sci.electronics.repair - 25 new messages in 8 topics - digest

sci.electronics.repair
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Today's topics:

==============================================================================
TOPIC: Annoying Clock on Microwave
http://groups.google.com/group/sci.electronics.repair/t/408849711f765a28?hl=en
==============================================================================

== 1 of 1 ==
Date: Fri, Apr 29 2011 10:15 pm
From: KR

On Apr 29, 3:28 am, josephkk <joseph_barr...@sbcglobal.net> wrote:
> On Wed, 27 Apr 2011 06:50:05 -0700 (PDT), KR <kenreed1...@gmail.com>
> wrote:
>
>
>
> >On Apr 25, 9:05 pm, "William Sommerwerck" <grizzledgee...@comcast.net>
> >wrote:
> >> >> I find it impossible to believe that /any/ microwave oven
> >> >> would use a crystal or resonator -- which costs money --
> >> >> when the power frequency is /right there/, and free.
> >> > They would use the same crystal as the microprocessor,
> >> > and run the clock in software.
>
> >> I was, of course, referring to a separate crystal (he said, retro-conning
> >> the issue).
>
> >It is possible to have a second crystal, as I have seen a custom IC
> >that included an RTC inside have its own separate 3.579mhz
> >crystal in addition to the crystal for the CPU function. Both
> >connected to the same IC on separate pins.
> >In this case though, this second crystal would be just for the RTC
> >function,
> >as the low speed would save power, and also the rest of the chip would
> >likely be shut down also to save power hence no software clock.
> >This was an early 1990s design
>
> >As microwaves don't have a RTC in them (that I have seen) and simply
> >reset to 12:00 or whatever after a power failure,
> >there is no need for the more sophisticated system described above.
>
> That IS a RTC. It just has no battery backup to ride through power
> outages.
>
>

Sorry - I was referring to a RTC as a dedicated clock IC either in or
out of a custom IC.
battery backed up

I would think that a microwave clock would be done in software though,
and not have
a dedicated clock section in the custom IC, not that it matters
though.

>
>

==============================================================================
TOPIC: Modifying a USB cable to charge iPod without PC connection
http://groups.google.com/group/sci.electronics.repair/t/c6ee222855c74ad2?hl=en
==============================================================================

== 1 of 4 ==
Date: Sat, Apr 30 2011 1:50 am
From: Jasen Betts

On 2011-04-29, Man-wai Chang <toylet.toylet@gmail.com> wrote:
> http://www.gizmodo.com.au/2008/07/simple_hack_turns_usb_charger_units_into_iphone_chargers-2/
>
>
> +5V ---50k --- D-
> |
> 10k
> |
> GND ---40K --- D+
>
> Is this safe? Would it work?

As you're not putting more than 3.3V on the data lines it looks fine
to me.

There's a standard for power-only USB sockets.
it's basically 5V and some resistors, I'm not sure how close to it
that layout it is, I'd research and try the standard way first.

--
⚂⚃ 100% natural

== 2 of 4 ==
Date: Sat, Apr 30 2011 2:12 am
From: Jasen Betts

At initial glance it seems good, but I haven't read the whole USB
charging specification.

http://www.usb.org/developers/devclass_docs/Battery_Charging_V1_2.zip

== 3 of 4 ==
Date: Sat, Apr 30 2011 4:03 am
From: Man-wai Chang

> At initial glance it seems good, but I haven't read the whole USB
> charging specification.
> http://www.usb.org/developers/devclass_docs/Battery_Charging_V1_2.zip

Too much information.... -_-"

Are you saying that the voltage over D+ and D- should be smaller than
2.0V and 2.5V respectively?

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 18:57:01 up 5 days 22:58 1 user load average: 1.01 1.06 1.05
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

== 4 of 4 ==
Date: Sat, Apr 30 2011 5:17 am
From: Jasen Betts

On 2011-04-30, Man-wai Chang <toylet.toylet@gmail.com> wrote:
>> At initial glance it seems good, but I haven't read the whole USB
>> charging specification.
>> http://www.usb.org/developers/devclass_docs/Battery_Charging_V1_2.zip
>
> Too much information.... -_-"
>
> Are you saying that the voltage over D+ and D- should be smaller than
> 2.0V and 2.5V respectively?

The only maximum voltage number I saw quoted for those pins was 3.6V
I skimmed it, mostly I did searches and looked at the diagrams.

--
⚂⚃ 100% natural

==============================================================================
TOPIC: Vietnamese Marshall
http://groups.google.com/group/sci.electronics.repair/t/83dfedaa7815fcd1?hl=en
==============================================================================

== 1 of 2 ==
Date: Sat, Apr 30 2011 2:59 am
From: "Arfa Daily"

"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:921htmFlniU1@mid.individual.net...
>
> "Arfa Daily"
>
>>>> So are my schematics for the Marshall MA100 any use to you ? If so,
>>>> contact me and I'll send them to you ...
>>>
>>>
>>> ** You can send them to " rode@sound.au.com " if you like.
>>>
>>
>> Done.
>
> ** Thanks.
>
> I'll let you know if they are for the same amp.
>
>
> ..... Phil
>
>

OK. Noted.

Arfa

== 2 of 2 ==
Date: Sat, Apr 30 2011 6:43 am
From: Boris Mohar

On Fri, 29 Apr 2011 12:41:47 +0100, "Arfa Daily" <arfa.daily@ntlworld.com>
wrote:

>
>
>"Phil Allison" <phil_a@tpg.com.au> wrote in message
>news:91uvn5FnqfU1@mid.individual.net...
>>
>> "Phil Allison"
>>
>>> ** A rather new looking Marshall " MA100H " valve head landed on my bench
>>> today - but it looked a bit different.
>>
>>
>> ** Anyone located a schem for this POS on the net ??
>>
>>
>>
>> ... Phil
>>
>
>I have three different issue numbers of schematics for the MA100, but none
>seem to identify specifically an MA100 "H". If they are any use to you,
>contact me off-group.
>
>Arfa

Would this contain the schematic? It is not a service manual if there is
such a thing.

http://cgi.ebay.com/MARSHALL-MA100H-MA100C-MA50H-MA50C-OWNERS-MANUAL-/290517800721
--
Boris

==============================================================================
TOPIC: Old style filament lamps?
http://groups.google.com/group/sci.electronics.repair/t/8b70a4142ec9c2ec?hl=en
==============================================================================

== 1 of 2 ==
Date: Sat, Apr 30 2011 3:18 am
From: "William Sommerwerck"

> Yes Terry. See my other posts making mention of this.
> Apparently, pearlised types were the first to be phased out,
> because they consume more energy to make than clear ones.
> Oh brother ! And I suppose that CFLs, with their hundreds of
> manufacturing processes, don't ... ?

What about simple selfishness on the part of the consumer?

Suppose a 100W-equivalent CFL that draws 25W lasts only 1000 hours. In that
time you save 75kWh. At 10 cents per kWh, that's $7.50 -- three times the
cost of the bulb.

== 2 of 2 ==
Date: Sat, Apr 30 2011 5:36 am
From: Andrew Rossmann

In article <94b2fa10-76cc-46af-b62e-bea8584c896c@
18g2000prd.googlegroups.com>, spamtrap1888@gmail.com says...
> My torchieres were designed to fit 50-100-150 W bulbs. No one makes a
> globe or bullet brightness equivalent, much less a three-way CFL. I
> tried a "100 W equivalent" twisty bulb, and promptly brushed it
> against the ceiling, turning my living room into a hazmat scene.

3-way CFL's do exist. I have several. In the US, Target and WalMart sell
a GE branded one. Sylvania also makes one that you can find at home
improvement stores. There are also several store-brand models.

--
If there is a no_junk in my address, please REMOVE it before replying!
All junk mail senders will be prosecuted to the fullest extent of the
law!!
http://home.comcast.net/~andyross

==============================================================================
TOPIC: Ganged Pots
http://groups.google.com/group/sci.electronics.repair/t/ed76e380cee9ebeb?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Apr 30 2011 4:05 am
From: "Wild_Bill"

The old electronic parts catalogs used to have stackable components for
adding pots (and switches) in almost any configuration, but I haven't seen
'em for quite a few years.

If any suppliers still make those components, I suppose the vintage/tube
equipment repair/restoration folks would know.

--
Cheers,
WB
.............

"Pilgrim" <pilgrim@noemail.net> wrote in message
news:pilgrim-476D5E.16075529042011@70-3-168-216.pools.spcsdns.net...
> Allen Bradley used to make "Mod Pots". Didn't some one else pick up this
> line after they stopped? What value/s do you need? I have some new old
> stock.
>
> Chuck P.

==============================================================================
TOPIC: Name of plug in US
http://groups.google.com/group/sci.electronics.repair/t/e7b21b0c6fd7afc7?hl=en
==============================================================================

== 1 of 13 ==
Date: Sat, Apr 30 2011 4:39 am
From: Man-wai Chang

http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S46D06/ref=sr_1_10?ie=UTF8&qid=1304163450&sr=8-10

What's the name of the plugs in USA?

It seems that USA televisions only use F Type connectors.

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 19:36:01 up 5 days 23:37 1 user load average: 1.09 1.05 1.05
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

== 2 of 13 ==
Date: Sat, Apr 30 2011 4:55 am
From: Bob Villa

On Apr 30, 6:39 am, Man-wai Chang <toylet.toy...@gmail.com> wrote:
> http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S...
>
> What's the name of the plugs in USA?
>
> It seems that USA televisions only use F Type connectors.
>
> --
> @~@ Might, Courage, Vision, SINCERITY.
> / v \ Simplicity is Beauty! May the Force and farces be with you!
> /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
> ^ ^ 19:36:01 up 5 days 23:37 1 user load average: 1.09 1.05 1.05
> 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

RG6 or RG59. Mostly RG6 now for cable and satellite receivers.

http://www.walmart.com/ip/RCA-12-RG-6-Digital-Coaxial-Cable-With-Gold-Plated-F-Connectors-White/11600133?adid=77777777913300000038&wmlspartner=PSGooglePLA&ci_src=17588969&ci_sku=11600133

== 3 of 13 ==
Date: Sat, Apr 30 2011 5:00 am
From: The Ghost in The Machine

On Apr 30, 7:39 am, Man-wai Chang <toylet.toy...@gmail.com> wrote:
> http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S...
>
> What's the name of the plugs in USA?
>
> It seems that USA televisions only use F Type connectors.
>
> --
> @~@ Might, Courage, Vision, SINCERITY.
> / v \ Simplicity is Beauty! May the Force and farces be with you!
> /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
> ^ ^ 19:36:01 up 5 days 23:37 1 user load average:1.09 1.05 1.05
> 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

THE ONES IN THE PIX ARE BNC CONNECTORS, USED IN SECURITY VIDEO SYSTEMS
IN THE U.S. AS WELL AS THE F CONNECTORS FOR RF TV VIDEO

PAT ECUM
TGITM

== 4 of 13 ==
Date: Sat, Apr 30 2011 5:03 am
From: "RBM"

"Man-wai Chang" <toylet.toylet@gmail.com> wrote in message
news:ipgsjv$ep8$1@dont-email.me...
>
> http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S46D06/ref=sr_1_10?ie=UTF8&qid=1304163450&sr=8-10
>
> What's the name of the plugs in USA?
>
> It seems that USA televisions only use F Type connectors.
>
> --
> @~@ Might, Courage, Vision, SINCERITY.
> / v \ Simplicity is Beauty! May the Force and farces be with you!
> /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
> ^ ^ 19:36:01 up 5 days 23:37 1 user load average: 1.09 1.05 1.05
> ???! ???! ???! ???! ???! ???! ????? (CSSA):
> http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

That is correct

== 5 of 13 ==
Date: Sat, Apr 30 2011 5:06 am
From: The Ghost in The Machine

On Apr 30, 8:00 am, The Ghost in The Machine <proteus...@gmail.com>
wrote:
> On Apr 30, 7:39 am, Man-wai Chang <toylet.toy...@gmail.com> wrote:
>
> >http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S...
>
> > What's the name of the plugs ?
>
> THE ONES IN THE PIX ARE RCA CONNECTORS, USED IN SECURITY VIDEO SYSTEMS
> IN THE U.S. AS WELL AS THE F CONNECTORS FOR RF TV VIDEO
>
> PAT ECUM
> TGITM

OOPS!!! ON SECOND VIEWING THE ONE IN THE PIX IS USING CLASSY RCA
PLUGS, USED FOR COMPOSITE VIDEO AND AUDIO..

THE BNC CONNECTORS I MENTIONED ARE THE SLOTTED TWIST ON SUCKERS USED
AS EXPLAINED.

TGITM

== 6 of 13 ==
Date: Sat, Apr 30 2011 5:57 am
From: Ivan

On Apr 30, 7:39 am, Man-wai Chang <toylet.toy...@gmail.com> wrote:
> http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S...
>
> What's the name of the plugs in USA?
>
> It seems that USA televisions only use F Type connectors.
>
> --
> @~@ Might, Courage, Vision, SINCERITY.
> / v \ Simplicity is Beauty! May the Force and farces be with you!
> /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
> ^ ^ 19:36:01 up 5 days 23:37 1 user load average: 1.09 1.05 1.05
> 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

This looks to me like an RF plug I have seen used for antenna input on
some imported FM tuners (my Onkyo has one). I don't recall the name
but Radio Shack used to have adapters to fit both the male and female
varieties of this to U,S,-standard threaded
F connectors.

== 7 of 13 ==
Date: Sat, Apr 30 2011 6:23 am
From: Bill Gill

On 4/30/2011 6:39 AM, Man-wai Chang wrote:
>
> http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S46D06/ref=sr_1_10?ie=UTF8&qid=1304163450&sr=8-10
>
>
> What's the name of the plugs in USA?
>
> It seems that USA televisions only use F Type connectors.
>
You have gotten one good reply from The Ghost in the Machine,
although it took him 2 tries. It is an RCA plug, used for
audio.

Bill

== 8 of 13 ==
Date: Sat, Apr 30 2011 6:29 am
From: The Ghost in The Machine

On Apr 30, 8:57 am, Ivan <I...@ivanberger.com> wrote:
> On Apr 30, 7:39 am, Man-wai Chang <toylet.toy...@gmail.com> wrote:
>
> >http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S...
>
> > What's the name of the plugs in USA?
>
> > It seems that USA televisions only use F Type connectors.
>
> > --
> > @~@ Might, Courage, Vision, SINCERITY.
> > / v \ Simplicity is Beauty! May the Force and farces be with you!
> > /( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
> > ^ ^ 19:36:01 up 5 days 23:37 1 user load average:1.09 1.05 1.05
> > 不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa
>
> This looks to me like an RF plug I have seen used for antenna input on
> some imported FM tuners (my Onkyo has one). I don't recall the name
> but Radio Shack used to have adapters to fit both the male and female
> varieties of this to U,S,-standard threaded
> F connectors.

CORRECT

TGITM

== 9 of 13 ==
Date: Sat, Apr 30 2011 6:31 am
From: The Ghost in The Machine

On Apr 30, 9:23 am, Bill Gill <billne...@cox.net> wrote:
> On 4/30/2011 6:39 AM, Man-wai Chang wrote:
>
> >http://www.amazon.co.uk/Cable-Tex-Coaxial-Aerial-Cable-White/dp/B003S...
>
> > What's the name of the plugs in USA?
>
> > It seems that USA televisions only use F Type connectors.
>
> You have gotten one good reply from The Ghost in the Machine,
> although it took him 2 tries. It is an RCA plug, used for
> audio.
>
> Bill

We may both be wrong..
They look like RCA But they are in fact imports used on Antenna
Connections to Signal Amplifiers.

ztgitm

== 10 of 13 ==
Date: Sat, Apr 30 2011 6:52 am
From: Man-wai Chang

> We may both be wrong..
> They look like RCA But they are in fact imports used on Antenna
> Connections to Signal Amplifiers.

It's the TV antennae cable plug being used in Hong Kong, which was ruled
by UK before 1997. It's not RCA, the pin is shorter.

I wanna know the TECHNICAL name of that plug design.

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 21:51:01 up 6 days 1:52 1 user load average: 1.12 1.09 1.05
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

== 11 of 13 ==
Date: Sat, Apr 30 2011 6:53 am
From: Man-wai Chang

> RG6 or RG59. Mostly RG6 now for cable and satellite receivers.

No... tHe pin is a bit bigger and round at the tip. Not like BNC.

--
@~@ Might, Courage, Vision, SINCERITY.
/ v \ Simplicity is Beauty! May the Force and farces be with you!
/( _ )\ (x86_64 Ubuntu 9.10) Linux 2.6.38.4
^ ^ 21:58:01 up 6 days 1:59 1 user load average: 1.25 1.13 1.07
不借貸! 不詐騙! 不援交! 不打交! 不打劫! 不自殺! 請考慮綜援 (CSSA):
http://www.swd.gov.hk/tc/index/site_pubsvc/page_socsecu/sub_addressesa

== 12 of 13 ==
Date: Sat, Apr 30 2011 7:16 am
From: "Stephen"

All of you are all wrong.. The plugs that are on the white cable in the
Weblink is in fact known as Belling Lee. They are used all over Great
Britain for both FM and UHF TV The ones in the pic are the male version of
Belling Lee.

== 13 of 13 ==
Date: Sat, Apr 30 2011 7:16 am
From: "Chris S."

"Man-wai Chang" <toylet.toylet@gmail.com> wrote in message
news:iph4j9$4at$1@dont-email.me...
>> We may both be wrong..
>> They look like RCA But they are in fact imports used on Antenna
>> Connections to Signal Amplifiers.
>
> It's the TV antennae cable plug being used in Hong Kong, which was ruled
> by UK before 1997. It's not RCA, the pin is shorter.
>
> I wanna know the TECHNICAL name of that plug design.
>

Isn't it just a push-on non threaded F Connector?

Chris

==============================================================================
TOPIC: Challenge of Repairing vs Trashing
http://groups.google.com/group/sci.electronics.repair/t/3cd5c17c8ebe1b1c?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Apr 30 2011 5:08 am
From: "Wild_Bill"

The specific cheapest models I mentioned are 9-LED, with 3-AAA cell holders,
which came from an eBag seller.. but generally the quality of much of
Harbor-F merchandise.

The switch is in the end cap.. and another characteristic of low quality
units, is the shiney plastic flexible vinyl covers on the switches, not the
softer, flat black more rubbery-like stuff.

The case is 7/8 to 15/16" in diameter, and 3-1/4" length overall.. very thin
tubing without many deep features.

The value may be to salvage the LEDs (since the leads are long and not
soldered) and the battery holder for use in other, better lights.
These cheap units aren't even good gifts, IMO.. probably better as give-away
trinkets but not to friends.

--
Cheers,
WB
.............

<hrhofmann@att.net> wrote in message
news:c50578f0-234d-4469-b205-f07da001ea46@m13g2000yqb.googlegroups.com...
On Apr 26, 2:13 pm, "Wild_Bill" <wb_wildb...@XSPAMyahoo.com> wrote:
> There are some very poorly made LED flashlights around, and some of them
> are
> anything but reliable.
>
> I generally take most things apart to see the (lack of) quality of
> work/production methods.
> One package of extremely low cost 3-AAA cell F-Ls were made to very low
> quality standards.. the LED leads were just twisted together to form the
> (+)
> battery contact, and the (-) leads-to-case were just jammed between the
> plastic "reflector" and case.
> Apparently, these were all hand assembled, and had no soldered connections
> in them.
>
>

Is this a Harbor Freight lite, of one very similar? The switch is a
rubber button in the screw-on base, and is marginally usable for 500
pushes.

==============================================================================
TOPIC: three pin multi colour led to two pin led
http://groups.google.com/group/sci.electronics.repair/t/f2426227629ec773?hl=en
==============================================================================

== 1 of 1 ==
Date: Sat, Apr 30 2011 5:12 am
From: "Wild_Bill"

Use 2 white LEDs and color them blue with a Sharpie or similar translucent
coloring.

--
Cheers,
WB
.............

"tom" <tominto@gmail.com> wrote in message
news:b435286a-324a-429c-b276-1d8b3d5abc0f@w21g2000yqm.googlegroups.com...
> Hello. I've never done this before so I just want to make sure I'm
> doing this correctly. I want to change a three pin multi colour led
> activity light on a dvd drive to a two pin blue led. I'm guessing I
> need to join the two cathode inputs on the circuit board together?
> Makes sense to me but I don't want to screw anything up. Thanks

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