Collector-base voltage (IE = 0). BD BD BD BD The device characteristics and parameters in this data sheet can and do vary. BD Transistor Datasheet pdf, BD Equivalent. Parameters and Characteristics. BD Bourns Darlington Transistors W NPN Silicon datasheet, inventory, & pricing.

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Resistor values in flash slave

Jul 21, 5. R1 is k and R3 is 50k. Jul 22, 8. May 27, 52 Maybe on my second try. If you could build your dream bench, what would you put on it?

So, yes I guess the IR filter might help, but the twisted pair is perhaps excessive? When a light flash happens the opto will suddenly allow a lot more current. Posted by striplar in forum: Then the adjustment leg is designed to develop less than 1 volt at that current, and some adjustability to compensate for ambient light.

Mar 5, 1, When I shine a torch on the photo resistor, it saturates and the LEDs light up bright, but when I try to activate the system with the flash, the LEDs don’t seem to work.


Lets try 30 ua in ambient light. Are you referring to R3?

You size R3 to limit the total opto current to 0. Jul 21, 4. Jul 21, 3. Mar 1, 3, 2, Jul 21, 2. I think there should be one in series with the opto-transistor, datasgeet I can adjust the voltage at the point to the darlington to be 0v at ambient light.

So I guess my main question is, how do I calculate the size of R1 and R2 so it protects both the opto-transistor and the base of the datwsheet at 0. Just playing devil’s advocate here.

BD Datasheet(PDF) – Siemens Semiconductor Group

One-Time Programmable Memory in Action: And the tailing off from the phosphorous in the white LEDs may become a problem at fast moving objects. Whether that be from it’s own flash or any other light source. Jul 21, 1.

Does anyone have any suggestions? Generally a good job for an SCR. You can not get to zero volts and you don’t need to. Have I got that right? OK thank you all for your thoughts on this.

BD649 Datasheet

Jul 22, I’d thought of this too, to protect the opto-transistor in case I dialled the trim pot meter to 0ohm. Jul 21, 7 0.


Without it the current through the opto-transistor at ambient light is sufficient to saturate the base of the darlington, and the LEDs are dahasheet on. The photo transistor is probably an IR type can’t find a visible light onebut I expect a flash tube to emit a broad light spectrum including sufficient IR to saturate the photo transistor.

Hypatia’s Protege likes this. OK, I’m going to open my mouth on this. Solving for two resistor values in a resistor-divider network Posted by jerseyguy in forum: You May Also Like: Resistor Values Posted by tquiva in forum: But if your PT photo transistor is rated for 50 mS and you opt for one that is much faster, the next question is: Now, putting the opto-transistor right in front of the built-in flash?

Sep 24, 2, Your name or email address: See where I’m going with this?