http://groups.google.com/group/sci.electronics.repair?hl=en
sci.electronics.repair@googlegroups.com
Today's topics:
* Looking For Usable Multimeter - Cheap - 9 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/e1a0542b17d8b08d?hl=en
* Slightly odd output stage configuration. Thoughts ? - 9 messages, 4 authors
http://groups.google.com/group/sci.electronics.repair/t/2588a3ac4e8b297d?hl=en
* ROMANTIC ACTRESS SO HOT XXXX VIDEOS AND NUDE PICTURES HERE - 1 messages, 1
author
http://groups.google.com/group/sci.electronics.repair/t/099f981bac169536?hl=en
* Cheap Wholesale Nike Air Max Tailwind<free shipping paypal payment><http://
www.cntrade88.com/> - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/da637941f2134195?hl=en
* Proxy to open blocked sites - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/a790210194504e40?hl=en
* Adding RGB input to Sony Trinitron - 3 messages, 2 authors
http://groups.google.com/group/sci.electronics.repair/t/068db87850076058?hl=en
* Washing machine motor won't start, bad triac ? - 1 messages, 1 author
http://groups.google.com/group/sci.electronics.repair/t/96d2b3fb706b3e62?hl=en
==============================================================================
TOPIC: Looking For Usable Multimeter - Cheap
http://groups.google.com/group/sci.electronics.repair/t/e1a0542b17d8b08d?hl=en
==============================================================================
== 1 of 9 ==
Date: Sat, Feb 26 2011 1:45 am
From: "Dave Plowman (News)"
In article <V9SdnShGi7c67PXQnZ2dnUVZ_sidnZ2d@earthlink.com>,
Michael A. Terrell <mike.terrell@earthlink.net> wrote:
> "Dave Plowman (News)" wrote:
> >
> > In article <ipCdnVVbGqQnmvXQnZ2dnUVZ_hudnZ2d@earthlink.com>,
> > Michael A. Terrell <mike.terrell@earthlink.net> wrote:
> > > > > I agree. I use mine all the time, but the contacts inside are
> > > > > wearing out. Where would you find an inexpensive new analog
> > > > > meter? Do they even make them anymore?
> > > >
> > > > A half decent DVM will have a a bargraph to mimic a needle
> > > > movement.
> >
> > > A decent DVM won't have a bargraph to annoy you.
> >
> > It's there to inform. Of course information may well annoy you. And I
> > consider my Fluke quite decent.
> When you're at a bench with over 30 pieces of test equipment,
> including four or more identical DVMs the bargraph is just more visual
> noise.
Thought the question was about the spec for a basic DVM?
As regards a bargraph being 'visual noise' that's the whole point. It
draws your attention to the direction and rate of change. If you're using
'30 pieces of test equipment' at once, you can't possibly read them all
accurately at any one point in time - so a bargraph sounds to me even more
useful here.
--
*The statement above is false
Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.
== 2 of 9 ==
Date: Sat, Feb 26 2011 5:23 am
From: "William Sommerwerck"
This discussion reminds me of the article on digital voltmeters in
"Electronics World" about 50 years ago.
Back then, they were huge, taking up (if I recall correctly) a 3U or 4U
space. The meter they described was a Non-Linear Systems model. Its ADC was
electromechanical, (!) using a relay-controlled voltage divider on a
highly-accurate voltage source to create successively closer approximations
to the input voltage.
There were no commercial LED displays, of course, so the results were
displayed using incandescent lamps to side-illuminate numbers cut into
polycarbonate blocks! (I don't know why NLS didn't use Nixie tubes.)
== 3 of 9 ==
Date: Sat, Feb 26 2011 5:27 am
From: "Michael A. Terrell"
"Dave Plowman (News)" wrote:
>
> In article <V9SdnShGi7c67PXQnZ2dnUVZ_sidnZ2d@earthlink.com>,
> Michael A. Terrell <mike.terrell@earthlink.net> wrote:
>
> > "Dave Plowman (News)" wrote:
> > >
> > > In article <ipCdnVVbGqQnmvXQnZ2dnUVZ_hudnZ2d@earthlink.com>,
> > > Michael A. Terrell <mike.terrell@earthlink.net> wrote:
> > > > > > I agree. I use mine all the time, but the contacts inside are
> > > > > > wearing out. Where would you find an inexpensive new analog
> > > > > > meter? Do they even make them anymore?
> > > > >
> > > > > A half decent DVM will have a a bargraph to mimic a needle
> > > > > movement.
> > >
> > > > A decent DVM won't have a bargraph to annoy you.
> > >
> > > It's there to inform. Of course information may well annoy you. And I
> > > consider my Fluke quite decent.
>
> > When you're at a bench with over 30 pieces of test equipment,
> > including four or more identical DVMs the bargraph is just more visual
> > noise.
>
> Thought the question was about the spec for a basic DVM?
>
> As regards a bargraph being 'visual noise' that's the whole point. It
> draws your attention to the direction and rate of change. If you're using
> '30 pieces of test equipment' at once, you can't possibly read them all
> accurately at any one point in time - so a bargraph sounds to me even more
> useful here.
Maybe, if you want to be distracted. I was testing modules in
$20,000 to $80,000 (US) telemetry receiving systems. The 'Video
Combiner' module compared the linear 0-5V AGC buss in two receivers, and
was allowed an error of under 1.5 mV.
I wouldn't use any meter with one on my bench, but some techs wanted
them even though they were useless. They also clutter their benches with
piles of other useless crap. Tell me of ANY bargraph that will give
useful indication when the change is in millivolts, where the voltage
being measured is 5 to 15 volts. The bargraph would be 2 volts per
division. The bargraph driver is noisy enough that the display is
unstable at the boundaries, and some are used with an overlap to reduce
flicker. it does this by dithering the reference voltage.
--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.
== 4 of 9 ==
Date: Sat, Feb 26 2011 5:30 am
From: "Michael A. Terrell"
William Sommerwerck wrote:
>
> This discussion reminds me of the article on digital voltmeters in
> "Electronics World" about 50 years ago.
>
> Back then, they were huge, taking up (if I recall correctly) a 3U or 4U
> space. The meter they described was a Non-Linear Systems model. Its ADC was
> electromechanical, (!) using a relay-controlled voltage divider on a
> highly-accurate voltage source to create successively closer approximations
> to the input voltage.
>
> There were no commercial LED displays, of course, so the results were
> displayed using incandescent lamps to side-illuminate numbers cut into
> polycarbonate blocks! (I don't know why NLS didn't use Nixie tubes.)
HP made a voltmeter plugin for their 5245L frequency counter. That
was mid '60s vintage.
--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.
== 5 of 9 ==
Date: Sat, Feb 26 2011 5:43 am
From: "William Sommerwerck"
> Tell me of ANY bargraph that will give useful indication
> when the change is in millivolts, where the voltage being
> measured is 5 to 15 volts. The bargraph would be 2 volts
> per division.
I think it's rather finer than that. (My Fluke 87 has 51 points.) But no one
(that I know of) makes a DVM with that can display millivolt changes when
the input is hundreds of millivolts.
The purpose of the bargraph is to give the tech an easily interpreted
indication of which way the measurement is tending, without having to
"interpret" the numbers. And it responds much more quickly than the display
can settle.
I have little need for the bargraph display. But it adds little to the cost
of the meter, and it's there when I do.
== 6 of 9 ==
Date: Sat, Feb 26 2011 5:46 am
From: "William Sommerwerck"
>> There were no commercial LED displays, of course, so the
>> results were displayed using incandescent lamps to side-
>> illuminate numbers cut into polycarbonate blocks! (I don't
>> know why NLS didn't use Nixie tubes.)
> HP made a voltmeter plugin for their 5245L frequency counter.
> That was mid '60s vintage.
Interesting. I had an SWTP modular unit, though that was a lot later.
The NLS appeared earlier, I believe. George Kay (as in Kaypro) is given
credit for the first digital voltmeter.
== 7 of 9 ==
Date: Sat, Feb 26 2011 9:39 am
From: "Shaun"
"Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
news:ipCdnVVbGqQnmvXQnZ2dnUVZ_hudnZ2d@earthlink.com...
>
> "Dave Plowman (News)" wrote:
>>
>> In article <20110223-162100.250.0@news.astraweb.com>,
>> Peabody <waybackNO746SPAM44@yahoo.com> wrote:
>> > > There's a bi-monthly swap meet near me for computer
>> > > stuff, etc. that has old voltmeters (analog too!). They
>> > > are mostly returns that somebody blew the fuse in and
>> > > returned. Watching a needle move *can* give useful
>> > > information that a digital readout doesn't easily
>> > > communicate.
>>
>> > I agree. I use mine all the time, but the contacts inside
>> > are wearing out. Where would you find an inexpensive new
>> > analog meter? Do they even make them anymore?
>>
>> A half decent DVM will have a a bargraph to mimic a needle movement.
>
>
> A decent DVM won't have a bargraph to annoy you.
>
>
> --
> You can't fix stupid. You can't even put a band-aid on it, because it's
> Teflon coated.
>
Fluke meters have a bar graph and I find it usefull.
== 8 of 9 ==
Date: Sat, Feb 26 2011 12:26 pm
From: "Michael A. Terrell"
Shaun wrote:
>
> "Michael A. Terrell" <mike.terrell@earthlink.net> wrote in message
> news:ipCdnVVbGqQnmvXQnZ2dnUVZ_hudnZ2d@earthlink.com...
> >
> > "Dave Plowman (News)" wrote:
> >>
> >> In article <20110223-162100.250.0@news.astraweb.com>,
> >> Peabody <waybackNO746SPAM44@yahoo.com> wrote:
> >> > > There's a bi-monthly swap meet near me for computer
> >> > > stuff, etc. that has old voltmeters (analog too!). They
> >> > > are mostly returns that somebody blew the fuse in and
> >> > > returned. Watching a needle move *can* give useful
> >> > > information that a digital readout doesn't easily
> >> > > communicate.
> >>
> >> > I agree. I use mine all the time, but the contacts inside
> >> > are wearing out. Where would you find an inexpensive new
> >> > analog meter? Do they even make them anymore?
> >>
> >> A half decent DVM will have a a bargraph to mimic a needle movement.
> >
> >
> > A decent DVM won't have a bargraph to annoy you.
> >
> >
> > --
> > You can't fix stupid. You can't even put a band-aid on it, because it's
> > Teflon coated.
> >
>
> Fluke meters have a bar graph and I find it usefull.
God for you. I never have. BTW, it's spelled useful, with one 'l'.
--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.
== 9 of 9 ==
Date: Sat, Feb 26 2011 12:47 pm
From: "Michael A. Terrell"
William Sommerwerck wrote:
>
> > Tell me of ANY bargraph that will give useful indication
> > when the change is in millivolts, where the voltage being
> > measured is 5 to 15 volts. The bargraph would be 2 volts
> > per division.
>
> I think it's rather finer than that. (My Fluke 87 has 51 points.) But no one
> (that I know of) makes a DVM with that can display millivolt changes when
> the input is hundreds of millivolts.
>
> The purpose of the bargraph is to give the tech an easily interpreted
> indication of which way the measurement is tending, without having to
> "interpret" the numbers. And it responds much more quickly than the display
> can settle.
>
> I have little need for the bargraph display. But it adds little to the cost
> of the meter, and it's there when I do.
I used meters like a Boonton 9200, a Fluke 8920A and several 4.5
digit or better general purpose DVMs. The signal generators and
frequency counters were all connected to the in house 10 MHz frequency
standard and we had an in house metrology lab.
--
You can't fix stupid. You can't even put a band-aid on it, because it's
Teflon coated.
==============================================================================
TOPIC: Slightly odd output stage configuration. Thoughts ?
http://groups.google.com/group/sci.electronics.repair/t/2588a3ac4e8b297d?hl=en
==============================================================================
== 1 of 9 ==
Date: Sat, Feb 26 2011 5:00 am
From: "Arfa Daily"
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:8srb56FhrbU1@mid.individual.net...
>
> "Arfa Daily"
>
>> He wants the output bias changing from fixed grid to cathode auto,
>
>
> ** That will either lose you a lot of output power or cook that puny power
> tranny ( by going close to class A operation) if you don't do it the
> smart way.
>
> Not recommended either.
>
>
>
>
> ..... Phil
>
>
>
>
Well, that one is a well known and documented mod for that amp, so I'm not
too concerned about doing it. However, I take (and somewhat agree with) your
point. Personally, I would prefer to make the fixed grid bias variable
within 'blues to rock' limits, and give him another knob to twiddle with,
but he is adamant that he wants that particular cathode bias mod. I did
offer to make that switchable for him, but he just wants it changing and
leaving at that. You can only advise these people, but in the end, it's his
amp, and if he's prepared to pay the money to have it done at his own risk,
then that's fine by me ...
Arfa
== 2 of 9 ==
Date: Sat, Feb 26 2011 5:09 am
From: "Phil Allison"
"Arfa Daily = MORONIC TROLL "
>>
>>> He wants the output bias changing from fixed grid to cathode auto,
>
>>
>> ** That will either lose you a lot of output power or cook that puny
>> power tranny ( by going close to class A operation) if you don't do it
>> the smart way.
>>
>> Not recommended either.
>
>
> Well, that one is a well known and documented mod for that amp, so I'm not
> too concerned about doing it.
** ROTFLMAO !!
Wot a fucking moron the stupid pommy cunt is.
Only posts questions he already THINKS he knows the answers to.
Just so the pommy cunt can smugly contradict anyone who dares to reply.
Wot a fucking MORON !!!!!!!!!!!!
..... Phil
== 3 of 9 ==
Date: Sat, Feb 26 2011 5:09 am
From: "Arfa Daily"
"Phil Allison" <phil_a@tpg.com.au> wrote in message
news:8sroeoFpkvU1@mid.individual.net...
>
> "David Nebenzahl"
> Phil Allison spake thus:
>>
>>> Also, the power output will of course drop in triode mode and each EL84
>>> will dissipate more heat under overdrive. Combined with their use of a
>>> "concertina" phase splitter, I suspect that overdrive clipping will not
>>> be symmetrical.
>>
>> If you wouldn't mind indulging my relative ignorance for a minute, that
>> "concertina" stage business got my curiosity up. So I found the two
>> triode (12AX7) stages before the EL84s, and it looks to me like the first
>> stage (V3A) is a phase inverter,
>
>
> ** With an imagination like that - you should be writing fiction for a
> living.
>
> A " phase inverter" ( or phase splitter) has equal and opposite polarity
> outputs.
>
>
>> with the other triode acting as *another* phase inverter cascaded from
>> the first stage, presumably with unity gain. Is that correct?
>
> ** Nope.
>
> V3A is a voltage amplifier ( gain of about 50 before NFB) while V3B is
> the "concertina" phase inverter. Concertina circuits always have equal
> plate and cathode resistors and in operation, the voltage between the
> plate and cathode grows and falls with audio drive like a concertina being
> pumped in and out.
>
> The cathode of V3A acts as a negative ( opposite phase) input for
> feedback from the output transformer secondary.
>
> Because of the easy drive requirements of an EL84, such a concertina
> circuit is able to send them deep into overdrive - while maintaining good
> symmetry. Not so for 6L6GC or EL34 stages which need several times more
> drive voltage.
>
>
> .... Phil
>
>
So is it the fact that the circuit relies to some extent on NFB for correct
symmetrical overdrive operation, that leads you to believe that this might
be upset by operating in a pseudo-triode mode ?
Interesting analysis. I'll report back when I've tried it
Arfa
== 4 of 9 ==
Date: Sat, Feb 26 2011 5:14 am
From: "Phil Allison"
"Arfa Daily is total FUCKWIT TROLL "
>
> So is it the fact that the circuit relies to some extent on NFB for
> correct symmetrical overdrive operation, that leads you to believe that
> this might be upset by operating in a pseudo-triode mode ?
** Giant HUH ??????????
How does anyone get THAT nonsense from anything I posted ???
Hey Daily - you are a fucking IDIOT !!
GO DROP DEAD
.... Phil
== 5 of 9 ==
Date: Sat, Feb 26 2011 5:49 am
From: "William Sommerwerck"
> ** ROTFLMAO !!
> Wot a fucking moron the stupid pommy cunt is.
> Only posts questions he already THINKS he knows the answers to.
> Just so the pommy cunt can smugly contradict anyone who dares to reply.
> Wot a fucking MORON !!!!!!!!!!!!
<hands on hips; huffy>
You are SO out of line, mister!
</hands on hips; huffy>
I guess you have never been unsure about something, and asked for
confirmation. How nice it is to be omniscient!
== 6 of 9 ==
Date: Sat, Feb 26 2011 7:23 am
From: Meat Plow
On Sat, 26 Feb 2011 02:25:00 +0000, Arfa Daily wrote:
> "Meat Plow" <mhywatt@yahoo.com> wrote in message
> news:pan.2011.02.25.18.42.19@lmao.lol.lol...
>> On Fri, 25 Feb 2011 17:00:41 +0000, Arfa Daily wrote:
>>
>>> A muso customer has asked me to carry out some tonal mods to his
>>> Peavey Classic 30. All pretty straightforward cap changes and so on.
>>> However, he also asked me to look into fitting a pentode / triode
>>> switch whilst I was at it. At first glance, this didn't look like a
>>> problem. The output stage is a fairly classic AB class using 4 x EL84
>>> tubes as two paralleled pairs. Anodes of each pair commoned. Cathodes
>>> all commoned and decked. Grids of each pair commoned via individual
>>> 47k stoppers. But then, things get a little odd around the screen
>>> grids. One tube of each pair, has its screen grid fed by a 100 ohm 5
>>> watt resistor off the "screen" supply rail, whilst the other of each
>>> pair, has its screen grid fed *direct* from the "screen" supply rail.
>>>
>>> I don't think I've seen this done before. I've seen one screen
>>> resistor feeding both tubes of a pair, or one resistor per screen, but
>>> not just one tube having a screen feed resistor. Apart from anything
>>> else, I wouldn't normally have considered it very good design practice
>>> to have no current limiting at all in place. Also, it will mean that
>>> the screen voltage will be higher on one tube of the pair, than the
>>> other. I doubt that it would have a significant effect on the
>>> operation of the stage, but just interested as to whether anyone else
>>> has come across this configuration, and knows the design reasoning
>>> behind it. Anyone got any opinions about just strapping the screens to
>>> the anodes on each pair via a switch, to implement a triode mode ?
>>>
>>> Arfa
>>
>> Several amp and tone stack mods. Variable cathode bias, OD mod on CH2,
>> OT replacement, speaker replacement.
>>
>> blueguitar.org/new/articles/blue_gtr/amps/peavey/c30_origmod.pdf
>>
>>
>>
> Hi Meat. Yes, it is Blue Guitar mods that he wants to do. He is not
> interested in the changes to the tone stack. He wants the output bias
> changing from fixed grid to cathode auto, he wants the C4 cap value
> change in the overdrive channel, and he wants the input simplification
> mod, where all the C-R garbage between the I/P socket and the first
> 12AX7 grid is removed, and a simple series resistor and grid return
> resistor are put in their place, a la typical Fender and Marshall I/P
> schemes.
>
> Arfa
Looks like a good bit of work in store for you. The hard part is to end
up with tone that doesn't sound like ass.
--
Live Fast, Die Young and Leave a Pretty Corpse
== 7 of 9 ==
Date: Sat, Feb 26 2011 1:09 pm
From: "Phil Allison"
"William Sommerwanker "
>
>> ** ROTFLMAO !!
>> Wot a fucking moron the stupid pommy cunt is.
>> Only posts questions he already THINKS he knows the answers to.
>> Just so the pommy cunt can smugly contradict anyone who dares to reply.
>> Wot a fucking MORON !!!!!!!!!!!!
>
>
> I guess you have never been unsure about something, and asked for
> confirmation.
** That is NOT what the CUNT did !!
You illiterate, fuckwit bloody TROLL.
== 8 of 9 ==
Date: Sat, Feb 26 2011 1:55 pm
From: Meat Plow
On Sun, 27 Feb 2011 08:09:44 +1100, Phil Allison wrote:
> illiterate, fuckwit bloody TROLL.
Yes you are. You can't wait for someone to reply to
your trolls so you can attack them. I take that back,
your not a Troll. Trolls have some scruples. You wouldn't
recognize scruples if they booted your weasel nuts up your
fucking greasy, shit encrusted throat.
--
Live Fast, Die Young and Leave a Pretty Corpse
== 9 of 9 ==
Date: Sat, Feb 26 2011 2:02 pm
From: "Phil Allison"
"Meat Plow is a Lying Retarded PIG "
> Could refit with two EL34s.
** Make any issues worse, not better.
> My Musicman 112 combo uses a pair of Mullards
> at around 700v plate.
** And only half that voltage on the screens.
Not relevant at all - fuckhead.
Now how about you post something that MAKES SENSE.
But you cannot.
And you keep proving it.
My god you are retarded, fucking jerk.
.... Phil
==============================================================================
TOPIC: ROMANTIC ACTRESS SO HOT XXXX VIDEOS AND NUDE PICTURES HERE
http://groups.google.com/group/sci.electronics.repair/t/099f981bac169536?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 26 2011 5:41 am
From: success all
==============================================================================
TOPIC: Cheap Wholesale Nike Air Max Tailwind<free shipping paypal payment><
http://www.cntrade88.com/>
http://groups.google.com/group/sci.electronics.repair/t/da637941f2134195?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 26 2011 6:21 am
From: xaingmei chen
Nike Air Max
Cheap Wholesale Nike Air Max 87 <free shipping paypal payment>
<http://
www.cntrade88.com/>
Cheap Wholesale Nike Air Max 89 <free shipping paypal payment>
Cheap Wholesale Nike Air Max 90 <freeshipping paypal payment>
<http://
www.cntrade88.com/>
Cheap Wholesale Nike Air Max 91 <free shipping paypal payment>
Cheap Wholesale Nike Air Max 92 Man<free shipping paypal payment>
Cheap Wholesale Nike Air Max 93 <free shipping paypal payment>
Cheap Wholesale Nike Air Max 95 <free shipping paypal payment>
<http://www.cntrade88.com/>
Cheap Wholesale Nike Air Max 97 <free shipping paypal payment>
<http://www.cntrade88.com/>
Cheap Wholesale Nike Air Max 180 Man <free shipping paypal payment>
Cheap Wholesale Nike Air Max 2006 paypal payment>
Cheap Wholesale Nike Air Max 2009 <http://www.cntrade88.com/>
<free shipping paypal payment>
Cheap Wholesale Nike Air Max Clssic BW <free shipping paypal payment>
Cheap Wholesale Nike Air Max LTD <free shipping paypal payment>
Cheap Wholesale Nike Air Max Skyline <http://www.cntrade88.com/>
<free shipping paypal payment>
Cheap Wholesale Nike Air Max STAB <free shipping paypal payment>
<http://www.cntrade88.com/>
Cheap Wholesale Nike Air Max Tailwind<free shipping paypal payment>
Cheap Wholesale Nike Air Max TN <free shipping paypal payment>
<http://www.cntrade88.com/>
==============================================================================
TOPIC: Proxy to open blocked sites
http://groups.google.com/group/sci.electronics.repair/t/a790210194504e40?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 26 2011 6:21 am
From: PeterD
On 2/26/2011 3:55 AM, Ahmed Ragab wrote:
> Proxy to open blocked sites
>
> http://ppmalwareropx.4mtm.net
>
> OR
>
> http://prmalwareonet.4mtm.net
Even better, a link to two sites serving up malware!
--
I'm never going to grow up.
==============================================================================
TOPIC: Adding RGB input to Sony Trinitron
http://groups.google.com/group/sci.electronics.repair/t/068db87850076058?hl=en
==============================================================================
== 1 of 3 ==
Date: Sat, Feb 26 2011 9:14 am
From: boardjunkie1
I picked up a flat face Trinitron yesterday for peanuts. I plan to use
this as an arcade game monitor (in a MAME setup) and need RGB and
seperate sync inputs.
From the schem, I see the "jungle" chip has RGB outputs, so I assume I
can insert the color gun signals here. What signal level is it wanting
to see here? .7v? Also, I need to keep the OSD for setup and
adjustments, so will this be the best option?
The schem is here:
http://www.eserviceinfo.com/downloadsm/36631/sony_KV-21FV10%20%20parte1.html
I can see a good place to tap in H sync (after the seperator), but I
don't see any reference to V sync. I see the output IC, but its a PITA
to trace it back.
Suggestions?
== 2 of 3 ==
Date: Sat, Feb 26 2011 12:05 pm
From: Adrian C
On 26/02/2011 17:14, boardjunkie1 wrote:
> I picked up a flat face Trinitron yesterday for peanuts. I plan to use
> this as an arcade game monitor (in a MAME setup) and need RGB and
> seperate sync inputs.
>
> From the schem, I see the "jungle" chip has RGB outputs, so I assume I
> can insert the color gun signals here. What signal level is it wanting
> to see here? .7v? Also, I need to keep the OSD for setup and
> adjustments, so will this be the best option?
>
> The schem is here:
> http://www.eserviceinfo.com/downloadsm/36631/sony_KV-21FV10%20%20parte1.html
>
> I can see a good place to tap in H sync (after the seperator), but I
> don't see any reference to V sync. I see the output IC, but its a PITA
> to trace it back.
>
> Suggestions?
You might find something useful here.
http://133fsb.wordpress.com/2010/05/22/adding-an-rgb-input-to-a-cheap-generic-ntsc-tv/
--
Adrian C
== 3 of 3 ==
Date: Sat, Feb 26 2011 12:27 pm
From: boardjunkie1
On Feb 26, 3:05 pm, Adrian C <em...@here.invalid> wrote:
> On 26/02/2011 17:14, boardjunkie1 wrote:
>
>
>
>
>
> > I picked up a flat face Trinitron yesterday for peanuts. I plan to use
> > this as an arcade game monitor (in a MAME setup) and need RGB and
> > seperate sync inputs.
>
> > From the schem, I see the "jungle" chip has RGB outputs, so I assume I
> > can insert the color gun signals here. What signal level is it wanting
> > to see here? .7v? Also, I need to keep the OSD for setup and
> > adjustments, so will this be the best option?
>
> > The schem is here:
> >http://www.eserviceinfo.com/downloadsm/36631/sony_KV-21FV10%20%20part...
>
> > I can see a good place to tap in H sync (after the seperator), but I
> > don't see any reference to V sync. I see the output IC, but its a PITA
> > to trace it back.
>
> > Suggestions?
>
> You might find something useful here.
>
> http://133fsb.wordpress.com/2010/05/22/adding-an-rgb-input-to-a-cheap...
>
> --
> Adrian C- Hide quoted text -
>
> - Show quoted text -
I saw that, but it looks as if he's using the OSD as the input point.
I'd rather not do that since I will need the OSD for setup.
Also, there is another set of RGB inputs on the jungle chip that are
tied to the supply line via caps. Maybe this is where the Euro
versions inject RGB via the scart input?
==============================================================================
TOPIC: Washing machine motor won't start, bad triac ?
http://groups.google.com/group/sci.electronics.repair/t/96d2b3fb706b3e62?hl=en
==============================================================================
== 1 of 1 ==
Date: Sat, Feb 26 2011 11:42 am
From: Baron
Sylvia Else Inscribed thus:
> On 24/02/2011 10:25 PM, Andre Majorel wrote:
>> On 2011-02-16, kwamena banson<virginbanson@gmail.com> wrote:
>>
>>> To be very sure you disconect the motor and test it on the mains at
>>> a reduced voltage.
>>
>> The BTB15-600C is hard to find but RS carry the BTB16-600C.
>> Swapping in a new triac made no difference, though.
>>
>> So I tried exactly what you're suggesting : motor on a big 24 V
>> transformer. If the rotor is a certain angle (or 180° from it),
>> the motor doesn't start when power is applied.
>>
>> When you reverse the phase on the stator (for reverse), you
>> still have a pair of diametrically opposed "dead spots" but
>> they're at an angle from the original ones.
>>
>
> That doesn't really sound right. Reversing the stator winding current
> should reverse the force on the rotor, not change a zero force into a
> non-zero force or vice versa.
>
> I'd have to wonder whether one of the rotor windings has failed
> open-cicuit. I think that could even account for the sparks. The
> magnetic field for a winding that is becoming disconnected by the
> brush action has to collapse because the broken winding that's being
> connected cannot maintain the field.
>
> Sylvia.
Sounds like OC segments on the comm...
--
Best Regards:
Baron.
==============================================================================
You received this message because you are subscribed to the Google Groups "sci.electronics.repair"
group.
To post to this group, visit http://groups.google.com/group/sci.electronics.repair?hl=en
To unsubscribe from this group, send email to sci.electronics.repair+unsubscribe@googlegroups.com
To change the way you get mail from this group, visit:
http://groups.google.com/group/sci.electronics.repair/subscribe?hl=en
To report abuse, send email explaining the problem to abuse@googlegroups.com
==============================================================================
Google Groups: http://groups.google.com/?hl=en