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MrAl , Yes Mr. Al , I but I don't know any sourcing constant current drivers that can handle the higher voltages of series LEDs. Eg 12- 15V
Multiple digits.
Look at T1. There is feedback.Hi Ron:
I don't see how that regulates current equally across the LEDS. There isn't any feedback for each LED.
On the hobby level you should use transistors not FETs.BTW, would replacing the bipolars with low Rds logic level NFETS be an improvement?