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I use a period counter datassheet the actual measurement, but plugging the sensor into a computer soundcard would do just as well. You might want to get a digikey datassheet that has a zillion parts in it. Or do we assume the current is fixed at 5mA and try to ensure the voltage drop across the phototransistor is correct to toggle the reading at the collector? But, I’m moreso looking for a source of the parts rather than a revision or rehashing of the technology. That means it will fit into both 35mm and cameras, and can just be held behind an LF shutter.
Bought a calumet tester couldn’t be happier.
BPW40 Datasheet PDF –
Here are some DIY alternatives: And do the value R2 and R3 stay the same as in the first schematic? Maybe at faster speeds a different spring is active. The other consideration is the amount of charge stored by the capacitor, and any leakage through the recording circuit. You will probably have an easier time finding either 3. Thanks in bunches to you guys. Higher resistance gives more sensitivity. Dataeheet the recording into any basic DV editing software that comes for free with modern datashewt, allows you to literally count the number of frames the shutter is open for at a vpw40 shutter speed – so that a one second exposure should have the shutter open for 25 frames PAL or 30 frames NTSC.
BPW Phototransistor, plastic housing, wired at reichelt elektronik
Here’s a link to the items in the online catalogue: Often in experimenters home brew circuits the component values are just something a chap had lying around. I previously used a quite 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. You must log in or sign up to reply here. 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.
With a filter Capacitor, bleeder resistor, pull down resistor the circuit tolerance values can be large. Share This Page Tweet.
(PDF) BPW40 Datasheet download
Exposure tests are more reliable in those circumstances. I mounted the sensor in a piece of opaque plastic panel, cut to 60 by 35mm datashet size. If it’s NTSC it shoots even faster, at If you want to run the LED continuously then a lower current would probably be advisable. It then gave the current through the device.
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 the effective datasheeg is shorter than the measured speed, and also affecting the recorded diffraction and depth of field. Two other points occur to me: So if a store doesn’t recognize these values, they know nothing about electronic components.
A single phototransitor should be cheap, so you won’t be out much if dqtasheet doesn’t work. Formal verification of safety-critical software, software development, and electronic design and prototyping.
Why people publish such daft and datasheeet precise values, I don’t know. Regarding the resistor R2 connected to the phototransistor, the value you need depends on how sensitive you want the detector to be.
It relies on the phototransistor having a fast switching speed in response to seeing the light through the shutter. 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?
The datasheet tells us here that the voltage drop is 1. When the shutter closes, the phototransistor switches off the supply, and the capacitor discharges, producing a similar blip in the opposite direction on the trace. 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.
You’re going about the choice of resistor for the phototransistor the wrong way.
Please do not ask for unpaid help via PM, use the forum. 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. He was initially using the internal pullup resistor in the Arduino which has a value of around 20K to substitute for R2.
This is probably the problem encountered by the previous poster. If you have to order by mail, the shipping cost will be larger than the cost of these items.
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. But this is datashee a guess since you haven’t referenced the circuit diagram. For faster shutter speeds I wouldn’t want to blw40 on the measured time between the shutter beginning to open and completely closing to determine the effective shutter speed.
If the color response is different, you might have to use a different light source. Since it is the 5RC value that is important, any values of R and Dstasheet that produce 5RC in the range of say microseconds should work.
The former is assured by the power source you use, whereas the latter is typically done with a resistor.
Shutter Speed Tester – DIY Build – Electronics Parts
About the detector, the wpb40 that one is next. So we need to choose a resistor that limits the current flow to 5mA, which would be 1kOhm. The last page of the datasheet shows the voltage drop for other current flows so you could use this to adjust the resistor to reduce the current flow if necessary hint: It is not critical – though obviously if it becomes too long then the blip will not be complete before the shutter closes, and if it is too short then it will probably be bpa40 out by recording circuitry.
Let’s say i want datasgeet. So let’s say i want 25mA is that good?
Thanks for all the responses so far.