The Modular Bench Power Supply ++, Putting it all together, the bare bones

4 Dec 2014

I will be putting together the video this week end to go with this schematic but I thought i would share this with you in the mean time

VCC can be as much as 40V (I was powering the test circuit on a breadboard with a bench PSU for now set to 30V, my psu max)

In the video I will be reviewing the behaviour of this circuit as well as Identifying a few pitfalls (Nothing serious and probably acceptable for a basic PSU but we do want to evaluate where we can improve on things

If you think you know the potential issues, please post and we will compare notes at the weekend (There are two primary ones)

Here is the video that describes and goes through some basic tests of this circuit

Enjoy, again, a little detailed so its is about an hour long

I will be adding notes etc in the next few days

Former Member over 10 years ago

Hi
I built this on a bread board seems very good need to add a meter to it
what is the number of the Vishay four wire sense resistor that you used I cant find it I used a 1% .100ohm 5 watt sense resistor ,seems ok
Garry
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jw0752 over 11 years ago in reply to michaelkellett

Hi Michael,
I have put an LTC6090 on my "to get list" and look forward to checking it out.
John
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michaelkellett over 11 years ago in reply to jw0752

Just spotted this op amp:

LTC6090 - can't get it from Farnell or RS yet but Digikey have them. Rail to Rail out, +/- 70V supplies - nice if you want to push the output voltage further but pricier than the TLE2142. Has anyone simulated this circuit yet ?

MK
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heffa over 11 years ago

Peter, will you be publishing a BOM for the project for us that are lazy and don't feel like digging around in the store too much to find the correct part numbers to follow you on a breadboard? :-)
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jw0752 over 11 years ago in reply to Robert Peter Oakes

Hi Peter, I got in the TLE2142 Op Amps today and so I set up the same experiment that I did with the ISL28218. I found the TLE op amps to be much more linear and they took the voltage all the way to 0 volts. On the high end using a IRF511 FET for the output I was able to get to within 5.7 volts of the supply rail. I agree that the TLE 2142 seems to be the best choice.
John
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