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Constant current source adjustable by PWM

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delphes123:

on #35 I only see V1 = 12V

Zero999:
The circuit attached to the original post won't work. D1 & D2 will blow up, as there's nothing to limit the current.

Is it really PWM to a linear constant current, or just PWM'd constant current which is required? Is the 5V supply well-regulated?

Is it a purely resistive load?

PCB.Wiz:

--- Quote from: delphes123 on July 22, 2023, 01:27:47 pm ---
on #35 I only see V1 = 12V

--- End quote ---

 PNP_NPN_current_Sink_5.PNG has a new V3 added, for 5V supply to R4

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