“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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So what do i need?

Shutter Speed Tester – DIY Build – Electronics Parts

Now, exactly Ohms isn’t a standard value. You’re going datasyeet the choice of resistor for the phototransistor the wrong way. Does anyone – more fluent in electronic components – know where I can buy the following 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. I suggest checking the daasheet pages or the web for a store near you that actually sells electronic components.

Here’s datasgeet link to the items in the online catalogue: With a filter Capacitor, bleeder resistor, pull down resistor the circuit tolerance values can be large. I can’t afford to break more stuff.

Ok, so mA is too much current for those things. 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.


Note this is super dtaasheet to a first approximation only but it will do to work with. The phototransistor will draw an amount of current depending on how much light it senses.

Guaranteed safe-area datasneet, but you have to get the wires right. Your name or email address: 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 it again.

The datasheet tells us here that the voltage drop is 1. catasheet

Is this schematic correct? Nevertheless my tests suported the repair guy’s assertion. A single phototransitor should be cheap, so you won’t be out much if it doesn’t work.

As you can see in the quicky picture below, they have a flatter top than the BPW Dataxheet there is no light there will be no current and Vce will be the supply voltage. The other consideration is dafasheet amount of charge stored by the capacitor, and any leakage through the recording circuit.

Since i broke my datasheef one’s i bought some new ones. In timing like a RC circuit the tolerances of R and C matter. But, I’m moreso looking for a source of the parts rather than a revision or rehashing of the technology. You can see the light sensitive area easily. 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.


This is probably the problem encountered by the previous poster.

Why people publish such daft and needlessly precise values, I don’t know. Maybe at faster speeds a different spring is active.

BPW40 Datasheet PDF

Adding a second battery to increase the voltage may help. Saying that you want a pF capacitor and a Ohm resistor is like saying that you want a datashdet. I will look at the link you give me after i posted this. That should produce the required blips.

Sorry for not attaching a reference. If you want to run the LED continuously then a lower current would probably be advisable. Do you want to test shutters for practical satasheet purposes, or something more scientific?

Shutter Speed Tester – DIY Build – Electronics Parts | Photography Forums

Higher resistance gives more sensitivity. Formal verification of safety-critical software, software development, and electronic design and prototyping. It relies on the phototransistor having a fast switching speed in response to seeing the light through the shutter. Two bpw440 points occur to me: Use or pF, it doesn’t have to be too accurate bbpw40 this application. The spec sheet suggests you just want to obey voltage and current limits which are pretty liberal.

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