Toshiba TV29C90 problem; Image fades to black...

[Dave D]

"Dave" <dspear99ca@yahoo.delete.com> wrote in message
news:EYVTf.6018$J43.3427@edtnps90...

"David C. Partridge" <afb12xwy@dialxwy.pipex.com> wrote in message
news:C8adnUQjLNMTur3ZRVnyuA@pipex.net...
I'd think that any PNP power xistor with an adequate voltage rating would
do - this is just a pass xistor wired as an EF isn't it?

David

I know very little of transistors other than their basic function, so I
don't know the answer to your question above.

As I noted, it's being used to (down)-regulate negative DC voltage. What
might the reason have been to opt for this transistor over a regulator?
There is a +5VDC regulator right next door in the same circuit.

Can I use the regulator in place of the transistor?

Maybe, maybe not. The 2V difference probably isn't critical, but we don't
know how much current is being drawn. The 7815 is only good for around an
amp with a big heatsink, (some variants 1.5 A), the 2SB527 is good for 2A.
You could try one and measure the current, I doubt the current draw will be
anywhere near 2A. You'll probably want a decent heatsink though, and to get
closer to 13V you could bung 3 series diodes in the output of the regulator
output to give 15-2.1=12.9V. Take care to use diodes rated higher than the
current though, 1n400x might not be adequate. Again, they're only good for 1
Amp.

As for a replacement transistor, just about any power transistor of similar
(or better) rating and similar physical size will do, it isn't critical in
this application. You could use something in a TO220 package like a TIP42c
which is a popular transistor here in the UK.

http://www.fairchildsemi.com/ds/TI%2FTIP42C.pdf

Dave

 

[Mr. Land]

The second waveform you linked to - with the diodes reattached and with
the resistive loads reapplied - does that include the filtering
circuitry in the schematic, too? (C1561-3, L1562)?

If so, maybe I'm misinterpreting what I'm seeing in the scope picture,
but that semi-square wave with the ringing on the leading edge has an
amplitude of over 17V P-P. That seems excessively high to me for a
rail that's supposed to be delivering +5V DC (especially given it's got
close to 1000 mfd filtering it).

Are you sure that there's not some kind of weird grounding problem
happening here?

 

[Dave]

"GregS" <szekeres@pitt.edu> wrote in message
news:dvpbm2$6up$3@usenet01.srv.cis.pitt.edu...

In article <6PVTf.106738$Mh4.79510@fe02.news.easynews.com>, "Travis
Jordan" <no.one@no.net> wrote:
Dave wrote:
I've identified a bad transistor in the power supply of an audio
component, circa 1981. It's a 2SB527 PNP transistor... I had a bit
of a look around on the net and didn't find any quick easy sources.

Xref:
http://www.st.com/stonline/books/pdf/docs/4171.pdf



2SB527 PS TO125 110 v 90v 5v 2A 10WT 50minHFE
Froms Towers Transistor Selector No freq. given.

That's odd... I am finding all over the place on the net:

2SB527 TO220 110V 100V 0A8 10W 50minHFE 300maxHFE

That's 800mA rated, not 2A. Where did you get 2A rating?

There is also some crosses at
http://www.ee.washington.edu/circuit_archive/parts/cross.html

Also my page.
http://www.pitt.edu/~szekeres/shopchip.htm

 

[Casual Fool]

Hi There Jane Doe, Downloadable full manuals for most every Simpson
meter can be found here> http://bama.sbc.edu/simpson.htm Best Luck,
Anthony, WB8MLA

 

On Apr 23, 9:43 am, "N Cook" <diver...@gazeta.pl> wrote:

I can understand the other way round being a no-no but what is wrong with
using switch mode power suply type electrolytics for mains smoothing of high
voltage rails.?

absolutely NO PROBLEM.
Usually the only time this kind of thing becomes an issue is if the
electrolytic is expected to handle and extreem amount of ripple such
as the rather physically big 4.7 uf @ 50V electrolytics used in some
monitor deflection circuits.... if you try to substitute an equal
value 4.7uf @ 50V normal size (much smaller) electrolytic it will
OVERHEAT and burst because the "power factor" rating of the smaller
cap is not adequate.
For what you described, I have used those kinds of electrolytics in 60
Hz filtering applications many times. NO PROBLEMS.
electricitym

 

[Malissa Baldwin]

On Apr 23, 10:00 am, Sitre Magana <sitremag...@yahoo.com> wrote:

On Apr 22, 11:09 am, mm <NOPSAMmm2...@bigfoot.com> wrote:

On Sun, 22 Apr 2007 01:41:58 -0400, mm <NOPSAMmm2...@bigfoot.com
trying to find something decent on the radio.

I can't find anything decent on the radio.
And you can't find anything to eat under 2000 calories per bite.

It too is usually mind
chatter, commercials and nothing other than Avril Lavinge, Kelly
Clarkson, Shania Twain and Lynyrd Skynyrd.
And what's your cupboards consist of doughnuts, Twinkies, Ho-Hos,

Oreos, Animal Crackers.

Even "commercial free" satellite radio has begun to add commercials
Satellite Radio has always had commercials like you always had

doughnuts in your fat face.

(Didn't cable TV do that in the '70s? Claim to be free of commercial interruption and then add commercials later on.)

No. Cable TV has had commercials for as long as you have been stuffing
your fat face with doughnuts, you cow.

I have a Sony Boombox with a cassette and CD player, and I always have either a tape or CD playing

And you always have doughnuts stuffed in your fat face.

never turning on the radio.
And never eating healthy foods.

 

[Malissa Baldwin]

On Apr 23, 9:53 am, Sitre Magana <sitremag...@yahoo.com> wrote:

On Apr 22, 12:46 am, Paul MR <pmr...@yahoo.com> wrote:> Terry wrote:
Some are a lot louder.

"Television is not a communications medium; it is an

advertising medium."

Pretty much. Even though cable was supposed to be commercial-free, in
the end, you end up paying to see new-commercials over the same old
shows and movies.

Even though your supposed to weigh 100 pounds, you end up paying to
stuff 500 calorie doughnuts in your fat face and in the end, you weigh
487 pounds.

 

[Ken G.]

Michael is a nice person you are mixed up somehow .

 

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[hallerb@aol.com]

Can someone who understands this clarify if a larger heater truly costs
more to operate than a smaller volume heater even if the efficiency factor
is the same?

Donna

no larger heater costs no more to heat the same amount of water.

if you call a real plumbing store AO SMITH sells a 96% efficent
condensing hot water tank but i dont know the cost.........

 

[hr(bob) hofmann@att.net]

On Feb 10, 9:38 pm, "Donna Ohl, Grady Volunteer Coordinator"
<donna....@sbcglobal.net> wrote:

On Sun, 10 Feb 2008 21:20:35 -0700, Rick Blaine wrote:
Hint: Direct energy cost is based on _use_ and efficiency, not _capacity_ and
efficiency.

Good point ... dead capacity vs active usage!

Darn. I wish I understood this EF thing better, especially given two
identical situations where the *only* difference is the CAPACITY.

Based on what you implied, if I inferred correctly, if the USAGE was
exactly the same for two water heaters with the same EF, then the costs to
operate a 50-gallon water heater would be EXACTLY the same as the costs to
operate a 100-gallon water heater (if the Efficiency Factor were the same
for both).

Did I understand the math (and your point) correctly?

Donna

Donna:

Get a heater with the same gallons as you currently have, and as high
an efficiency rating as possible, go for at least a 5-year warranty.
Get a unit that is exactly the same outside dimensions so the piping
does not have to be changed and find a reasonably handy neighbor to
put the new tank in. It should take less than 30 minutes to do the
entire switch-out if the old and new tanks are the exact same size.
Compare prices on a cost per year of warranty coverage, I have seen a
lot of heaters that go bad within a year or so of the expiration of
the warranty, so cost per year of coverage is a good comparison
criteria. If you have the room, adding a fibre-glass water heater
cover over the new tank will improve the heat loss and thus raise the
efficiency. Don't obcess(SP?) about this, it isn't worth the time and
effort.

H. R.(Bob) Hofmann

 

[N8N]

On Feb 11, 12:50 pm, "Donna Ohl, Grady Volunteer Coordinator"
<donna....@sbcglobal.net> wrote:

On Mon, 11 Feb 2008 07:24:20 GMT, James Sweet wrote:
I pay around $1.15 per therm,
I still remember when it was ... 33 cents.

I pay around $1.33 per therm.
I'm going to do the calculations today.

I just called Sears Kenmore (actually AO SMith State Industries makes all
the Kenmore brands) asking for their highest-efficiency consumer hot water
heater models.
- Sears Kenmore Home Water Heater Department: 1-800-877-6420

Here's the summary from Sears for the 40-gallon 12/1 year water heater:
- $420/$853 #33144 FHR 81 gallons, EF 0.63, BTU 40K,
- 58" tall, 20.5" diameter, 63.5" tall with diverter

Here's the summary from Sears for the 50-gallon 12/1 year water heater:
- $450/$885 #33154 FHR 97 gallons, EF 0.63, BTU 40K,
- 59.5" tall, 22" diameter, 65" tall with diverter

The installation fee includes a bunch of possibly mandatory extras.
- Mandatory Installation Fee $300
- Mandatory Disposal Fee $10
- Mandatory Plumbing Permit $77
- Mandatory Flex Pipe Replacement $46
- Mandatory Sales Tax on the water heater ~8.75%
- Possible Earthquake Straps  $68
- Possible pipe retrofit fees ~100
- Possible trip charge of $35 to $80 if any service is refused

I still have to do the calculations to see if the EF makes any real
difference at a cost per therm of $1.33 particularly since the "average"
water heater at HD was 0.58 or 0.59 EF, but I could special order a HD one
with 0.62 EF but I could get from Sears one with an EF of 0.63.

I wonder how much exactly it all matters ... for that ... I need to build
the calculations.

I think I have enough now - certainly more than I ever thought I needed to
know - to make a reasonable not-dumb decision on replacing my home water
heater that started leaking yesterday morning.

Please let me know if you have any calculators on the web which can COMPARE
two home water heaters given the specs we have posted in this thread!

Thanks,
Donna

If you plan on flushing the tank and inspecting the anode annually
from here on out, I would expect that the higher efficiency model will
be your better buy unless the price is *significantly* higher. Proper
maintenance could make the tank last 30 years or more, it's just that
few people actually do it.

I write the flush/inspection dates right on the side of the tank in
Sharpie, that reminds me when it's time to do it again.

nate

 

[hallerb@aol.com]

lets assume a 300 buck a year operating cost and it sounds like you
might save 4% on a more efficent model.

4% of $300 is $12 bucks a year, thats no biggie.

now the 90+ tanks might cut your water heating bill by nearly half,
but purchase cost will be a lot more

 

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On Feb 11, 10:53 pm, "Edwin Pawlowski" <e...@snet.net> wrote:

"Donna Ohl, Grady Volunteer Coordinator" <donna....@sbcglobal.net> wrote in
message



The installation fee includes a bunch of possibly mandatory extras.
- Mandatory Installation Fee $300
- Mandatory Disposal Fee $10
- Mandatory Plumbing Permit $77
- Mandatory Flex Pipe Replacement $46
- Mandatory Sales Tax on the water heater ~8.75%
- Possible Earthquake Straps  $68
- Possible pipe retrofit fees ~100
- Possible trip charge of $35 to $80 if any service is refused

Do you get a choice of KY or Vaseline too?

Call al local plumber and save a bundle of money.  The flex pipe should be
replaced with every installation though.

What on that list is so excessive or wouldn't incur a similar charge
from a local plumber? They all seem within reason, depending of
course on the area.

 

On Feb 12, 4:02 pm, "Edwin Pawlowski" <e...@snet.net> wrote:

trad...@optonline.net> wrote in message news:6fc777ee-3fad-467f-b11c-

The installation fee includes a bunch of possibly mandatory extras.
- Mandatory Installation Fee $300
- Mandatory Disposal Fee $10
- Mandatory Plumbing Permit $77
- Mandatory Flex Pipe Replacement $46
- Mandatory Sales Tax on the water heater ~8.75%
- Possible Earthquake Straps $68
- Possible pipe retrofit fees ~100
- Possible trip charge of $35 to $80 if any service is refused
What on that list is so excessive or wouldn't incur a similar charge
from a local plumber?    They all seem within reason, depending of
course on the area.

The total is in the $680 range for most options.

Install 300
Disposal 10
Permit 77
Flex Pipe 46

That's $433 plus tax for a straightforward typical job. You may be
able to get it done for less, but it's not an outrageous price either.

 Start with he basic $300

charge. Double what a local guy may charge.

$300 is a typical price here in NJ.


 Permits can very , but probably

closer to $25 if you actually get one.  I'd not get one.

Any decent licensed plumber is going to get a permit, if one is
required. It's not a customer option, either you need one or you
don't. Now $77 may be a bit high, but with the way all kinds of fees
and permit charges have been jacked up here and in many other parts of
the country, it wouldn't surprise me to find that it could cost that
much. How about the plumber's time in going and getting it?


What about that $80

trip charge?  Sears will hose you no matter what.  Last place I'd go.

What $80 trip charge? That was IF SERVICE IS REFUSED. Meaning they
make a wasted trip and are locked out, etc.

 

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On Feb 13, 6:14�am, "Only Just" <ifixit2@hotmail(dot)com> wrote:

"Donna Ohl, Grady Volunteer Coordinator" <donna....@sbcglobal.net> wrote in
messagenews6xsj.587$fX7.417@nlpi061.nbdc.sbc.com...





On Wed, 13 Feb 2008 06:16:38 GMT, Donna Ohl, Grady Volunteer Coordinator
wrote:
The math is all spelled out for us in the PDF at:
http://tinyurl.com/38eh4d
http://www.gamanet.org/gama/inforesources.nsf/vAttachmentLaunch/C2AAF...

Since almost all of us were dead wrong on this one, it would be nice if
someone can read that reference document and check my calculations

PLEASE DOUBLECHECK THESE HOT-WATER-HEATER CALCULATIONS!

Here are the necessary calculations I believe we need to make in order to
compare two gas-fired water heaters. All calculations are courtesy of the
referenced PDF and charts atwww.gamanet.orgexcept the energy costs which
are courtesy of PG&E athttp://www.pge.com/tariffs/pdf/G-1.pdf

In reality, these calculations would need to be done for at least a
half-dozen different water heaters (two each from Lowes, Sears, and Home
Depot, for example) in order to properly choose an available water heater
intelligently.

For simplicity, I'll use the values I plugged into the calculations for my
home; yours may differ but the mathematical approach is exactly the same..
0. Calculate minimum legal efficiency (EF)
1. Calculate maximum peak-hour requirements (FHR)
2. Calculate total installed price ($/installation)
3. Calculate yearly operating costs ($/year)
4. Calculate payback period (months/installation)

Here are my calculations.
PLEASE CHECK FOR ERRORS OR OMISSIONS AS WE ALL ARE LEARNING FROM THIS!

0. Calculate the minimum energy factor required by federal & local law:
(based on October 1990 Dept. of Energy Test Procedure for Water Heaters as
published in the May 11, 1998 Federal Register.)

For gas-fired residential water heaters, the minimum energy factor is:
Minimum EF for 40-gallon water heaters = 0.67 - 0.0019 * 40 = 0.58
Minimum EF for 50-gallon water heaters = 0.67 - 0.0019 * 50 = 0.59

Note: Southern California uses different legal minimum numbers than
northern California so be advised to modify the calculation for your area!

1. Determine your peak requirements:
20 gallons per shower x 2 showers in one hour = 40 gallons per hour
20 gallons per bath x 0 baths in one hour = 0 gallons per hour
2 gallons per shave x 0 shaves in that hour = 0 additional gallons
4 gallons per personal wash x 0 = 0 additional gallons
4 gallons per shampoo x 0 = 0 additional gallons (do it in the shower)
4 gallons per hand dishwashing x 0 dishes = 0 gallons
14 gallons per dishwasher load x 1 load = 14 additional peak gallons
5 gallons per food preparation x 1 meal = 5 additional gallons
26 gallons per wringer wash x 1 load = 26 additional peak gallons
32 gallons per automatic wash x 0 loads = 0 additional peak gallons
-----
TOTAL PEAK GALLONS = 40 + 14 + 5 + 26 = 85 gallons First Hour Rating

2. Determine price installed (inclusive):
Sears 33154 is $882 ($449 for the heater + $433 for full installation)
HD 183-717 is $747 ($349 for the heater + $398 for full installation)

3. Determine yearly operating costs given your basal energy unit, FHR, EF,
and average-use assumption.

For simplification, I'll only compare two heaters but the calculator we
create needs to cover at least a few at a time. I did this in Excel for
current northern California baseline (Schedule G-1 Residential Service)
energy rates.

CHOICE A:
Sears 33154 (marketed as Kenmore but made by AO Smith) FHR=97 EF=0.63
(41,045 btu/0.63)($1.21106/therm * 1 therm/100,000 btu) x 365 = $288/year

CHOICE B:
Home Depot 183-717 (marketed as GE but made by Rheem) FHR=80 EF=0.58
(41,045 btu/0.58)($1.21106/therm * 1 therm/100,000 btu) x 365 = $313/year

Note: Irrelevant specs would have been tank size, burner BTUs, gallons to
recovery to 90 degrees in one hour, etc. as the only figures that matter
for the calculations are the EF and the FHR since they take into account
all other design-size specifications such as those you quoted.)

4. Determine payback period:
a. Additional cost of more efficient model = $882 - $747 = $135
b. Annual savings of more efficient model = $313 - $288 = $25 per year
c. Payback period = $135 / $25 * 365 / 30 = �65 months (5.4 years)

5. Determine overall savings:
The two water heaters compared in this simplified calcuation would be
equivalent in overall costs at approximately 5 and a half years.

Considering the average water heater lasts 13 years, total savings for the
more expensive yet more economical heater would be:

(13 years - 5.4 years) * $25/year = $190 savings overall

6. Choose the correct water heater:

Based on the math everyone should perform when selecting the proper water
heater, I would buy the Sears 33154, which will save me almost 200 dollars
over its lifetime over the Home Depot 183-717 assuming current energy
prices and average usage.

Note: In reality, one needs to compare at least a half-dozen water
heaters;
here I only compared two for simplicity. I knew none of these calculations
just two days ago, so, PLEASE CHECK MY NUMBERS after reading the reference
document I refer to.

If the numbers hold water, then this should go into the alt.home.repair
FAQ
for everyone to benefit from all our efforts to understand how to properly
size & select a home water heater replacement (yes, I know there are
physical size issues also but this tutorial is already too long to go into
those details).

Donna

This is all very good but can you trust the figures given by the
manufacturers as these are often derived by engineer calculations and
marketing guru's and are manipulated to suit their agenda.
an example of this is how many people ever get the rated fuel consumption as
stated by any vehicle manufacturers, also appliance manufactures have
devised ways of confusing the figures to get a better rating that it
actually uses. The best way to purchase the water system is to get one that
suits your requirements as in size and water capacity.
Justy.- Hide quoted text -

- Show quoted text -

bottom line provided you buy a large enough heater the other
differences are minor,

operating costs warranty etc,

over the life of the heater, they in any form arent deal breakers. a
little shorter life, a little more cost, and as the last poster
pointed out manufacturers massage numbers, to make themselves look
good. small differences dont matter much

as long as you buy a decent tank you will be satisfied.

The FHR is largely dependent on burner size. the 75K BTU tanks cost
more but in the end what everyone wants is enough hot water. no
running out please......