Re: Colonel Mustard in the library with a lead pipe.
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 ..............

Hi Fred,Fred Dieckmann said:"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.
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 ..............

Attachments
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..........
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..........

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..........

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..........

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
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
Attachments
Re: Nope.........
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???
Fred Dieckmann said: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???
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.
.......... 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.

Re: Nope.........
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?
😉
Fred Dieckmann said: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?
😉
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
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
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/ednmag/archives/1997/010297/01di_02.htm
regards, jonathan carr
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/ednmag/archives/1997/010297/01di_02.htm
regards, jonathan carr
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 😉
I know that this thread is rather 'old' now... but I was wondering if something new came out... mostly on the L200 side 😉
L200...
Hi,
Has anyone tried the L200 reg in any diy projects? Does it indead improve on the performance of the LM3x7? Is there a negative version of the L200?
Thanks
God bless...
Mark
Hi,
Has anyone tried the L200 reg in any diy projects? Does it indead improve on the performance of the LM3x7? Is there a negative version of the L200?
Thanks
God bless...
Mark
any other improved Linear regs?
Hi,
So far no response on the L200 so is there anyone out there who has used another type of linear reg with lower noise and faster adjusting?
God bless...
Mark
Hi,
So far no response on the L200 so is there anyone out there who has used another type of linear reg with lower noise and faster adjusting?
God bless...
Mark
Regulators
Ive use the LT1964 and LT1962 as regulators.
They worked very very well.
I could barely see the noise on my scope's highest setting.
(More info here)
Here is the circuit:
Here is the single sided board I made (bottom view).
All hand soldered.
That is a dime, you see the devices are very tiny.
Ive use the LT1964 and LT1962 as regulators.
They worked very very well.
I could barely see the noise on my scope's highest setting.
(More info here)
Here is the circuit:
An externally hosted image should be here but it was not working when we last tested it.
Here is the single sided board I made (bottom view).
All hand soldered.
That is a dime, you see the devices are very tiny.
An externally hosted image should be here but it was not working when we last tested it.
TI TL783 a good option...
Hi,
After spending many hours online looking at data sheets, it looks to me that the Texas Instruments TL783 3terminal reg is a pretty good option.
-zener vref (lower noise than bandgap ref)
-line reg ~1-2us
-load reg ~20us
Any thoughts one else have thoughts on this?
God bless...
Mark
Hi,
After spending many hours online looking at data sheets, it looks to me that the Texas Instruments TL783 3terminal reg is a pretty good option.
-zener vref (lower noise than bandgap ref)
-line reg ~1-2us
-load reg ~20us
Any thoughts one else have thoughts on this?
God bless...
Mark
Improving LM3x7
Hi Fred,
luckily I found the thread about that subject and saw your worthy contribution, but somehow I get lost over several threads. Your post #34, is that the last word on this subject?
Can it be applied to the 3A and 5A LM-type also?
What, in your words, will be the exact improvements?
In all data sheet are shown the tracking preregulator. What excactly will happen there, and will that improve the LM3xx?
Since I could not write you an email, I hope you answer here, if you are not to tired to this endless discussion pro and con.
Thanks
Michael
Hi Fred,
luckily I found the thread about that subject and saw your worthy contribution, but somehow I get lost over several threads. Your post #34, is that the last word on this subject?
Can it be applied to the 3A and 5A LM-type also?
What, in your words, will be the exact improvements?
In all data sheet are shown the tracking preregulator. What excactly will happen there, and will that improve the LM3xx?
Since I could not write you an email, I hope you answer here, if you are not to tired to this endless discussion pro and con.
Thanks
Michael
Re: Improving LM3x7
The original thread is almost 3 years old now and Fred moved on a long time ago.
Michael Mik said:Hi Fred,
Since I could not write you an email, I hope you answer here, if you are not to tired to this endless discussion pro and con.
Thanks
Michael
The original thread is almost 3 years old now and Fred moved on a long time ago.
Since I am waiting out a blizzard -- was looking at this thread and had the TAA 2/95 article sitting in my lap:
An externally hosted image should be here but it was not working when we last tested it.
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