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The Project (Read 241 times)
Larry Bradley
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The Project
Mar 4th, 2022 at 9:47pm
 
I finally got my board built, the one that generated all those recent feature requests. Roger, I couldn't have done this without VeeCad. It is a 4"x6" board, the controller for a 0-15V 20 amp power supply. It is complicated, since it has the regulator, current detection, current limiting, current overload protection, pass transistor power dissipation measurement (using an analog multiplier chip) that controls the cooling fans and triggers a shutdown if dissipation goes to high. All totally unnecessary, but fun to design and build Smiley
I've attached a photo of the board. I used the jumper wires from my breadboarding stuff, rather than make the links. Saved a LOT of time and reduced errors.
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Roger Lascelles
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Re: The Project
Reply #1 - Mar 5th, 2022 at 10:25am
 
Hello Larry

20 amps. You will have fun running it up for the first time.
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Roger
 
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Larry Bradley
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Re: The Project
Reply #2 - Mar 5th, 2022 at 2:34pm
 
Actually it is an old supply I built 25 years ago. It died last year (the 723 regulator died), so I decided to modernize it rather than just replace the 723. I got carried away a bit! I built up the new controller section by section on prototyping strips (a la Fritzing, but I didn't use Fritzing for layout), and tested each section as I went, hooked up the the big supply. First the regulator, then the current sense, etc. I drew the VeeCad layout as I went along.

When the entire design was done and tested as a propotype, I built up the stripboard section by section, and tested again.
As I built each section, I used an ohmmeter to verify all the wiring against the schematic, and to check for solder bridges, etc. Found a few of bridges! Then installed the ICs and connected up the the supply. Did this section by section. Sort of the same way I do software design.

It works like a charm. For load testing, I bought a bunch of small halogen bulbs and sockets (12v @5 amp) and connected them up with switches so I have a variable load from 0 to 25 amps in 5 amp steps. Very bright when I have them all on!

Just working on the front panel now. Been a fun project.
I used to do a lot of microcontroller stuff, using PICs. Going to get back into that, using stripboard and TinyCad/VeeCad.

I also just downloaded Delphi. (I used to have it back in my Windows days ... I'm a Linux user now), so I am going to look at the VeeCad source to see if I can do anything with it.

Thanks again for this great piece of software, Roger.
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Roger Lascelles
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Re: The Project
Reply #3 - Mar 6th, 2022 at 8:29am
 
Hi Larry

Now that you have conquered VeeCAD, you have a tool for quick little jobs.

I will make a separate post about my thoughts on VeeCAD code, and the future.
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Roger
 
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