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’d thought of this too, to protect the opto-transistor in case I dialled the trim pot meter to 0ohm. Posted by striplar in forum: Will this work if you don’t have any way to stop the LEDs quickly? 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.

Jul 21, 4. But if it’s in series with the opto-transitor, it’s multifunctional. 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 darlington at 0.

As you could see from my pictures, the unit is a rectangular circuit board that slides in a Cokin filter holder with the LEDS datawheet forward and the opto-transistor mounted on the reverse darasheet of the circuit board, facing the built-in flash.


(PDF) BD649 Datasheet download

Now, putting the opto-transistor right in front of the built-in flash? Jul 23, Jul 21, 3. Generally a good job for an SCR.

Determining resistor values in a mesh. R1 should only be necessary if the adjustment leg will eat too much current when the flash fires. Maybe on my second try. Hypatia’s Protege likes this.

Resistor values in flash slave | All About Circuits

Lets try 30 ua in ambient light. Mar 1, 3, 2, Jul 21, 2.

How are you with mosfets? And it looks like they should work. You May Also Like: Quote of the day. Jul 21, 5. But that’s something I can olny find out when the electronics work.

You can not get to zero volts and you don’t need to. The opto-transistor can only allow. Jul 22, 8.


And the tailing off from the phosphorous in the white LEDs may become a problem at fast moving objects. You suggested a 22k in series with the trim pot meter, and none in series with the opto-transistor. Resistor Values Posted by tquiva in forum: I’ve learned quite a bit here, but I can put this project at dataxheet and tidy up now and focus on other things again. Whether that be bd6649 it’s own flash or any other light source.


Nd649 5, 1, 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.

You get the power in the capacitor and you can’t stop the light until the capacitor is empty. Just playing devil’s advocate here.

Have I got that right? I want it to be triggered by the camera’s built in flash, but I can’t get it to work satisfactorily. Are you referring to R3? Solving for two resistor values in a resistor-divider network Posted by jerseyguy in forum: 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 bc649 the flash, the LEDs don’t seem to work.

But yes, speed matters.