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EAGLE User Support (English) BPV11 Phototransistor pinouts and sample circuit
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  • ldr
  • bpv11
  • phototransistor
Related

BPV11 Phototransistor pinouts and sample circuit

Former Member
Former Member over 9 years ago

I am using a BPV11 photo-transistor to sense ambient light.

 

I cannot find a data sheet with pinouts or a sample circuit. I have used other photo diodes and LDRs before.

 

Thanks,

 

Jeff

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  • autodeskguest
    0 autodeskguest over 9 years ago

    Am 06.12.2014 um 04:48 schrieb Jeff Johnson:

    I am using a BPV11 photo-transistor to sense ambient light.

     

    I cannot find a data sheet with pinouts or a sample circuit. I have used

    other photo diodes and LDRs before.

     

    Thanks,

     

    Jeff

     

    --

    To view any images and attachments in this post, visit:

    http://www.element14.com/community/message/133907

     

     

    This can usually be found in the data sheets of the manufacturers...

    Vishay for example.

     

    --

    Mit freundlichen Grüßen / With best regards

     

    Joern Paschedag

     

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  • autodeskguest
    0 autodeskguest over 9 years ago

    Jeff Johnson wrote:

    I am using a BPV11 photo-transistor to sense ambient light.

     

    I cannot find a data sheet with pinouts or a sample circuit. I have used

    other photo diodes and LDRs before.

     

     

    Page 4 has the pinout:

     

    http://www.vishay.com/docs/81504/bpv11.pdf

     

    --

    Regards, Joerg

     

    http://www.analogconsultants.com/

     

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  • Former Member
    0 Former Member over 9 years ago in reply to autodeskguest

    Thanks Joern (Joerg).

     

    I have had a good session with the wash cloth getting rid of that egg on my face:-).

     

    The data sheet was the first place I went (I am good at reading the manual) and I read through it many times. I even got on the web and found many copies of the same Vishay data sheet scanning it each time but probably with less attention to what I was looking for. I was just getting frustrated seeing only the one data sheet and still I could not find the pinouts.

     

    When I saw the reference to "page 4" I figured, maybe, I missed it after all.

     

    And there it was. Plain as day.

     

    I can only say in my defense that I "assumed" it would be on the first page (with the photo) or maybe second page. After that I almost certainly rushed through the "technical stuff" of graphs and specs and my brain didn't find what it "knew" wasn't there:-(.

     

    Thanks again for taking the time to help out an old (73) techo still very active with microprocessor (PIC) projects.

     

    And, I had also assumed (incorrectly) that the middle pin would be the base pin as it is mostly not provided with photo transistors. When I plodded along trying each combination of two pins until I got a light response I found the correct pinouts and successfully incorporated the BPV11 into my project.

     

    A very grateful,

     

    Jeff Johnson

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  • Former Member
    0 Former Member over 9 years ago in reply to Former Member

    And apologies to the CadSoft Eagle folks for posting this question in the wrong place.

     

    I am a long time Element14 customer but using the forum for the first time.

     

    Jeff Johnson

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  • autodeskguest
    0 autodeskguest over 9 years ago in reply to Former Member

    Jeff Johnson wrote:

    Thanks Joern (Joerg).

     

    I have had a good session with the wash cloth getting rid of that egg on

    my face:-).

     

     

    Happens to all of us.

     

     

    The data sheet was the first place I went (I am good at reading the

    manual) and I read through it many times. I even got on the web and

    found many copies of the same Vishay data sheet scanning it each time

    but probably with less attention to what I was looking for. I was just

    getting frustrated seeing only the one data sheet and still I could not

    find the pinouts.

     

    When I saw the reference to "page 4" I figured, maybe, I missed it after

    all.

     

    And there it was. Plain as day.

     

    I can only say in my defense that I "assumed" it would be on the first

    page (with the photo) or maybe second page. After that I almost

    certainly rushed through the "technical stuff" of graphs and specs and

    my brain didn't find what it "knew" wasn't there:-(.

     

     

    Like when I ask my wife whether she'd seen my glasses. "Yes, dear, on

    your nose" image

     

     

    Thanks again for taking the time to help out an old (73) techo still

    very active with microprocessor (PIC) projects.

     

     

    That ain't old. I have worked with engineers who were seriously into

    their 80's.

     

     

    And, I had also assumed (incorrectly) that the middle pin would be the

    base pin as it is mostly not provided with photo transistors. When I

    plodded along trying each combination of two pins until I got a light

    response I found the correct pinouts and successfully incorporated the

    BPV11 into my project.

     

     

    That's the real engineering spirit, to keep on plodding regardless of

    whether you have enough information or not. And real men don't need no

    maps anyhow ...

     

    I usually do not leave a base unconnected if it's piped out. You can use

    it for many things. If you place a resistor from base to emitter (tens

    to hundreds of kOhm) this reduces the sensitivity but increases speed.

    If you decide to leave it unconnected it might be best to snip it off in

    order to avoid EMI.

     

    --

    Regards, Joerg

     

    http://www.analogconsultants.com/

     

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  • Former Member
    0 Former Member over 9 years ago in reply to autodeskguest

    Hi Joerg,

     

    Thanks for the kind words. It helps to know that I am not alone.

     

    I did snip off the base lead but will keep in mind the base/emitter resistor as I have enough sensitivity but nice to know it increases the speed. I want to experiment with sensing ambient light levels during the down time of the pulse width modulated drive. That is, read the ambient when the LED light source is "off".

     

    Jeff

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  • autodeskguest
    0 autodeskguest over 9 years ago in reply to Former Member

    Jeff Johnson wrote:

    Hi Joerg,

     

    Thanks for the kind words. It helps to know that I am not alone.

     

    I did snip off the base lead but will keep in mind the base/emitter

    resistor as I have enough sensitivity but nice to know it increases the

    speed. I want to experiment with sensing ambient light levels during the

    down time of the pulse width modulated drive. That is, read the ambient

    when the LED light source is "off".

     

     

    Depending on your PWM frequency and max duty cycle a resistor could come

    in handy here. The scope would show you how quickly it drops down to the

    ambient level. Vishay has a brief app notes about the effect:

     

    http://www.vishay.com/docs/83590/fastswit.pdf

     

    --

    Regards, Joerg

     

    http://www.analogconsultants.com/

     

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  • autodeskguest
    0 autodeskguest over 9 years ago

    Ah, glad to see someone older than me still playing in this stuff.  I come

    from the "grid bias and filament transformer" era (I'm 64) and still

    remember when "integrated" was the brief era of the compactron tubes.  The

    advantage to this new fangled stuff is 5 volts (or 3.3v) doesn't bite

    anything like the old 300v plate voltages !!  People just laugh when they

    see my microprocessor controlled heater for the hummingbird feeders (so

    they don't freeze when we get the cold snap here in the Seattle area).

     

    mikey

     

    --

    Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

     

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