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Author Topic: Another kit: All-discrete power supply  (Read 76334 times)

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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #125 on: January 18, 2014, 01:31:04 am »
:palm:

D'oh.

Clearly I screwed up that section. Looking more closely, I don't know why I ever thought it would work.

I'm going to take those resistors (and diodes) that I was going to have placed on the sense jacks, and just put them on the PCB. Then there are no bananas.

I was just about to test that, too...
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #126 on: January 20, 2014, 03:44:30 am »
Hmm.... the local regulator definitely needs some form of current limit... the magic smoke comes out very quickly if shorted :-BROKE
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Offline codeboy2k

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Re: Another kit: All-discrete power supply
« Reply #127 on: January 20, 2014, 03:42:17 pm »
Quote from: c4757p on January 20, 2014, 03:44:30 am
Hmm.... the local regulator definitely needs some form of current limit... the magic smoke comes out very quickly if shorted :-BROKE
Can we custom order the smoke color :)
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #128 on: January 20, 2014, 03:44:20 pm »
Any customer can have magic smoke in any color that he wants so long as it is blue.
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Offline idpromnut

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Re: Another kit: All-discrete power supply
« Reply #129 on: January 21, 2014, 01:35:47 pm »
Is there a board available that you could shot me? I'd be interested in testing it out :)
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #130 on: January 21, 2014, 02:12:13 pm »
Not yet. Still working on my home-etched one.
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #131 on: January 24, 2014, 08:51:52 pm »
Updated schematic. I'm etching another PCB today or tomorrow, but I have to order parts, because.....

- Local regulator has been updated. It is now short-circuit safe. May all the transistors that died when I found out how horribly not short-circuit safe it was rest in piece(s).
- It now also doubles as the voltage reference, rather than having two separate parts.

I've got it on GitHub and will post the URL when I get the source files cleaned up a bit.
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #132 on: January 25, 2014, 04:23:04 am »
Possibly final schematic and PCB.
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #133 on: January 31, 2014, 09:47:27 pm »
Sorry for the long delay, but... other things to do. :)

I held off on ordering parts because I was finishing another circuit design too and wanted to order them together. Will order tonight...
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Offline Thor-Arne

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Re: Another kit: All-discrete power supply
« Reply #134 on: March 30, 2014, 04:37:25 pm »
What's the status of this project?
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #135 on: March 30, 2014, 04:49:44 pm »
Slow. Sorry - I've been busy. Delay after delay after delay... :scared:

I've made quite a few changes after some testing. I've made way too many "OK, this is the final version, PCBs soon!" promises though, so I'm not going to post and boast until I have it thoroughly tested ;D
« Last Edit: March 30, 2014, 04:56:31 pm by c4757p »
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Offline Thor-Arne

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Re: Another kit: All-discrete power supply
« Reply #136 on: March 30, 2014, 04:55:34 pm »
That's ok. Just wondering since it's been a while.
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #137 on: April 20, 2014, 07:08:04 pm »
Quote from: Thor-Arne on March 30, 2014, 04:55:34 pm
That's ok. Just wondering since it's been a while.

You're not kidding - here I am, back in almost a month, and it's still not done! :scared:

Here's a new schematic. Hmm... let me see if I can summarize the changes. It's been a while.
  • Most obvious - schematic has been broken into a hierarchical with block diagram. This makes documentation easier, and it can be printed onto standard US Letter paper. I'll check that it also fits on A4.
  • Some areas have functional explanations on the schematic itself. These are not meant to replace the ones in the manual.
  • A stiffer current source biasing the error amplifier means better CMRR - better load regulation.
  • Current sense is now ground-referenced, making that section no longer shitty. ::)
  • Thermal cutoff behaves better: pseudo-thyristor latch current no longer flows on the feedback path.
  • Local rail is now -12V on all versions of the circuit, rather than -32V on the high voltage one and -20V on the low voltage one.
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Offline Thor-Arne

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Re: Another kit: All-discrete power supply
« Reply #138 on: April 21, 2014, 08:21:01 am »
Great!

Nice to see progress on this project.  :-+
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Offline at2marty

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Re: Another kit: All-discrete power supply
« Reply #139 on: April 21, 2014, 07:47:17 pm »
Very nice project!  I thought you mentioned earlier in this thread about putting stuff on Github.  Can you provide a link?
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #140 on: May 05, 2014, 12:37:45 am »
A few changes again...

Decided I hate the multiple-page schematic. It's just too much for something like this - obscures details until you flip the page.

Completely new PCB.

Quote from: at2marty on April 21, 2014, 07:47:17 pm
Very nice project!  I thought you mentioned earlier in this thread about putting stuff on Github.  Can you provide a link?

Yup, right here. Though, pretty much everything outside Proj-Main/ is out of date right now.
« Last Edit: May 05, 2014, 12:40:57 am by c4757p »
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #141 on: May 16, 2014, 02:32:39 am »
Final version which was sent out this morning:
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Offline cellularmitosis

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Re: Another kit: All-discrete power supply
« Reply #142 on: May 16, 2014, 06:12:23 am »
Woo hoo!
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Offline kizzap

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Re: Another kit: All-discrete power supply
« Reply #143 on: May 16, 2014, 07:57:52 am »
Quick: everyone point out all the errors!
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Offline jaxbird

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Re: Another kit: All-discrete power supply
« Reply #144 on: May 16, 2014, 02:23:49 pm »
Looks nice  :-+ 

Any specific reason for not including component labels (R1, R2 etc) in the silk screen?

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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #145 on: May 16, 2014, 02:40:17 pm »
In some places, it was surprisingly difficult to make them fit (while still being obvious which label went to which part). I'd rather leave them off than have them be confusing. The assembly directions will have expanded diagrams of each section with the parts visibly labeled.
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Offline jaxbird

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Re: Another kit: All-discrete power supply
« Reply #146 on: May 16, 2014, 03:02:13 pm »
Quote from: c4757p on May 16, 2014, 02:40:17 pm
In some places, it was surprisingly difficult to make them fit (while still being obvious which label went to which part). I'd rather leave them off than have them be confusing. The assembly directions will have expanded diagrams of each section with the parts visibly labeled.

Yeah, it can be a mess sometimes :) .. Not so important as long as you have a nice big drawing with the labels.

It does look very nice and clean,  I like the groupings.

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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #147 on: June 14, 2014, 01:26:22 am »
Got the PCBs, and did a bit of testing today; more tomorrow. Here's the line regulation of the local regulator block:
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Offline c4757pTopic starter

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Re: Another kit: All-discrete power supply
« Reply #148 on: June 14, 2014, 05:22:21 pm »
More local regulator testing - power supply rejection/ripple rejection vs. frequency. LM317 is included in the plot for comparison. The performance isn't amazing at higher frequencies, but it doesn't need to be, and it's still quite good at the frequency of the line ripple.
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Offline Thor-Arne

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Re: Another kit: All-discrete power supply
« Reply #149 on: June 14, 2014, 09:49:13 pm »
Nice.  :-+

Will the measurement setup be included in the doc eventually?
That would be very useful to me for one as I have no clue.  :-//
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