sci.electronics.repair@googlegroups.com

Today's topics:

* Zeners in series - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/aac92dec501a08cb?hl=en
* From PATA/IDE To SATA I To SATA III, So What Is Next - Faster Throughput,
Smaller Interface, Lower $ - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/5da6d2bade54f5dc?hl=en
* we can supply all fashion brands' sunglasses such as Ray Ban sunglasses. - 1
messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/179163b739f17999?hl=en
* Need to buy a long Phillips no. 1 screwdriver - 3 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/105a0819a4728e8c?hl=en
* Chocalate Classic Tall UGG 5815 is Good quality and Bestsellers - 1 messages,
1 author
http://groups.google.com/group/sci.electronics.repair/t/793027c7938d336e?hl=en
* Choo,Dooney&Bourke,D&G,Burberry,LV,hermes,juicy,chanel,coach,chloe,Gucci,
Fendi,Dior,Prada,chanel wholesale - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/30958371f09dac41?hl=en
* Honeywell thermostat - 3 messages, 3 authors
http://groups.google.com/group/sci.electronics.repair/t/a07d59b9ba3e8fe1?hl=en

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TOPIC: Zeners in series
http://groups.google.com/group/sci.electronics.repair/t/aac92dec501a08cb?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Oct 29 2010 4:25 pm
From: who where

On Fri, 29 Oct 2010 10:42:09 -0700, David Nebenzahl
<nobody@but.us.chickens> wrote:

>On 10/28/2010 10:10 PM Steve Kraus spake thus:
>
>> Just wanted to be sure of this. If you connect two zeners in series with
>> the same polarity the effect is the same as having one zener of the sum of
>> the two voltages, right?
>
>Done all the time (2 or more diodes in series). You can even take
>intermediate voltages from taps in a series string of zeners.

and you can tweak the overall tempco by selection of the elements to
combine.

==============================================================================
TOPIC: From PATA/IDE To SATA I To SATA III, So What Is Next - Faster
Throughput, Smaller Interface, Lower $
http://groups.google.com/group/sci.electronics.repair/t/5da6d2bade54f5dc?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Oct 29 2010 4:45 pm
From: "takveen@gmail.com"

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TOPIC: we can supply all fashion brands' sunglasses such as Ray Ban sunglasses.

http://groups.google.com/group/sci.electronics.repair/t/179163b739f17999?hl=en
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TOPIC: Need to buy a long Phillips no. 1 screwdriver
http://groups.google.com/group/sci.electronics.repair/t/105a0819a4728e8c?hl=en
==============================================================================

== 1 of 3 ==
Date: Fri, Oct 29 2010 5:37 pm
From: whit3rd

On Oct 28, 10:28 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
wrote:
> mm wrote:
>
> > I need to buy a long Phillips no. 1 screwdriver.

>    You can always file a #2 down if you're desperate.

If you could really make a #2 into a #1 by filing, you could resharpen
the old
#1 easier. The only hand-grind screwdriver tip that fits a #1
Philips
is a flat-blade screwdriver with a V grind and the 'right' taper and
blunted
tip. And, that only hits two of the four flutes.

#2 has no two surfaces close enough together to fit into the recess of
most
#1 fasteners. It bends the metal of either the screw or the driver
if you
force it.

== 2 of 3 ==
Date: Fri, Oct 29 2010 6:21 pm
From: "Michael A. Terrell"

whit3rd wrote:
>
> On Oct 28, 10:28 pm, "Michael A. Terrell" <mike.terr...@earthlink.net>
> wrote:
> > mm wrote:
> >
> > > I need to buy a long Phillips no. 1 screwdriver.
>
> > You can always file a #2 down if you're desperate.
>
> If you could really make a #2 into a #1 by filing, you could resharpen
> the old #1 easier. The only hand-grind screwdriver tip that fits a
> #1 Philips is a flat-blade screwdriver with a V grind and the 'right'
> taper and blunted tip. And, that only hits two of the four flutes.

Then you need more practice with a file and the right steel rod.
Drill rod is soft and fairly easy to work with. Do you really believe
that the first Philips screwdrivers were turned out on CNC machines? :)

> #2 has no two surfaces close enough together to fit into the recess of
> most #1 fasteners.

Obviously. That's why you file off the excess metal. Then use a
torch to heat the tip to harden it. Unless it is a low torque driver
that needs to remain flexible. I still have a 30+ year old 36" long
1/8" flexible flat blade screwdriver I made to service Zenith tube type
TVs where the chassis sat way back form the front of the cabinet. Since
it was made to adjust pots it has no handle. it slips between your
fingers when you hit the stops at either end of the rotation.

> It bends the metal of either the screw or the driver
> if you force it.

I've made Philips screwdrivers out of drill rod with nothing more
than a file and a drill vise. File, test it, and file some more till it
fits. Then you can heat threat it to keep it from wearing out in a
hurry. Not for every tool in your toolbox, but sometimes making a
custom tool is the only way to get what you need. I started doing this
almost 50 years ago.

I've also taken screwdrivers with chips in the blade and reworked them
when I had nothing else available. You should have seen what few tools
I had to work with at a military TV station in Alaska in the '70s. I
even made a replacement tuner for our RCA Demod. The original Sarks
Tarzan tuner was missing parts and no factory replacement was
available. We were quoted $750 and 18 months for repair if we shipped
the equipment to RCA's broadcast division. I dug up a similar model
from a scrapped Motorola portable TV on its way to the base landfill.
Then I made a set of new, shorter shafts and converted it from series to
parallel filament. The last step was to remove the part number label
and put it on the replacement tuner. When the Army heard about it, they
were going to court martial for 'Cannibalization of US Property' me but
they couldn't prove I had done anything. It looked exactly like the
photos in the manuals, and had the right part number. A good set of
files and some patience was part of machinist training for generations.

--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

== 3 of 3 ==
Date: Fri, Oct 29 2010 7:03 pm
From: Jeff Liebermann

On Thu, 28 Oct 2010 23:13:33 -0400, mm <NOPSAMmm2005@bigfoot.com>
wrote:

>I've had one for almost 30 years, and I finally ruined it, taking out
>a screw that was in tightly.

Fix it by re-filing the tip.

"How to File Down a Stripped Phillips Head Screwdriver"
<http://www.doityourself.com/stry/how-to-file-down-a-stripped-phillips-head-screwdriver>
It's much easier to do with a #2 Phillips, but can be done with
practice to a #1 tip.

It might also be helpful to grind down the pointy tip a little:
<http://www.instructables.com/id/Enhance-the-functionality-of-many-screwdrivers./>

--
# Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
# 831-336-2558
# http://802.11junk.com jeffl@cruzio.com
# http://www.LearnByDestroying.com AE6KS

==============================================================================
TOPIC: Chocalate Classic Tall UGG 5815 is Good quality and Bestsellers
http://groups.google.com/group/sci.electronics.repair/t/793027c7938d336e?hl=en
==============================================================================

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==============================================================================
TOPIC: Honeywell thermostat
http://groups.google.com/group/sci.electronics.repair/t/a07d59b9ba3e8fe1?hl=en
==============================================================================

== 1 of 3 ==
Date: Fri, Oct 29 2010 8:16 pm
From: LSMFT

This thermostat I have has a mechanical relay. But.... When closed is a
closed circuit or dead short, fine that works for me. BUT when it's open
it still has 20 ohms and will not shut off a circulator. Why in hell do
they make it have 20 ohms when it's open?????? It should be infinity.

--
LSMFT

Simple job, assist the assistant of the physicist.

== 2 of 3 ==
Date: Fri, Oct 29 2010 8:35 pm
From: "Michael A. Terrell"

LSMFT wrote:
>
> This thermostat I have has a mechanical relay. But.... When closed is a
> closed circuit or dead short, fine that works for me. BUT when it's open
> it still has 20 ohms and will not shut off a circulator. Why in hell do
> they make it have 20 ohms when it's open?????? It should be infinity.

Not if you want the anticipator to work.

--
Politicians should only get paid if the budget is balanced, and there is
enough left over to pay them.

== 3 of 3 ==
Date: Fri, Oct 29 2010 10:34 pm
From: dplatt@radagast.org (Dave Platt)

>This thermostat I have has a mechanical relay. But.... When closed is a
>closed circuit or dead short, fine that works for me. BUT when it's open
>it still has 20 ohms and will not shut off a circulator. Why in hell do
>they make it have 20 ohms when it's open?????? It should be infinity.

I suspect that might be the resistance of the "anticipator"... a small
built-in heater, which is normally energized when the furnace is
running. The heat it generates, helps cancel out the effect of
thermal lag (i.e. the room air heats up faster than the bulky
thermostat does) and improves the ability of the thermostat to maintain
good temperature control.

--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

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