Source of tension that works to constant current around the maximum tension of exit up to 15 V
This source will be able to work to constant intensity around the maximum tension of exit up to 15 V, that is to say between 24 and 15 V. This due to zener of 2.7 V.
The diodes and transistors are the corresponding ones to the previous source.
In P1 the voltage adjustment will become and in P2 the current adjustment
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