Many, many questions keep getting asked about this thing and people keep attempting to build it without even knowing the basics, why I don't know. The power supply suffers from a couple of issues that have never really been adequately addressed so this is going to be my attempt at bringing this thing into the modern age. What follows is just preliminary work to right several wrongs I've noticed with the design. It's not complete but I'm posting it to get opinions and suggestions.
This paragraph is for the newbies: DO NOT ATTEMPT TO BUILD THIS YET. If you don't know what you're doing, do not even try and breadboard this. Once I have a final design, I promise that I'll post it.
Now, onward. I'm posting my spice simulation for anyone that wants to try and give this a go. One of the things that concerns me is the power dissipation in the op amps but I'm not sure how to get this down to a more acceptable level because I don't think 150mW at load is very good so suggestions are most welcome.
First, the voltage reference in the old version was an extremely odd thing to me so what I wanted to do was get a precision reference in there to work with. 10V seemed like a nice round number so that's what I went with and I actually have one on hand to use.
Second, the sense resistor. 0.47 ohms? Once again, odd. Plus, it suffers from extreme power dissipation as well. My idea is to have a nice 0.1 ohm 3W 4 wire resistor in there to hook a meter to so I adjusted things around the reference to get me to where I wanted to be and I also have some of these.
What I'd like to eventually do is design the meters along with the supply so that what we end up with is a relatively complete project with all the nice bits people seem to be after. No one, I repeat, no one ever offers a suggestion as to what to build to replace this, not one single engineer. They will, however, be the first people to tell you how bad the design is but never offer any sort of advice as to why. I know, I've asked and so have many other people.
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0-30V Stabilized Power Supply
in Projects Q/A
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Hi liquibyte,
Did you ever progress this project? Did you solve/test the power on transient issue that is mentioned elsewhere in this thread?
Thanks for your help