voltage regulator accuracy

On Thu, 25 Oct 2007 04:18:30 -0000, Isaac <isaacdover@gmail.com>
wrote:

I have a National Semiconductor Corp. "Voltage Regulator Handbook"
1982 it explains all you'd need. No ISBN number on the book.

A great resource for stuff like this is www.abebooks.com

They are an on-line association of bookstores throughout the US and
most of the English speaking world and then some. You can search on
Title, Author, Topic, and ISBN #

Many of the books are much less than the $3-4 shipping it takes to get
them . . . (Great if you're addicted to novels and would rather have a
hard cover for a dollar than a paperback for more)

But . . . they also have just about any and every electronics text you
can imagine. I love seeing how others solve circuit problems and love
the "Encyclopedia of Electronic Circuits series" but not the $20+
prices. I have eight of them and paid between $1-8 for them - earlier
ones are less expensive.

No financial interest in abe books, but I've used them for many years
now and am very satisfied. In the one or two instances where a wrong
book was shipped - I emailed them and the bookseller elected to refund
the entire cost and let me keep the book. Only downside is 3 weeks
shipping via book rate postage.

--

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http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
----= East and West-Coast Server Farms - Total Privacy via Encryption =----
 
Michael A. Terrell wrote:

Jamie wrote:

Michael A. Terrell wrote:


Jamie wrote:


Isaac wrote:



hi all, i'm teaching myself via books and online material just for the
fun of electronics... i have built from spare parts a simple +5v power
supply using an NTE 5v regulator... however, when i measure the
voltage output, it is at 4.91v... i also have a basic stamp board...
on the basic stamp board the voltage regulator is a precise 5v... is
this due to the manufacturing or possibly my design?... what will the
impact be on my projects if the voltage is slightly less than 5v?..

thanks!


nah, just cheap regulators NTE got their hands on that didn't pass the
precise 5 volts out test or drifted a bit.
It's close enough for what it was designed for. Most likely well with
in the limits of generic specs. Now if you were talking about mill specs
then, that could be an issue.



You obviously don't know the difference between a voltage regulator,
and a voltage reference.



Excuse me ?

You obviously don't know how to read and follow the thread?

Yes, I know what a voltage reference is which wasn't part of the
original post as a concern?

Should I start calling you Eeyore JR. ? That last remark resembles
kinship.

I hope you don't hang out with him at that Turkish bathe house
he adores so much.




You are the one damming NTE parts for being out of spec, without
checking the specs, donkey.


Ha, If you even knew how bad some of the NTE replacement parts are, you
Click to expand...
wouldn't be saying that.

I've had some much bad experience with incompatible parts, I will
go out of my way to not use them.

The fact that many of them are not physically compatible isn't so
much as an issue. Its when you're using parts that need to replace RF
components to find, the part given by NTE as a replacement is not even
close enough to get the unit useable let alone working enough to see if
there is indication of life.

Op-amp replacements that just simply do not meet the minimum
requirements of the component being replaced. Specialized IC's that do
not have all of their functions working etc..

Which reminds me of a horizontal sync driver chip replacement for a
Zenith TV a few years ago from NTE, it offset the picture because the
digital counter/scaler was incorrect. After trying 2 of them, I finally
got the original part number.
PLL's chips incorrectly supporting the programming lines.
R.F. power transistors BW way to low..

That's just the tip of the iceberg!.

I've been around this far too long, its old news to me.

There is nothing like putting in the real part from what
ever manufacturer happens to be making them.

Maybe you've had some bad experience in trying to resurrect or build
something using NTE parts and didn't even realize it might had not been
anything wrong in your work.



--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
 
Jamie wrote:
Michael A. Terrell wrote:

Jamie wrote:

Michael A. Terrell wrote:


Jamie wrote:


Isaac wrote:



hi all, i'm teaching myself via books and online material just for the
fun of electronics... i have built from spare parts a simple +5v power
supply using an NTE 5v regulator... however, when i measure the
voltage output, it is at 4.91v... i also have a basic stamp board...
on the basic stamp board the voltage regulator is a precise 5v... is
this due to the manufacturing or possibly my design?... what will the
impact be on my projects if the voltage is slightly less than 5v?..

thanks!


nah, just cheap regulators NTE got their hands on that didn't pass the
precise 5 volts out test or drifted a bit.
It's close enough for what it was designed for. Most likely well with
in the limits of generic specs. Now if you were talking about mill specs
then, that could be an issue.



You obviously don't know the difference between a voltage regulator,
and a voltage reference.



Excuse me ?

You obviously don't know how to read and follow the thread?

Yes, I know what a voltage reference is which wasn't part of the
original post as a concern?

Should I start calling you Eeyore JR. ? That last remark resembles
kinship.

I hope you don't hang out with him at that Turkish bathe house
he adores so much.




You are the one damming NTE parts for being out of spec, without
checking the specs, donkey.


Ha, If you even knew how bad some of the NTE replacement parts are, you
wouldn't be saying that.

I've had some much bad experience with incompatible parts, I will
go out of my way to not use them.

The fact that many of them are not physically compatible isn't so
much as an issue. Its when you're using parts that need to replace RF
components to find, the part given by NTE as a replacement is not even
close enough to get the unit useable let alone working enough to see if
there is indication of life.
Click to expand...

GEE, did you ever consider that some OEM part numbers are reused by
other companies? Use some common sense. I have worked up to KU band,
and repaired microwave equipment when no manuals or parts were
available, and little test equipment. If you KNOW WHAT YOU'RE DOING, it
isn't difficult.


Op-amp replacements that just simply do not meet the minimum
requirements of the component being replaced. Specialized IC's that do
not have all of their functions working etc..
Click to expand...

So you think NTE had a crappy ASIC chip designed as a replacement,
rather than buy a million form the OEM with their house number? What a
maroon.


Which reminds me of a horizontal sync driver chip replacement for a
Zenith TV a few years ago from NTE, it offset the picture because the
digital counter/scaler was incorrect. After trying 2 of them, I finally
got the original part number.
PLL's chips incorrectly supporting the programming lines.
R.F. power transistors BW way to low..

That's just the tip of the iceberg!.

I've been around this far too long, its old news to me.

There is nothing like putting in the real part from what
ever manufacturer happens to be making them.
Click to expand...

I guess that you have never heard of a manufacturer screening gumdrop
parts, and selecting the ones that work best for a particular circuit?
Some sort them into multiple grades, and assign different stock numbers,
for different applications.


Maybe you've had some bad experience in trying to resurrect or build
something using NTE parts and didn't even realize it might had not been
anything wrong in your work.
Click to expand...

No, I've used literally thousands of ECG and NTE replacement
semiconductors, and only had two bad parts. I have used replacement
semiconductors for over 40 years, and still have several hundred ECG and
NTE types in my personal stock. I started with the original RCA SK
series in the mid '60s, when the entire cross reference was a small wall
chart, about the size of the retail tube price sheets. OTOH, I HAVE
seen a lot of piss poor techs destroy piles of replacement
semiconductors by mishandling ESD sensitive components, and overheating
them by using the wrong soldering equipment. They also stuck a new
semiconductor into a piece of equipment without correcting the original
fault, or not paying attention and soldering the part in, in the wrong
orientation. My 40+ years of repairing electronics says that you are
wrong. of all the lines of replacement parts, the early GE was the
worst.

Over the past 40 years I've used:
RCA SK,
GE GE and GEIC,
MOTOROLA HEP,
WORKMAN,
DELCO DS and DM,
ZENITH,
SYLVANIA/PHILIPS ECG and NTE parts.

There were hundreds of bad GE parts, and less than a dozen of all the
other brands, combined. In those 40+ years I repaired consumer,
industrial, broadcast and high power audio equipment.

A poor workman blames his tools, rather than himself.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
 
On Thu, 25 Oct 2007 20:46:57 -0400, Jamie
<jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:

Michael A. Terrell wrote:

Jamie wrote:

Michael A. Terrell wrote:


Jamie wrote:


Michael A. Terrell wrote:



Jamie wrote:



Isaac wrote:




hi all, i'm teaching myself via books and online material just for the
fun of electronics... i have built from spare parts a simple +5v power
supply using an NTE 5v regulator... however, when i measure the
voltage output, it is at 4.91v... i also have a basic stamp board...
on the basic stamp board the voltage regulator is a precise 5v... is
this due to the manufacturing or possibly my design?... what will the
impact be on my projects if the voltage is slightly less than 5v?..

thanks!


nah, just cheap regulators NTE got their hands on that didn't pass the
precise 5 volts out test or drifted a bit.
It's close enough for what it was designed for. Most likely well with
in the limits of generic specs. Now if you were talking about mill specs
then, that could be an issue.



You obviously don't know the difference between a voltage regulator,
and a voltage reference.



Excuse me ?

You obviously don't know how to read and follow the thread?

Yes, I know what a voltage reference is which wasn't part of the
original post as a concern?

Should I start calling you Eeyore JR. ? That last remark resembles
kinship.

I hope you don't hang out with him at that Turkish bathe house
he adores so much.




You are the one damming NTE parts for being out of spec, without
checking the specs, donkey.



Ha, If you even knew how bad some of the NTE replacement parts are, you
wouldn't be saying that.

I've had some much bad experience with incompatible parts, I will
go out of my way to not use them.

The fact that many of them are not physically compatible isn't so
much as an issue. Its when you're using parts that need to replace RF
components to find, the part given by NTE as a replacement is not even
close enough to get the unit useable let alone working enough to see if
there is indication of life.



GEE, did you ever consider that some OEM part numbers are reused by
other companies? Use some common sense. I have worked up to KU band,
and repaired microwave equipment when no manuals or parts were
available, and little test equipment. If you KNOW WHAT YOU'RE DOING, it
isn't difficult.



Op-amp replacements that just simply do not meet the minimum
requirements of the component being replaced. Specialized IC's that do
not have all of their functions working etc..



So you think NTE had a crappy ASIC chip designed as a replacement,
rather than buy a million form the OEM with their house number? What a
maroon.



Which reminds me of a horizontal sync driver chip replacement for a
Zenith TV a few years ago from NTE, it offset the picture because the
digital counter/scaler was incorrect. After trying 2 of them, I finally
got the original part number.
PLL's chips incorrectly supporting the programming lines.
R.F. power transistors BW way to low..

That's just the tip of the iceberg!.

I've been around this far too long, its old news to me.

There is nothing like putting in the real part from what
ever manufacturer happens to be making them.



I guess that you have never heard of a manufacturer screening gumdrop
parts, and selecting the ones that work best for a particular circuit?
Some sort them into multiple grades, and assign different stock numbers,
for different applications.



Maybe you've had some bad experience in trying to resurrect or build
something using NTE parts and didn't even realize it might had not been
anything wrong in your work.



No, I've used literally thousands of ECG and NTE replacement
semiconductors, and only had two bad parts. I have used replacement
semiconductors for over 40 years, and still have several hundred ECG and
NTE types in my personal stock. I started with the original RCA SK
series in the mid '60s, when the entire cross reference was a small wall
chart, about the size of the retail tube price sheets. OTOH, I HAVE
seen a lot of piss poor techs destroy piles of replacement
semiconductors by mishandling ESD sensitive components, and overheating
them by using the wrong soldering equipment. They also stuck a new
semiconductor into a piece of equipment without correcting the original
fault, or not paying attention and soldering the part in, in the wrong
orientation. My 40+ years of repairing electronics says that you are
wrong. of all the lines of replacement parts, the early GE was the
worst.

Over the past 40 years I've used:
RCA SK,
GE GE and GEIC,
MOTOROLA HEP,
WORKMAN,
DELCO DS and DM,
ZENITH,
SYLVANIA/PHILIPS ECG and NTE parts.

There were hundreds of bad GE parts, and less than a dozen of all the
other brands, combined. In those 40+ years I repaired consumer,
industrial, broadcast and high power audio equipment.

A poor workman blames his tools, rather than himself.


I have a whole crap load of EGC, NTE, STK, HEP and lots of DELCO
parts that were given to me and some I simply refuse to use for anything
other than helping my friends repair some old crap and maybe ebaying
them. Want them?
I even have some original in package Germanium RCA transistors.
Click to expand...
---
If you have no other use for them and you want some extra cash you
might want to get in touch with some of the part miners.


--
JF
 
Michael A. Terrell wrote:

Jamie wrote:

Michael A. Terrell wrote:


Jamie wrote:


Michael A. Terrell wrote:



Jamie wrote:



Isaac wrote:




hi all, i'm teaching myself via books and online material just for the
fun of electronics... i have built from spare parts a simple +5v power
supply using an NTE 5v regulator... however, when i measure the
voltage output, it is at 4.91v... i also have a basic stamp board...
on the basic stamp board the voltage regulator is a precise 5v... is
this due to the manufacturing or possibly my design?... what will the
impact be on my projects if the voltage is slightly less than 5v?..

thanks!


nah, just cheap regulators NTE got their hands on that didn't pass the
precise 5 volts out test or drifted a bit.
It's close enough for what it was designed for. Most likely well with
in the limits of generic specs. Now if you were talking about mill specs
then, that could be an issue.



You obviously don't know the difference between a voltage regulator,
and a voltage reference.



Excuse me ?

You obviously don't know how to read and follow the thread?

Yes, I know what a voltage reference is which wasn't part of the
original post as a concern?

Should I start calling you Eeyore JR. ? That last remark resembles
kinship.

I hope you don't hang out with him at that Turkish bathe house
he adores so much.




You are the one damming NTE parts for being out of spec, without
checking the specs, donkey.



Ha, If you even knew how bad some of the NTE replacement parts are, you
wouldn't be saying that.

I've had some much bad experience with incompatible parts, I will
go out of my way to not use them.

The fact that many of them are not physically compatible isn't so
much as an issue. Its when you're using parts that need to replace RF
components to find, the part given by NTE as a replacement is not even
close enough to get the unit useable let alone working enough to see if
there is indication of life.



GEE, did you ever consider that some OEM part numbers are reused by
other companies? Use some common sense. I have worked up to KU band,
and repaired microwave equipment when no manuals or parts were
available, and little test equipment. If you KNOW WHAT YOU'RE DOING, it
isn't difficult.



Op-amp replacements that just simply do not meet the minimum
requirements of the component being replaced. Specialized IC's that do
not have all of their functions working etc..



So you think NTE had a crappy ASIC chip designed as a replacement,
rather than buy a million form the OEM with their house number? What a
maroon.



Which reminds me of a horizontal sync driver chip replacement for a
Zenith TV a few years ago from NTE, it offset the picture because the
digital counter/scaler was incorrect. After trying 2 of them, I finally
got the original part number.
PLL's chips incorrectly supporting the programming lines.
R.F. power transistors BW way to low..

That's just the tip of the iceberg!.

I've been around this far too long, its old news to me.

There is nothing like putting in the real part from what
ever manufacturer happens to be making them.



I guess that you have never heard of a manufacturer screening gumdrop
parts, and selecting the ones that work best for a particular circuit?
Some sort them into multiple grades, and assign different stock numbers,
for different applications.



Maybe you've had some bad experience in trying to resurrect or build
something using NTE parts and didn't even realize it might had not been
anything wrong in your work.



No, I've used literally thousands of ECG and NTE replacement
semiconductors, and only had two bad parts. I have used replacement
semiconductors for over 40 years, and still have several hundred ECG and
NTE types in my personal stock. I started with the original RCA SK
series in the mid '60s, when the entire cross reference was a small wall
chart, about the size of the retail tube price sheets. OTOH, I HAVE
seen a lot of piss poor techs destroy piles of replacement
semiconductors by mishandling ESD sensitive components, and overheating
them by using the wrong soldering equipment. They also stuck a new
semiconductor into a piece of equipment without correcting the original
fault, or not paying attention and soldering the part in, in the wrong
orientation. My 40+ years of repairing electronics says that you are
wrong. of all the lines of replacement parts, the early GE was the
worst.

Over the past 40 years I've used:
RCA SK,
GE GE and GEIC,
MOTOROLA HEP,
WORKMAN,
DELCO DS and DM,
ZENITH,
SYLVANIA/PHILIPS ECG and NTE parts.

There were hundreds of bad GE parts, and less than a dozen of all the
other brands, combined. In those 40+ years I repaired consumer,
industrial, broadcast and high power audio equipment.

A poor workman blames his tools, rather than himself.


I have a whole crap load of EGC, NTE, STK, HEP and lots of DELCO
Click to expand...
parts that were given to me and some I simply refuse to use for anything
other than helping my friends repair some old crap and maybe ebaying
them. Want them?
I even have some original in package Germanium RCA transistors.


--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
 
John Fields wrote:

On Thu, 25 Oct 2007 20:46:57 -0400, Jamie
jamie_ka1lpa_not_valid_after_ka1lpa_@charter.net> wrote:


Michael A. Terrell wrote:


Jamie wrote:


Michael A. Terrell wrote:



Jamie wrote:



Michael A. Terrell wrote:




Jamie wrote:




Isaac wrote:





hi all, i'm teaching myself via books and online material just for the
fun of electronics... i have built from spare parts a simple +5v power
supply using an NTE 5v regulator... however, when i measure the
voltage output, it is at 4.91v... i also have a basic stamp board...
on the basic stamp board the voltage regulator is a precise 5v... is
this due to the manufacturing or possibly my design?... what will the
impact be on my projects if the voltage is slightly less than 5v?..

thanks!


nah, just cheap regulators NTE got their hands on that didn't pass the
precise 5 volts out test or drifted a bit.
It's close enough for what it was designed for. Most likely well with
in the limits of generic specs. Now if you were talking about mill specs
then, that could be an issue.



You obviously don't know the difference between a voltage regulator,
and a voltage reference.



Excuse me ?

You obviously don't know how to read and follow the thread?

Yes, I know what a voltage reference is which wasn't part of the
original post as a concern?

Should I start calling you Eeyore JR. ? That last remark resembles
kinship.

I hope you don't hang out with him at that Turkish bathe house
he adores so much.




You are the one damming NTE parts for being out of spec, without
checking the specs, donkey.



Ha, If you even knew how bad some of the NTE replacement parts are, you
wouldn't be saying that.

I've had some much bad experience with incompatible parts, I will
go out of my way to not use them.

The fact that many of them are not physically compatible isn't so
much as an issue. Its when you're using parts that need to replace RF
components to find, the part given by NTE as a replacement is not even
close enough to get the unit useable let alone working enough to see if
there is indication of life.



GEE, did you ever consider that some OEM part numbers are reused by
other companies? Use some common sense. I have worked up to KU band,
and repaired microwave equipment when no manuals or parts were
available, and little test equipment. If you KNOW WHAT YOU'RE DOING, it
isn't difficult.




Op-amp replacements that just simply do not meet the minimum
requirements of the component being replaced. Specialized IC's that do
not have all of their functions working etc..



So you think NTE had a crappy ASIC chip designed as a replacement,
rather than buy a million form the OEM with their house number? What a
maroon.




Which reminds me of a horizontal sync driver chip replacement for a
Zenith TV a few years ago from NTE, it offset the picture because the
digital counter/scaler was incorrect. After trying 2 of them, I finally
got the original part number.
PLL's chips incorrectly supporting the programming lines.
R.F. power transistors BW way to low..

That's just the tip of the iceberg!.

I've been around this far too long, its old news to me.

There is nothing like putting in the real part from what
ever manufacturer happens to be making them.



I guess that you have never heard of a manufacturer screening gumdrop
parts, and selecting the ones that work best for a particular circuit?
Some sort them into multiple grades, and assign different stock numbers,
for different applications.




Maybe you've had some bad experience in trying to resurrect or build
something using NTE parts and didn't even realize it might had not been
anything wrong in your work.



No, I've used literally thousands of ECG and NTE replacement
semiconductors, and only had two bad parts. I have used replacement
semiconductors for over 40 years, and still have several hundred ECG and
NTE types in my personal stock. I started with the original RCA SK
series in the mid '60s, when the entire cross reference was a small wall
chart, about the size of the retail tube price sheets. OTOH, I HAVE
seen a lot of piss poor techs destroy piles of replacement
semiconductors by mishandling ESD sensitive components, and overheating
them by using the wrong soldering equipment. They also stuck a new
semiconductor into a piece of equipment without correcting the original
fault, or not paying attention and soldering the part in, in the wrong
orientation. My 40+ years of repairing electronics says that you are
wrong. of all the lines of replacement parts, the early GE was the
worst.

Over the past 40 years I've used:
RCA SK,
GE GE and GEIC,
MOTOROLA HEP,
WORKMAN,
DELCO DS and DM,
ZENITH,
SYLVANIA/PHILIPS ECG and NTE parts.

There were hundreds of bad GE parts, and less than a dozen of all the
other brands, combined. In those 40+ years I repaired consumer,
industrial, broadcast and high power audio equipment.

A poor workman blames his tools, rather than himself.



I have a whole crap load of EGC, NTE, STK, HEP and lots of DELCO
parts that were given to me and some I simply refuse to use for anything
other than helping my friends repair some old crap and maybe ebaying
them. Want them?
I even have some original in package Germanium RCA transistors.


---
If you have no other use for them and you want some extra cash you
might want to get in touch with some of the part miners.


Ok, well I guess I could do that. I do have lots of new in packaged
Click to expand...
older parts that were originally designated for replacement of OEM
line and original OEM parts.

Most of what I purchased my self over the years has been used how
ever, I have friends that like to clean out shops, warehouses, estates
and so on. I end up getting a variety of parts like this. Once in a
while I get an antique or something slightly in the solid state
era to resurrect for a favor or small fee. It's getting so
that now, my storage facilities (my basement) is getting crowded! :)

I'll keep your suggestions under advisement :)

Thanks.



--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5
 
On Tue, 23 Oct 2007 12:35:22 -0700 in sci.electronics.basics, Tim
Wescott <tim@seemywebsite.com> wrote,
NTE buys floor-sweepings from the semiconductor fabs, then marks them
with their own numbers.

_Any_ voltage regulator will be inaccurate. The more you spend, the
better accuracy you'll get.
Click to expand...
Bull! NTE charges more for regulators that are never better and
sometimes worse than you will get for less from many other suppliers.
Spending more for NTE guarantees nothing, and repeating the overpriced
vendor's old chestnut "you get what you pay for" accomplishes nothing.

>
 
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