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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Jul 23, I would start by re-designing this. You May Also Like: So I guess my vd649 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. Lets try 30 ua in ambient light.
I guess it’ll always be 3 volt, and in my case. Jul 22, Then the adjustment leg is designed to develop less than 1 volt at that current, and some bd469 to compensate for ambient light. Suppose the PT is 5 mS and the darlington is 20 mS. Datasheef light source consists of five series of ten bright white LEDs, each series with it’s own ohm resistor. Will this work if you don’t have any way to stop the LEDs quickly?
BD SEMELAB, BD Datasheet
OK thank you all for your thoughts on this. 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.
You get the power in the capacitor and you can’t stop the light until the capacitor is empty.
Measure the current through the opto-transistor in ambient light. First measure the current through the opto transistor in ambient lighting conditions to find datashet off leakage current.
Generally a good job for an SCR.
Jul 21, 3. Yes, my password is: I’ve looked on-line and saw some diagrams without an R1 or an R2, but wouldn’t that blow the BD or the photo transistor when it saturates? You suggested a 22k in series with the trim datashfet meter, and none in series with the opto-transistor.
Jul 22, 7. Have I got that right? Just playing devil’s advocate here. That’s not going to blow out anything.
Nov 13, Mar 5, 1, Sep 24, 2, Now, putting the opto-transistor right in front of the built-in flash? Whether that be from it’s own flash or any other light source.
BD Datasheet(PDF) – Inchange Semiconductor Company Limited
You can not get to zero volts and you don’t need to. And it looks like they should work. Jul 21, 2. Resistor Values Posted by tquiva in forum: The Darlington transistor needs about 1.
Resistor values in flash slave Reply to Thread. R1 is k bd6449 R3 is dataseet. 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.
Are you referring to R3? Hypatia’s Protege likes this.
Quote of the day. If you could build your dream bench, what would you put on it? 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. Jul 21, 1.