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 Reply to Thread. Jul 21, 2.
BD datasheet, Pinout ,application circuits NPN SILICON POWER DARLINGTONS
Yes, my password is: Sep 24, 2, Jul 21, 5. 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.
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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. Whether that be from it’s own flash or any other light source. Quote of the day. That’s what fatasheet SCR and a capacitor will do.
Measure the current through the opto-transistor in ambient light. R1 should only be necessary if the adjustment leg will eat too much current when the flash fires. Jul 22, 9. Jul 21, 4. Jul 21, 3.
But that’s something I can olny find out when the electronics work. Your name or email address: 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. So, yes I guess the IR filter might help, but the twisted pair catasheet perhaps excessive?
No, create an account now. 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. That’s going to be 25 mS delay in the flash of the LED’s. Generally a good job for an SCR. Nov 30, 18, 9, Hypatia’s Protege likes this. One-Time Programmable Memory in Action: Just playing devil’s advocate here. The unit works well, although not as bright as flash tube, but good for macro photography.
OK thank you all for your thoughts on this. You route that to the base of the transistor. Have I got that right? Jul 21, 1.
Solving for two resistor values in a resistor-divider network Posted by jerseyguy in forum: And the tailing off from the phosphorous in the white LEDs may become a problem at fast moving objects. Will this work if you don’t have any way to stop the LEDs quickly?
If the current assumption is that it receives too much light and we have to reduce it with the IR filter. Jul 22, 6. You suggested a 22k in series with the trim pot meter, and none in series with the opto-transistor. But yes, speed matters.