Author Topic: "Stimpy Shunt" regulator  (Read 6121 times)

Gen. Dreedle

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"Stimpy Shunt" regulator
« on: July 26, 2011, 06:55:15 PM »
Calling it a regulator might be an insult, to real regulators, but it is a "Stimpy".

OK............2 PNPs, 2 resistors, and a string of LEDs. Guess what it is. Probably about as good a regulator, as the most famous shunt (Zener diode). Just a lot more parts, probably a lot quieter, and all the glowing pieces of plastic...........

(It was just a silly idea, at 4 AM.) (But it worked.)
"Major Danby, sir."
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seagreen

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Re: "Stimpy Shunt" regulator
« Reply #1 on: July 26, 2011, 10:04:30 PM »
Why was that silly?   :o
No double blind testing was used in the making of this post.

Gen. Dreedle

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Re: "Stimpy Shunt" regulator
« Reply #2 on: July 26, 2011, 11:42:44 PM »
Ask the gang at "Over Engineering". Lots of parts, but poor regulation. Would never survive an ABX DBT.
"Major Danby, sir."
"Danby. D-A-N-B-Y."
"Take him out and shoot him."
"Sir?"
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seagreen

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Re: "Stimpy Shunt" regulator
« Reply #3 on: July 27, 2011, 12:15:30 AM »
Ahh, that kind of silly.

Personally, I don't think that having uber tight voltage control is what's important here.  It's controlling the current path and minimizing noise from the supply rails - all while not adding much more noise. 

But, what do I know?

Anyway, Stimpy type regulators tend to do silly pretty well.  (Ever try the Transistors Formerly Known as Zetex??)
No double blind testing was used in the making of this post.

MystereoN

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Re: "Stimpy Shunt" regulator
« Reply #4 on: July 27, 2011, 03:18:20 AM »
we all like "Stimpy" type regulators :)

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Gen. Dreedle

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Re: "Stimpy Shunt" regulator
« Reply #5 on: July 27, 2011, 03:47:05 AM »
Not even close!

Remember, two PNPs.
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"Take him out and shoot him."
"Sir?"
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MystereoN

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Re: "Stimpy Shunt" regulator
« Reply #6 on: July 27, 2011, 04:45:58 AM »
yes, I know, there are 2 PNP's, 2 resistors and string of LED's. Above is just another example of "Stimpy" reg, even simpler  :)

But with 2 transistors, a bunch of LED's and resistors, I would exchange bunch of LED's for resistors, kept only 1 LED, add few caps and an opamp and put together a decent shunt type performer. Still without need to go DOE (Diy-Over-Engineering).
All parts available at Mouser for few $USD.

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they will drag you down to their level,
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MystereoN

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Re: "Stimpy Shunt" regulator
« Reply #7 on: July 27, 2011, 05:17:14 AM »
...for the sake of simplicity, even input LPF and CCS with it's heatsink can be deleted  :)

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Gen. Dreedle

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Re: "Stimpy Shunt" regulator
« Reply #8 on: July 27, 2011, 11:46:34 AM »
Is that layout supposed to mean something?

You are missing the point..............

It is 4 AM, you need to whip up a shunt reg, and you don't have any op-amps. Just a bag of LEDs and some other parts, that are fairly common.

Some of us don't believe in op-amps. And it was 4 AM.

So, there!
"Major Danby, sir."
"Danby. D-A-N-B-Y."
"Take him out and shoot him."
"Sir?"
"I said take him out and shoot him. Can't you hear?"

zinsula

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Re: "Stimpy Shunt" regulator
« Reply #9 on: July 27, 2011, 04:24:32 PM »
Something like that??



I like simple circuits, since I'm lazy. And too dumb to understand the complicated ones.

Gen. Dreedle

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Re: "Stimpy Shunt" regulator
« Reply #10 on: July 27, 2011, 05:43:55 PM »
Pretty much...........except no cap. It really was 4 AM, and I just needed something fairly constant, voltage-wise. It was close enough.

OK............worth measuring, to see how good/bad it really is? Of course, will only happen if I have nothing better to do.

At 4 AM.

Life of an insomniac.
"Major Danby, sir."
"Danby. D-A-N-B-Y."
"Take him out and shoot him."
"Sir?"
"I said take him out and shoot him. Can't you hear?"

MystereoN

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Re: "Stimpy Shunt" regulator
« Reply #11 on: July 27, 2011, 07:43:29 PM »
Sorry, I really missed the point...you have to work with limited parts supply and at 4 AM  :-\
I was thinking you want to build SOTA device with 2 PNP's, bunch of LED's and resistors... and proposed you another type of simple shunt reg with few exchanges.
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Gen. Dreedle

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Re: "Stimpy Shunt" regulator
« Reply #12 on: July 27, 2011, 08:24:33 PM »
C'mon.............dude...............you don't think I could come up with something more complex, and/or better performance?

OK, now that you got the point.................
"Major Danby, sir."
"Danby. D-A-N-B-Y."
"Take him out and shoot him."
"Sir?"
"I said take him out and shoot him. Can't you hear?"