The totem pole is simply 2 transistor that combined together , a first transistor will charge the load ( give it voltage ) and another will discharge it ( will connect it to the ground when the time of operation is over . and it will provide a good square wave .
and you should increase the supply voltage . e.g about 10 volt.
Regards
Goldsmith
The circuit is fine. If you powered it from more than 5V then you would have more accuracy in setting the LED current, although that could be improved at 5V with a single transistor buffer if required anyway.
Keith
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