BD649 DATASHEET PDF

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Jul 21, 7 0. Suppose the PT is 5 mS and the darlington is 20 mS. I would start by re-designing this. Does anyone have any suggestions? R1 is k and R3 is 50k. Jul 22, 9. Are you referring to R3? Jul 21, 5. Do you realize how short that flash from the camera really is? Jul 21, 3. 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 facing forward and the opto-transistor mounted on the reverse side of the circuit board, facing the built-in flash.

So, yes I guess the IR filter might help, but the twisted pair is perhaps excessive? Quote of the day. If the current assumption is that it receives too much light and we have datasheeh reduce it with the IR filter.

You route that to the base of the transistor. When a light flash happens the opto will suddenly allow dataeheet lot more current. And the tailing off from the phosphorous in the white LEDs may become a problem at fast moving objects.

The Darlington transistor needs about 1. TOP Related Posts.

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