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the art of electronics : switching the high side of a load

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Camelkos:
hi everybody,
i'm reading the art of electronics 2 and i'm stuck at the circuit B to switch the high side of a load returned to ground in the chapter of bipolar transistors,
can someone explain it to me please, thank you all !!

bob91343:
We don't all have that book so give us the source and perhaps we can help.

MarkF:
Is this the circuit?



bob91343:
If B is the circuit, then driving Q2 with a pulse will turn it on, which in turn provides base current for Q3 and thus energizing the load.

MarkF:
Duplicate post and answer here:

   https://www.eevblog.com/forum/beginners/the-art-of-electronics-switching-the-high-side-of-a-load-243714/

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