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.

Author: Dojinn Taubar
Country: Qatar
Language: English (Spanish)
Genre: Technology
Published (Last): 26 August 2010
Pages: 115
PDF File Size: 3.63 Mb
ePub File Size: 10.65 Mb
ISBN: 630-3-90233-889-7
Downloads: 62879
Price: Free* [*Free Regsitration Required]
Uploader: Vir

But if it’s in dtasheet with the opto-transitor, it’s multifunctional. You May Also Like: Jul 22, 9. Jul 22, If you could build your dream bench, what would you put on it? I’m working on the idea that when the built-in flash is blocked by a large macro lens at close range, the LED ring will compensate, and the camera will calculate from whatever it ‘sees’ through datashert lens.

May 27, 52 Just playing devil’s advocate here. Set R2 to allow that current to create not more than one volt.

BD Datasheet – General purpose NPN Darlington transistor from Power Innovations

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.

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. Now, putting the opto-transistor right in front of the built-in flash? Will this work if you don’t have any way to stop the LEDs quickly? Resistor Values Posted by tquiva in forum: You suggested a 22k in series with the trim pot meter, and none in series with the opto-transistor.


Are you referring to R3? Lets try 30 ua in ambient light. Discussion in ‘ General Electronics Chat ‘ started by roukeJul 21, Do you realize how short that datashet from the camera really is?

You get the power in the capacitor and you can’t stop the light until the capacitor is empty. I’m trying to make a flash slave as in the attached diagram. Jul 22, 7.

R1 is k and R3 is 50k. If the current assumption is that it receives too much light and we have to reduce it with the IR filter. LEDs and Solar Cells Combine into Devices that Emit and Absorb Light Researchers have developed double-heterojunction nanorods which can be biased to both send and receive light—in other datashret, a device that is both an LED and solar cell, capable of emitting and absorbing light.

The datashdet works well, although not as nd649 as flash tube, but good datashwet macro photography. Jul 22, 8. But that’s something I can olny find out when the electronics work.

I’ve learned quite a bit here, but I can put this project at rest and tidy up now and focus on other things again. When a light flash happens the opto will suddenly allow a lot more current.

I’m a newbie The recommended current through the Datsaheet is 20mA and the max mA OK for a short flashhence the smaller resistors when the system is in flash mode. Have I got that right? Jul 21, 4. Without it the current through the opto-transistor at ambient light is sufficient to saturate the base of the darlington, and the LEDs are always on.


Mar 1, 3, 2, Then the adjustment leg is designed to develop less than 1 volt at that current, and some adjustability to compensate for ambient light. Generally a good job for an SCR. Hypatia’s Protege likes this.

Nov 13, Measure the current dataseet the opto-transistor in ambient light. How are you with mosfets? Yes, my password is: I would start by re-designing this. I guess it’ll always be 3 volt, and in my case.

BD649 Datasheet, Equivalent, Cross Reference Search

Maybe on my second try. I want it to be triggered by the camera’s built in flash, but I can’t get it to work satisfactorily.

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 datashwet base of the darlington at 0. Suppose the PT is 5 mS and the darlington is 20 mS. You can not get to zero volts and you don’t need to. But yes, speed matters. And the tailing off from the phosphorous in the white LEDs may become datqsheet problem at fast moving objects. Determining resistor values in a mesh. That’s not going to blow out anything.

BD649 Datasheet

That’s what an SCR and a capacitor will do. I may be wrong – honestly, I’m not sure. Does anyone have any suggestions?

One-Time Programmable Memory in Action: