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Old 12th May 2004, 08:00 AM   #81
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Default Re: Colonel Mustard in the library with a lead pipe.

Quote:
Originally posted by Fred Dieckmann
"Fred, Any clue which regulator you are eyeballing?"

Yes I am pretty sure I know what they are...... I did have to order them after all. A clue heh ?

"What speaks with one voice, yet walks on four feet in the morning, two feet at noon and three feet in the evening?" Wait a minute, that's not it!


Alright, alright ............. It has more legs than a cow but fewer legs than a spider.
Hi Fred,
Let's see, a cow has four legs and a spider eight if I am not mistaken.
So your eyeballed reguator has >4 and <8 legs leaving 5, 6, or 7 possible legs. My best guess is 5 legs (SOT23-5). I already tried them and ..............
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Old 12th May 2004, 05:45 PM   #82
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Smile Sarasvati

Hi,
I case you wonder who the four-armed lady is; she is Sarasvati, the Goddess of learning and all the creative Arts.
The forum could embrace her as a mascot. What do I say, we should..........
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Old 12th May 2004, 05:54 PM   #83
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Smile Re: Sarasvati

Hi,
I did not know I could write in Greec characters. I will try again.

I case you wonder who the four-armed lady is; she is Sarasvati, the Goddess of learning and all the creative Arts.
The forum could embrace her as a mascot. What do I say, we should..........

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Old 12th May 2004, 05:56 PM   #84
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Default Nope.........

Small package voltage regulators usually have higher output impedances than something like a TO220 since they don't have good enough power dissapation and usually a smaller pass transistor.

Now there are some 5 legged TO220 package (like those used on some of the chip amps) regulators like the following:
LT 1185
LT 1067
LT 1528
LT1529
LT 1129
LT1087
LT1085
LT 1185

And even 7 legs like the LT1058.

Of course it may not be any of these part numbers and something completely different
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Old 12th May 2004, 06:02 PM   #85
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Default Re: Nope.........

Quote:
Originally posted by Fred Dieckmann
Small package voltage regulators usually have higher output impedances than something like a TO220 since they don't have good enough power dissapation and usually a smaller pass transistor.

Now there are some 5 legged TO220 package (like those used on some of the chip amps) regulators like the following:
LT 1185
LT 1067
LT 1528
LT1529
LT 1129
LT1087
LT1085
LT 1185

And even 7 legs like the LT1058.

Of course it may not be any of these part numbers and something completely different
Fred I hope these (I mean the regulators your are targetting) are not a monstrosity as that picture by Dika Wolf......Did I say we need low output impedance???
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Old 12th May 2004, 06:12 PM   #86
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Default Did I say we need low output impedance???

.......... and very good PSRR, low noise, and good sonics. Yes I think I know what the requirements are.

I had several better picures but those female centaurs seem to have an aversion to covering up thier breast.
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Old 13th May 2004, 09:36 AM   #87
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Wink Re: Nope.........

Quote:
Originally posted by Fred Dieckmann
Small package voltage regulators usually have higher output impedances than something like a TO220 since they don't have good enough power dissapation and usually a smaller pass transistor.

Now there are some 5 legged TO220 package (like those used on some of the chip amps) regulators like the following:
LT 1185
LT 1067
LT 1528
LT1529
LT 1129
LT1087
LT1085
LT 1185

And even 7 legs like the LT1058.

Of course it may not be any of these part numbers and something completely different
Hi Fred,
Your listing is quite funny as you mention the LT1185 twice.
Also the LT1067 and LT1058 are not regulators, and the LT1087 is obsolete.
Even more funny is this quote from the LT1185 datasheet: (yes I read these, even spell them)
"The LT1185 has a collector output NPN pass transistor,
which makes the open-loop output impedance much
higher than an emitter follower."

How about the low noise LT1764?

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Old 13th May 2004, 11:53 AM   #88
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Default External NFB loop ... TO220 ... 5 Legs

Settle for SGS - Thomson L200?

A designer's guide to ....
http://www.st.com/stonline/books/pdf/docs/1678.pdf

Datasheet
http://www.st.com/stonline/books/pdf/docs/1318.pdf
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Old 4th June 2004, 04:27 AM   #89
jcarr is offline jcarr  United States
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Location: Tokyo, Japan
I imagine that the following query will depart from the scope of this thread so far, but has anyone tried 5-pin adjustable monolithic voltage regulators such as National Semiconductor's LM2941 (positive) and LM2991 (negative), or Linear Technology's LT1129 (positive) and LT1185 (negative)? (The SGS Thomson L200 appears to not have any negative complementary device.) Do these 5-pin devices provide real-world measured or subjective benefits beyond the more common 3-pin monolithic regulators?

And to be more cheeky, has anyone compared the measurements and/or sound of the National Semis against the Linear Techs?

Comments, insights or subjective impressions all welcome.

Bonus: interesting power supply circuit - "Active preloading provides current sinking capability"

http://www.reed-electronics.com/ednm...97/01di_02.htm

regards, jonathan carr
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Old 9th July 2005, 09:43 AM   #90
r_jik45 is offline r_jik45  Japan
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Hi all,

I know that this thread is rather 'old' now... but I was wondering if something new came out... mostly on the L200 side
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