A
T
tm
Guest
"Arfa Daily" <arfa.daily@ntlworld.com> wrote in message
news:9%UWs.191675$1i1.37970@fx07.fr7...
switch as a fet or IGBT with an ohm meter.
tm
news:9%UWs.191675$1i1.37970@fx07.fr7...
Can you put up some pictures somewhere? You should be able to dope out the
switch as a fet or IGBT with an ohm meter.
tm
N
N_Cook
Guest
Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:9%UWs.191675$1i1.37970@fx07.fr7...
CFL circuit similar ?
http://www.nxp.com/documents/application_note/AN00048.pdf
news:9%UWs.191675$1i1.37970@fx07.fr7...
failed bleed resistor ?
CFL circuit similar ?
http://www.nxp.com/documents/application_note/AN00048.pdf
N
N_Cook
Guest
any opto-isolators with hold-off/control function?
A
Arfa Daily
Guest
"N_Cook" <diverse@tcp.co.uk> wrote in message
news:kghuia$njn$1@dont-email.me...
supply in the fixture that powers the electronics and lamp-house fan. The
fan supply also drives a relay on the faulty board. This relay is in series
with the mains. I'm assuming that it prevents the lamp from coming on,
unless the fan supply is established - not that this would help of course,
if the fan itself had failed ...
The relay is coming on, so this 'feature' is not associated with the current
problem.
Arfa
news:kghuia$njn$1@dont-email.me...
Nope, no optos. It does have a hold-off in that there is a separate little
supply in the fixture that powers the electronics and lamp-house fan. The
fan supply also drives a relay on the faulty board. This relay is in series
with the mains. I'm assuming that it prevents the lamp from coming on,
unless the fan supply is established - not that this would help of course,
if the fan itself had failed ...
The relay is coming on, so this 'feature' is not associated with the current
problem.
Arfa
A
Arfa Daily
Guest
"tm" <No_one_home@white-house.gov> wrote in message
news:kgh976$6q2$1@dont-email.me...
little switcher, except no primary or secondary-side filter electros.
I've done a bit more work on it this morning. I shoved it on a variac, and
hooked a 'scope up to it. Oddly, between about 60v and 160v (UK mains up to
240v), it works. It will drive a lamp, and support considerable current
demand. However, as you carry on up beyond 160v, you can watch the activity
around the switching devices progressively 'die', until it stops altogether,
so this is not going to be any kind of easy one ...
Arfa
news:kgh976$6q2$1@dont-email.me...
all. It's about a half brick size, and looks much like any other typical
little switcher, except no primary or secondary-side filter electros.
I've done a bit more work on it this morning. I shoved it on a variac, and
hooked a 'scope up to it. Oddly, between about 60v and 160v (UK mains up to
240v), it works. It will drive a lamp, and support considerable current
demand. However, as you carry on up beyond 160v, you can watch the activity
around the switching devices progressively 'die', until it stops altogether,
so this is not going to be any kind of easy one ...
Arfa
C
Cydrome Leader
Guest
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
power supply.
That's pretty high tech for a product from the 1970s to use a switching
power supply.
W
William Sommerwerck
Guest
"Cydrome Leader" wrote in message news:kglq1u$slf$3@reader1.panix.com...
switching supply.
I don't know which company was the first to make consumer products with
switching supplies -- but I wouldn't be surprised if it were Sony.
My first color TV -- purchased in 1974 -- was a Sony KV-1920. It had a
switching supply.
I don't know which company was the first to make consumer products with
switching supplies -- but I wouldn't be surprised if it were Sony.
Guest
On Wed, 27 Feb 2013 20:24:30 +0000 (UTC), Cydrome Leader
<presence@MUNGEpanix.com> wrote:
supplies we used were either switching or phase controlled (the really
large ones). I only remember one linear supply above 1kW, and that
was a 4V 1000A HP that was used in a piece of test equipment. Big as
a refrigerator, it was.
<presence@MUNGEpanix.com> wrote:
They weren't all that unknown in the '70s. Almost all of the large
supplies we used were either switching or phase controlled (the really
large ones). I only remember one linear supply above 1kW, and that
was a 4V 1000A HP that was used in a piece of test equipment. Big as
a refrigerator, it was.
C
Cydrome Leader
Guest
In sci.electronics.repair William Sommerwerck <grizzledgeezer@comcast.net> wrote:
the oldest thing in the junk pile with a switcher I have is an apple ][
computer.
Of course they forgot to add a cooling fan or ventilation slots which
Franklin Computer got right in their Ace series of clones.
I want to know more about this 1970s disco lighting system.
that is pretty advanced.
It could be.
the oldest thing in the junk pile with a switcher I have is an apple ][
computer.
Of course they forgot to add a cooling fan or ventilation slots which
Franklin Computer got right in their Ace series of clones.
I want to know more about this 1970s disco lighting system.
C
Cydrome Leader
Guest
In sci.electronics.repair krw@attt.bizz wrote:
I saw some open frame "international" style linear power supply at a
surplus dealer marked Intel with the Intel logo that was rated tens of
amps at something like 1.8 or 2.2 volts.
It was one of those preposterious things with extruded heatsinks and the
bent aluminum chassis around all the TO-3 cans.
I've noticed "interntional" linear power supplies these days are complete
crap compared to the ones from yesteryear. Condor was still making
somewhat decent ones about 5 years ago complete with silkscreened
copyrights of 1990 on the PCB and case.
ha. that thing must have been about 12% efficient.
I saw some open frame "international" style linear power supply at a
surplus dealer marked Intel with the Intel logo that was rated tens of
amps at something like 1.8 or 2.2 volts.
It was one of those preposterious things with extruded heatsinks and the
bent aluminum chassis around all the TO-3 cans.
I've noticed "interntional" linear power supplies these days are complete
crap compared to the ones from yesteryear. Condor was still making
somewhat decent ones about 5 years ago complete with silkscreened
copyrights of 1990 on the PCB and case.
T
Tim Williams
Guest
"William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message
news:kglvkk$a4o$1@dont-email.me...
RC-26 Receiving Tube Manual which depict a color set with half wave
(yuck!) offline rectification. Goes right to the flyback, whence all the
other voltages are generated. No heavy transformer (and, probably, a few
months lifetime for the poor sweep tube!).
Tim
--
Deep Friar: a very philosophical monk.
Website: http://seventransistorlabs.com
news:kglvkk$a4o$1@dont-email.me...
They'd been doing it since before then -- I have the schematics in my
RC-26 Receiving Tube Manual which depict a color set with half wave
(yuck!) offline rectification. Goes right to the flyback, whence all the
other voltages are generated. No heavy transformer (and, probably, a few
months lifetime for the poor sweep tube!).
Tim
--
Deep Friar: a very philosophical monk.
Website: http://seventransistorlabs.com
A
Arfa Daily
Guest
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:kglq1u$slf$3@reader1.panix.com...
1970s ? Where did you get that from ? It's actually about 4 or 5 years old
at a guess ...
Arfa
news:kglq1u$slf$3@reader1.panix.com...
1970s ? Where did you get that from ? It's actually about 4 or 5 years old
at a guess ...
Arfa
A
Arfa Daily
Guest
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:kgm1i4$a4g$2@reader1.panix.com...
Discos were not confined to the 1970s. They still run now. In fact I was out
on one handling the lighting and visualizations for a friend, just this last
Saturday night gone ...
Anyways, I've fixed the bloody thing now, and I have to say that it had me
fooled. The problem turned out to be a knackered lamp socket. Looking closer
at the specs, it's actually 250 watts not 150 as I first thought, so even
with the forced air cooling it has, the lamp house runs pretty damned hot,
and the lamp socket with it. Basically, the ballast is not a very good
design. It doesn't run at all with no load on it, and as the lampholder was
effectively open circuit, it indeed didn't run, which was the first way that
it fooled me. The second way was that not only does it not run with no load,
it only runs properly with the full designed load. So when I had it out on
the bench, and just had a couple of 50 watt 12 v halogen lamps in series as
a test load, it ran, but only until the mains input voltage got to 160 v on
my variac. Once it went past that, the switching activity progressively
died, until it stopped altogether again.
I had a replacement ceramic holder to hand, as I fix a fair few of these
lighting fixtures, so I grafted it in, and reconnected the lamp wiring to
the ballast. This time, it kicked up and ran the lamp at full intensity
without issue, so that's one to remember if I come across another of this
particular fixture type.
Arfa
news:kgm1i4$a4g$2@reader1.panix.com...
Discos were not confined to the 1970s. They still run now. In fact I was out
on one handling the lighting and visualizations for a friend, just this last
Saturday night gone ...
Anyways, I've fixed the bloody thing now, and I have to say that it had me
fooled. The problem turned out to be a knackered lamp socket. Looking closer
at the specs, it's actually 250 watts not 150 as I first thought, so even
with the forced air cooling it has, the lamp house runs pretty damned hot,
and the lamp socket with it. Basically, the ballast is not a very good
design. It doesn't run at all with no load on it, and as the lampholder was
effectively open circuit, it indeed didn't run, which was the first way that
it fooled me. The second way was that not only does it not run with no load,
it only runs properly with the full designed load. So when I had it out on
the bench, and just had a couple of 50 watt 12 v halogen lamps in series as
a test load, it ran, but only until the mains input voltage got to 160 v on
my variac. Once it went past that, the switching activity progressively
died, until it stopped altogether again.
I had a replacement ceramic holder to hand, as I fix a fair few of these
lighting fixtures, so I grafted it in, and reconnected the lamp wiring to
the ballast. This time, it kicked up and ran the lamp at full intensity
without issue, so that's one to remember if I come across another of this
particular fixture type.
Arfa
C
Cydrome Leader
Guest
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
you're just running lights, and had to shave 1% off the product cost.
foot flourescent light holders that take 2 or 4 bulbs if one bulb dies,
since there's so many types of ballasts.
I just replace both bulbs at once and toss the leftover into any fixture
that takes just one lamp. You never know if the other lamp was trashed
after the first one died. Some ballasts will just run the heaters nonstop
on the last bulb. Some flicker one bulb, some die completely.
ha, fucking europeans- disco, puma tracksuits, techno and communistm.
that is a pretty horrible power supply, but I guess it makes sense if
you're just running lights, and had to shave 1% off the product cost.
It's always a toss up as to what will happen in the US with the typical 4
foot flourescent light holders that take 2 or 4 bulbs if one bulb dies,
since there's so many types of ballasts.
I just replace both bulbs at once and toss the leftover into any fixture
that takes just one lamp. You never know if the other lamp was trashed
after the first one died. Some ballasts will just run the heaters nonstop
on the last bulb. Some flicker one bulb, some die completely.
C
Cydrome Leader
Guest
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
the joke (and sad truth) is disco never died in europe. All horrible
things last forever there.
the germans have some of the creapiest musicans that are still alive and
popular, like Fancy.
This one seemed to go over everyone's heads.
the joke (and sad truth) is disco never died in europe. All horrible
things last forever there.
the germans have some of the creapiest musicans that are still alive and
popular, like Fancy.
A
Arfa Daily
Guest
You *do* have an odd view of what it's like here ! Mobile discos did indeed
originate in the 70s, but have continued un-interupted ever since. They are
used for dances, in pubs, for birthday parties, weddings - all sorts of
things. The one that I was working at on Saturday, was a charity gig raising
money for cancer research. The technology has moved on over the years. When
I was first involved in the 70s, it was a pair of modified phono decks, a
preamp with a cross fader if you were lucky, a power amp, and a couple of
home-made cabs with the biggest speakers you could afford. Light shows were
done using modified slide projectors, home made colour wheels, made on the
fly likwid lite slides, and light columns made with Philips Photoflood
lamps. The music side of things gave way to twin CD decks, and the lighting
moved on to custom made pattern projectors using sound control to drive
rotating mirrors and dichroic filters. The music side is now all handled on
computer with custom pro software that looks after playlists, cross-fading,
inserting requests and storing the entire library. My friend has close to
8000 tracks on his setup. Lighting is now very complex, employing DMX and
sound controlled projectors, most of which are LED based, DMX and sound
controlled laser effects units, and computer generated 'visualisations',
which are math based music-synced patterns, fed to a video projector.
Puma tracksuits ? You don't see too many of them any more, not even on the
chaviest chavs ...
Techno ? Not really that big here any more. It came from America originally
anyway.
Communism ? Not too much of that in most of Europe any more, either.
Arfa
A
Arfa Daily
Guest
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:kgo93e$agp$5@reader1.panix.com...
Clearly, you don't understand the difference between 'Disco' and *a* disco
.... See my other reply
aren't. Being an island, our culture is rather different from that of
mainland Europeans, although politicians both sides of that watery divide
seem to have trouble comprehending that. We have some of the best musicians
in the world, and most of the rest of the world follows our lead ...
Arfa
news:kgo93e$agp$5@reader1.panix.com...
Clearly, you don't understand the difference between 'Disco' and *a* disco
.... See my other reply
Well, that's Germany for you. That's mainland Europe, which we in the uk,
aren't. Being an island, our culture is rather different from that of
mainland Europeans, although politicians both sides of that watery divide
seem to have trouble comprehending that. We have some of the best musicians
in the world, and most of the rest of the world follows our lead ...
Arfa
Guest
On Mon, 4 Mar 2013 23:36:09 +0000 (UTC), Cydrome Leader
<presence@MUNGEpanix.com> wrote:
<presence@MUNGEpanix.com> wrote:
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:kgo93e$agp$5@reader1.panix.com...
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:kglq1u$slf$3@reader1.panix.com...
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
Has anyone seen any good write-ups on, or figured out for themselves,
just
how the self-oscillating dirty - i.e. smoothing cap-less - switchers
that
you find in use as lamp ballasts (or 'electronic transformers' that
they
seem to be sometimes known as) work ?
I recently acquired a fairly sophisticated disco lighting fixture that
has
such a supply to run the 24v 150 watt lamp. It seems to have two main
switching devices, which I suspect are FETs or IGBTs, but can't tell
for
sure so far, as the numbers have been ground off them. On the mains
side,
That's pretty high tech for a product from the 1970s to use a switching
power supply.
1970s ? Where did you get that from ? It's actually about 4 or 5 years
old
at a guess ...
Arfa
This one seemed to go over everyone's heads.
the joke (and sad truth) is disco never died in europe. All horrible
things last forever there.
Clearly, you don't understand the difference between 'Disco' and *a* disco
... See my other reply
the germans have some of the creapiest musicans that are still alive and
popular, like Fancy.
Well, that's Germany for you. That's mainland Europe, which we in the uk,
aren't. Being an island, our culture is rather different from that of
mainland Europeans, although politicians both sides of that watery divide
seem to have trouble comprehending that. We have some of the best musicians
in the world, and most of the rest of the world follows our lead ...
It is safe to say good music comes out of the UK on a regular basis.
Bagpipes?
C
Cydrome Leader
Guest
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
It is safe to say good music comes out of the UK on a regular basis."Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:kgo93e$agp$5@reader1.panix.com...
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
"Cydrome Leader" <presence@MUNGEpanix.com> wrote in message
news:kglq1u$slf$3@reader1.panix.com...
In sci.electronics.repair Arfa Daily <arfa.daily@ntlworld.com> wrote:
Has anyone seen any good write-ups on, or figured out for themselves,
just
how the self-oscillating dirty - i.e. smoothing cap-less - switchers
that
you find in use as lamp ballasts (or 'electronic transformers' that
they
seem to be sometimes known as) work ?
I recently acquired a fairly sophisticated disco lighting fixture that
has
such a supply to run the 24v 150 watt lamp. It seems to have two main
switching devices, which I suspect are FETs or IGBTs, but can't tell
for
sure so far, as the numbers have been ground off them. On the mains
side,
That's pretty high tech for a product from the 1970s to use a switching
power supply.
1970s ? Where did you get that from ? It's actually about 4 or 5 years
old
at a guess ...
Arfa
This one seemed to go over everyone's heads.
the joke (and sad truth) is disco never died in europe. All horrible
things last forever there.
Clearly, you don't understand the difference between 'Disco' and *a* disco
... See my other reply
the germans have some of the creapiest musicans that are still alive and
popular, like Fancy.
Well, that's Germany for you. That's mainland Europe, which we in the uk,
aren't. Being an island, our culture is rather different from that of
mainland Europeans, although politicians both sides of that watery divide
seem to have trouble comprehending that. We have some of the best musicians
in the world, and most of the rest of the world follows our lead ...