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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I would start by re-designing this. R1 should only be necessary if the adjustment leg will eat too much current when the flash fires. Nov 13, Really don’t think you are going to get that circuit to respond fast enough. Yes, my password is: But I think that’s what you’re saying albeit in other words ;- However, if R1 and R2 are high enough, the current through the base of the darlington would also be limited to a safe level.

Jul 22, 9. The opto-transistor can datashee allow. Jul 21, 5. As you could see from my pictures, the unit is a rectangular circuit board that slides in a Cokin filter holder with the LEDS facing forward and the opto-transistor mounted on the reverse side of the circuit board, facing the built-in flash.

It either emits nearly invisible preflashes and analyses results to adjust flash output.


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Set R2 to allow that current to create not more than one volt. Jul 23, I’d thought of datashdet too, to protect the opto-transistor in case I dialled the trim pot meter to 0ohm. But yes, speed matters. I may be wrong – honestly, I’m not sure. Jul 22, 8. Mar 1, 3, 2, Just playing devil’s advocate here.

What you want to do is allow the input power source to charge up a capacitor, and then when your light sensor senses the external flash, dump that cap into the LEDs. One-Time Programmable Memory in Action: See where I’m going with this?

No, create an account now. Your name or email address: And it looks like they should work. Determining resistor values in a mesh. Are you referring to R3?

You get the power in the capacitor and you can’t stop the light until the capacitor is empty. But that’s something I can olny find out when the electronics work. I’ve learned quite a bd6649 here, but I can put this project at rest and tidy up now and focus on other things again.

You can not get to zero volts and you don’t need to. Have I got that right? May 27, 52 That’s not going to blow out anything.

BD Datasheet PDF –

You May Also Like: Will this work if you don’t have any way to stop the LEDs quickly? Sep 24, 2, Jul 22, 6. Now, putting the opto-transistor right in front of the built-in flash? When a light flash happens the opto will suddenly allow a lot more current.


If the current assumption is that it receives too much light and we have to reduce it with the IR filter. I’m a daasheet The recommended current through the LEDs is 20mA and the max mA OK for a short flashhence the smaller resistors when the system is in flash mode. Hypatia’s Protege likes this. How are you with mosfets? Nov 30, 18, 9, You size R3 to limit the total adtasheet current to 0.

Generally a good job for an SCR. R1 is k and R3 is 50k. I guess it’ll always be 3 volt, and in my case. OK thank you all for your thoughts on this. The datasheet says the gain is aboutbut you seem to have a different data sheet with different gain values for different mA and volt values.

Whether that be from it’s own flash or any other light source.