Digest for sci.electronics.repair@googlegroups.com - 25 updates in 7 topics

Lucifer <LuciferMorningstar@bigpond.com>: Apr 16 04:26PM +1000

On Fri, 05 Apr 2019 09:16:02 -0700, Jeff Liebermann <jeffl@cruzio.com>
wrote:
 
>battery. Is this what the former owner has done? If so, you will
>need a much better LiIon battery charger designed specifically to
>charge a LiIon battery.
 
I bought a new NiMH battery for my RC car.
7.2 volts 3500 mah. Would it do any harm to try to charge it
with a small plug pack charger made for use with NICAD?
Lucifer <LuciferMorningstar@bigpond.com>: Apr 16 04:29PM +1000


>Battery failure leaves them with a residual value of zero. You could
>cobble a battery pack together from other dead packs, putting
>test-good cells together, but once one cell dies the others follow.
 
I was given some battery packs from medical equipment.
I used the good cells to power a pocket TV.
 
Lucifer <LuciferMorningstar@bigpond.com>: Apr 16 04:35PM +1000

On Sat, 06 Apr 2019 15:29:38 -0700, Jeff Liebermann <jeffl@cruzio.com>
wrote:
 
>lithium ion batteries. I have a modest collection of DeWalt cordless
>tools that run on LiIon batteries. I don't own one (yet), but you can
>get just about any power tool with LiIon battery power.
 
You say you have a modest collection of DeWalt cordless
tools that run on LiIon batteries, but you don't own one (yet).
 
tabbypurr@gmail.com: Apr 15 11:57PM -0700

On Tuesday, 16 April 2019 07:26:25 UTC+1, Lucifer wrote:
 
> I bought a new NiMH battery for my RC car.
> 7.2 volts 3500 mah. Would it do any harm to try to charge it
> with a small plug pack charger made for use with NICAD?
 
No problem. Just unplug it when it's had it's charge time, NiCd chargers can't be counted on to shut off.
 
 
NT
Fox's Mercantile <jdangus@att.net>: Apr 15 10:07PM -0500

On 4/14/19 12:06 AM, Michael Terrell wrote:
> Continuing to post under the name of a business that
> you ran into the ground years ago makes you look like
> a super genius?
 
Uh huh, another one of your fantasies.
Fox's Mercantile is alive and well in Ranger Texas.
 
 
 
--
"I am a river to my people."
Jeff-1.0
WA6FWi
http:foxsmercantile.com
Michael Terrell <terrell.michael.a@gmail.com>: Apr 15 08:25PM -0700

On Monday, April 15, 2019 at 10:58:45 PM UTC-4, Paul Drahn wrote:
 
> But there are still low power analog TV stations still on the air, or
> were on the air. One here in Central Oregon. All religious broadcasting.
 
 
Do they transmit in stereo? Most LPTV stations operate on a shoestring, and adding the extra equipment for stereo wasn't cheap. The ones that I've seen recorded programs from Satellite, to video tape or a hard drive for later playback. What coverage are do they have with under 500W, and typically a tower under 100'?
 
The only station I worked at that was BTSC was a 5 MW EIRP
site with a 1700' tower that covered about 1/3 of Florida and occasionally received reports of being picked up in Texas during high sunspot cycles.
 
I have already stated that a few LPTV stations still exist, but many became sub channels after the conversion to digital.
tubeguy@myshop.com: Apr 15 11:50PM -0500

>Altec Lansing that consists of a sub woofer and two satellite speakers,
>that does a fine job.
 
> Mikek
 
Altec Lansing is some of the tops in electronics. I have one of their
commercial power amps.
 
But I imagine you paid dearly for those speakers.
 
I have some very nice bookshelf speakers that I use with this tv
receiver box. Before that, I had a small radio receiver I used for an
amp, but that goofy thing would turn itself on and off. Being built with
ICs, I just tossed it. Working on IC stuff is not my cup of tea.
 
Its easier to just watch for receivers at rummage sales and Goodwill.
 
My "real" stereo is 1200 watts, but for using my bedroom computer, all I
need is 10 watts. Not to mention that I download videos. The sound on
them is so varied that I'd blow my ears out on the big stereo.
tubeguy@myshop.com: Apr 15 11:56PM -0500


>OP
 
>NO your analog receiver cannot receive the audio portion of a digital TV transmission.
 
>m
 
Yep, I pretty much know that now. I'm tempted to retune it to see how
far I can get ch6 into the FM band. But I got plenty of FM radios so why
bother....
Lucifer <LuciferMorningstar@bigpond.com>: Apr 16 04:44PM +1000

On Mon, 15 Apr 2019 17:47:31 -0700 (PDT), Michael Terrell
>> input. Sounds a lot better than those so called (crap) "amplified
>> computer speakers".
 
>This has nothing to do with your original question, it is trolling.
 
When I worked as a telephone exchange tech I listened to a
radio I put together from bits found in a rubbish bin.
I could listen to AM radio and VHF TV sound and it ran off
the 50 volts from the rack battery jack.
Lucifer <LuciferMorningstar@bigpond.com>: Apr 16 04:49PM +1000


> Not all amplified computer speakers are crap, I have a set made by
>Altec Lansing that consists of a sub woofer and two satellite speakers,
>that does a fine job.
 
I had something similar and it was great. I put the satellite speakers
either side of the monitor and the stereo effect was fantastic.
I used it with my VCR which had a stereo decoder.
 
Lucifer <LuciferMorningstar@bigpond.com>: Apr 16 04:50PM +1000


>There are only two suitable candidates. Mickey Mouse and Donald Duck.
>Although I think my dog would do a better job than any president we've
>had in the last half century. He belongs to the K9 party. VOTE FOR HIM!
 
Your current president trumps them all.
Lucifer <LuciferMorningstar@bigpond.com>: Apr 16 04:52PM +1000

On Mon, 15 Apr 2019 21:11:51 -0500, Fox's Mercantile <jdangus@att.net>
wrote:
 
>> Fucking politics...... Not worth discussing since ALL politicians are
>> crooked liars. Dont matter what party they support.
 
>Which just goes to show you how ignorant you are.
 
I'd have to say you are ignorant. There is no 15th month.
Clifford Heath <no.spam@please.net>: Apr 16 04:56PM +1000

>> Altec Lansing that consists of a sub woofer and two satellite speakers,
>> that does a fine job.
> Altec Lansing is some of the tops in electronics.
 
They used to be where you come from (the 1970s). In the 1990s they also
made mass-market computer speakers, which do sound pretty good, but are
no comparison to their audiophile stuff. I have a revamped pair of their
"Eight" speakers, with the piezo and mid drivers replaced by modern
Kevlar units, and they sound fantastic.
 
> But I imagine you paid dearly for those speakers.
 
I bought three sets of their computer speakers for the family, and still
use one. I recall them being about $AU120 per set. They made even
bigger, better ones too, my son bought a set, internally multi-amp'ed.
 
Clifford Heath.
Lucifer <LuciferMorningstar@bigpond.com>: Apr 16 04:57PM +1000

>average $1,400 per household, rolling back regulations,
>and a few from a liberal website.
 
>?Move the U.S. Embassy in Israel to Jerusalem.
 
I say take off and nuke Israel from orbit.
 
 
>?Begin a dialogue with North Korea about ending its nuclear weapons
>program.
 
>OK, I got carried away, but do you agree with any of these accomplishments.
 
I'm glad Trump got in.
 
Spare Change <noncompliant@notcompliant.zgq>: Apr 15 08:53PM -0700

On Apr 13, 2019, tubeguy@myshop.com wrote
> lot of tube gear.
 
> Personally, I cant see that thick insulation failing at 500v or so, but
> it is a concern.
 
Look for MTW wire ("Machine Tool Wiring"). It has high strand count,
finer strands. Most sizes have 19 or greater strands. Easy to bend.
 
It's commonly found in marine supply stores because it's used in boats.
 
600 volt rated.
tabbypurr@gmail.com: Apr 15 09:08PM -0700

On Tuesday, 16 April 2019 04:53:37 UTC+1, Spare Change wrote:
> finer strands. Most sizes have 19 or greater strands. Easy to bend.
 
> It's commonly found in marine supply stores because it's used in boats.
 
> 600 volt rated.
 
why would you need the extra flexibility in valve gear?
And for someone just doing a bit as a hobby, can't enough be salvaged from junk?
 
 
NT
tubeguy@myshop.com: Apr 15 11:38PM -0500

On Mon, 15 Apr 2019 20:53:34 -0700, Spare Change
>finer strands. Most sizes have 19 or greater strands. Easy to bend.
 
>It's commonly found in marine supply stores because it's used in boats.
 
>600 volt rated.
 
That sounds promising. I know of a marine / boating store not too far
away too.
Hugh Byrne <HBHughHBByrneHB@eircom.ie>: Apr 10 06:00AM

Today the car wouldn't start at a friend's house who had no jumper cables.
He had some electrical wire though.
We were just starting to jury rig something when his wife showed up with
cables in her trunk.
 
If we did jury rig electrical wires, we were unsure of what size would
work.
 
How can we determine what size electrical wire would work to jump a typical
sedan in an emergency?
Stephen Wolstenholme <steve@easynn.com>: Apr 11 11:40AM +0100


>You can also get enough charge into a car battery with a set of AA cells, according to youtube.
 
That depends on the size of the "set"
 
--
http://www.npsnn.com
gregz <zekor@comcast.net>: Apr 10 08:04AM

> work.
 
> How can we determine what size electrical wire would work to jump a typical
> sedan in an emergency?
 
Aside from calculations, depends how long you wait to start as it charges,
and condition of battery being driven.
 
Greg
Chuck <ch@dejanews.net>: Apr 09 11:20AM -0500

On Mon, 8 Apr 2019 13:22:09 -0700 (PDT), captainvideo462009@gmail.com
wrote:
 
>same problem and I'm not sure what I'm going to do. If anyone can
>please help me with this I would sincerely appreciate it. Thanks,
>Lenny
Lenny,
Once you recap these and replace the mosfet, please check the 18V
zener to ground on the 15V line. Very likely that it will be shorted.
Chuck
Lucifer <LuciferMorningstar@bigpond.com>: Apr 11 07:25PM +1000

>>> I have 4 of these that we still use here in the house. Last year we
>>> were operating on generator power after a storm, The generator started
>>> surging as it began to run out of gas
 
Were you able to switch back to petrol to keep it going?
 
>a different Pana supply that had crowbar protection on the 15V line. I
>would guess that IC1001 is bad and I don't know of any kit that is
>available. Chuck
 
Sounds like he needs surge protection or a UPS.
 
Some early generators will interact with switch mode power
supplies causing them to surge.
Chuck <ch@dejanews.net>: Apr 10 12:58PM -0500

On Tue, 9 Apr 2019 10:58:05 -0700 (PDT), captainvideo462009@gmail.com
wrote:
 
>> Lenny
 
>Chuck
>In looking at the schematic I don't see an 18V line. At the output there is a plug. It has outputs of 4.0V, 6.0V, and 14.60V, but nothing marked 18V. Actually, the only zener I see on the board is D1018 and it is off the emitter of Q1006. Could that be the one you're referring to? Also I heard that some parts stores were selling repair kits for these but that was a while ago. Do you know who might still have these available or at least where I could still get the Mosfet? Thanks, Lenny
 
Lenny
Though I worked on many of these units, I confused this P Supply with
a different Pana supply that had crowbar protection on the 15V line. I
would guess that IC1001 is bad and I don't know of any kit that is
available. Chuck
tubeguy@myshop.com: Apr 09 06:27PM -0500

Back in the early days of electronics, Capacitors were called
Condensers. Why was the word changed?
 
Yea, I know there is a part in a refrigeration unit called a condenser.
But does that have anything to do with this?
tubeguy@myshop.com: Apr 09 06:26PM -0500

I have an antique tube type radio (FM tuner) from 1947. It's a
"Pilotuner" model 601. It has a #47 bulb for the dial light. The socket
is one of the kinds that you squeeze the sides and it clamps into the
front dial plate. The bulb is a bayonet type, so there is a spring below
the bulb base.
 
Of all the years I've worked on old tube gear, I never had this happen.
I removed the bulb and the wire fell out the rear of the socket. I'm
sure finding a replacement socket wont be easy, so I'm trying to repair
this broken one. From what I see, that wire is soldered into the center
of the insulated piece below the bulb. (I think???). But getting a
soldering iron into that small hole along with a solder sucker to remove
the old solder seems to be a big challenge. Not to mention how much heat
that tiny insulated piece can handle. Taking it apart by the spring is
not an option since they pressed the metal inward and I wont even
attempt to mess with that.
 
Have any of you successfully repaired one of these?
Any suggestions or tips appreciated.
 
If nothing else, I suppose I can epoxy a plain socket to that clamp.
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