things.

Shutter Speed Tester – DIY Build – Electronics Parts

You’re unlikely to get the phototransistor to draw more than a few mA even if you place to right next to the emitter. So let’s say i want 25mA is that good? Guaranteed safe-area operation, but you have to get the wires right.

You might want to get a digikey catalog that has a zillion parts in it. If it’s NTSC it shoots even faster, at I mounted the sensor in a piece of opaque plastic panel, cut to 60 by 35mm in size. The value of R should not be decreased significantly, since that could lead to the phototransistor being effectively short circuited – if in doubt, choose a higher value for R.

A great opportunity for “experientation”. And do the value R2 and R3 stay the same as in the first schematic? So what do i need? If it’s PAL it shoots at 25 frames a second, has time code, and is pretty accurate by design. A single phototransitor should be cheap, so you won’t be out much if it doesn’t work. The phototransistor has to be shielded from light other than the beam that shines through the shutter, otherwise it will simply keep the circuit permanently on don’t leave the battery in circuit when not in use – do the tests in subdued lighting.


BPW40 Datasheet PDF – ETC1

Sorry for not attaching a reference. Chris, You may well be right – I would never claim to know much about the engineering in a lens shutter – the information Npw40 quoted came from a camera repair guy who calibrated the shutter on an old Schneider S. From a websearch, BPW is a part number for a particular phototransitor. The other consideration is the amount of charge stored by the capacitor, and any leakage through the recording circuit. The spec sheet suggests you just want to obey voltage and current limits which are pretty liberal.

Does anyone – more fluent in electronic components – know where I can buy the following Adding a second battery to increase the datasjeet may help.

Anyway, if you are operating the LED under these conditions you will need to a resistor to ensure the current isn’t too high. I suggest checking the yellow pages or the datasheeet for a store near you that actually sells electronic components. Note this is super simplified to a first approximation only but it will do to work with. I built a homemade shuttertester some time ago. The TV lines method I linked to may give some indication of the changing effective aperture.


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. 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.

BPW40 Datasheet PDF – Telefunken

You’re going about the choice of resistor datashwet the phototransistor the wrong way. It then gave the current through the device. The main problem is getting the risetime of the sensor down, and in the end I chose a readymade light-sensitve switch IC, rather than use discrete components, because it had a faster reaction time.

If the color response is different, you might have to use a different light source. A laser pointer is just too fiddly to set up. That calculation looks good.

Why people publish such daft and needlessly precise values, I don’t know. No that quote said assuming little or gpw40 Vce when the detector was saturated, that is turned on by exposure to light.

Also i don’t see a voltage drop, is that because it depends on the amount of light it is receiving?

Since datasheett is the 5RC value that is important, any values of R and C that produce 5RC in the range of say microseconds should work.