“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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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. The IR irradiance has the effect of base current. So we need to choose a resistor that limits the vpw40 flow to 5mA, which would be 1kOhm.

Bought a calumet tester couldn’t be happier. If it’s PAL it shoots at 25 frames a second, has time code, and is pretty accurate by design.

BPW40 Datasheet, PDF – Alldatasheet

In electronic circuits, some values can be fairly critical, while others may not matter within an order of datashheet unless you are e. Your name or email address: If the color response is different, you might have to use a different light source.

If you have to order by mail, the shipping cost will be larger datashete the cost of these items. The circuit is very simple.

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Nevertheless my tests suported the repair guy’s assertion. Please do not ask for unpaid help via PM, use the forum. 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.

Let’s say i want 25mA.

BPW40 Datasheet PDF

If you want to run the LED continuously then a lower current would probably be advisable. 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 datashete. So, I’d welcome any confirmations. The original thread http: A single phototransitor should be cheap, so you won’t be out much if it doesn’t work. Two other points occur to me: This time determines the width of the blip seen in the trace recorded on the PC.

And do the value R2 and R3 stay the same as in the first schematic? Ok, so mA is too much current for those daasheet. Here’s a link to the items in the online catalogue: 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.

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.

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The other consideration is the amount of charge stored by the capacitor, and any leakage through the recording circuit. Have a Happy New Year all Does anyone – more fluent in electronic components – know where I can buy the following You’re unlikely to get the phototransistor to draw more than a few mA even if you place to right next to the emitter. I built a homemade shuttertester some time ago.

BPW40 Datasheet PDF – Telefunken

The process of shutter opening and closing takes a significant amount of time in relation to the overall shutter speed, and during those periods the shutter is acting as a variable aperture – both reducing the amount of light that gets through so dwtasheet effective speed is shorter than the measured speed, and also affecting the recorded diffraction and depth of field.

Is this schematic correct? Often in experimenters home brew circuits the component values are just something a chap had lying around. No that quote said assuming little or no Vce when the detector was saturated, that is turned on by exposure to light.