Commander Kinsey wrote

Is it to warn you?

No idea what you are on about this time.

Even my toilet cistern can slow down smoothly.

Rather different technology. Many dimmers cant,
they cut off abruptly at the lower light levels.

On Tue, 4 May 2021 04:23:43 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the two subnormal sociopathic cretins' endless absolutely idiotic
blather

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Birdbrain: "I've never worked out why, I assumed it was maybe meateaters
that made stinky ****, but then why does vegetarian human **** stink? Is it
just the fact that we're capable of digesting meat?"

Senile Rodent: "Nope, some cow **** stinks too."

Message-ID:

On 4/05/21 6:36 am, Peeler wrote:
On Tue, 4 May 2021 04:23:43 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the two subnormal sociopathic cretins' endless absolutely idiotic
blather



Peeler's eyes are simple eyespots, not lensed eyes that can resolve images.

Never saw the original post. There is a holding current in a triac, and once
the current drops below this a kind of Hysteresis occurs so you need to turn
it up to get it conducting again.
Brian

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"Rod Speed" wrote in message
...
Commander Kinsey wrote
Is it to warn you?

No idea what you are on about this time.
Even my toilet cistern can slow down smoothly.

Rather different technology. Many dimmers cant,
they cut off abruptly at the lower light levels.

Brian Gaff (Sofa) wrote

Never saw the original post.

He ****ed up uk.d-I-y he had uk.diy

There is a holding current in a triac, and once the current drops below
this a kind of Hysteresis occurs so you need to turn it up to get it
conducting again.

leds don’t dim using triacs but still cant be dimmed right down close
to zero for use as a nightlight with the philips hues particularly.

Rod Speed wrote
Commander Kinsey wrote
Is it to warn you?

No idea what you are on about this time.
Even my toilet cistern can slow down smoothly.

Rather different technology. Many dimmers cant,
they cut off abruptly at the lower light levels.

On Tue, 4 May 2021 16:36:59 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the trolling senile asshole's latest troll**** unread

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On 4/05/21 7:29 pm, Peeler wrote:
On Tue, 4 May 2021 16:36:59 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the trolling senile asshole's latest troll**** unread



Peeler has no true fins and has six or eight barbels around the mouth
and a single nostril.

OK what do they use then, All I remember from my brief experience trying to
dim leds was that the most successful way of doing that was by duty cycle,
ie on to off times with them driven by some kind of oscillator with variable
mark space ratios. However it is obvious that even the briefest of ons and
the longest offs tends to still be visible in most cases, and not terribly
accurate if many leds are used as the load, there being a spread of
linearity in any given number.
Brian

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This newsgroup posting comes to you directly from...
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Note this Signature is meaningless.!
"Rod Speed" wrote in message
...
Brian Gaff (Sofa) wrote

Never saw the original post.

He ****ed up uk.d-I-y he had uk.diy

There is a holding current in a triac, and once the current drops below
this a kind of Hysteresis occurs so you need to turn it up to get it
conducting again.

leds don’t dim using triacs but still cant be dimmed right down close
to zero for use as a nightlight with the philips hues particularly.

Rod Speed wrote
Commander Kinsey wrote
Is it to warn you?

No idea what you are on about this time.
Even my toilet cistern can slow down smoothly.

Rather different technology. Many dimmers cant,
they cut off abruptly at the lower light levels.

Brian Gaff (Sofa) wrote

OK what do they use then,

A controlled current regulator.

All I remember from my brief experience trying to dim leds was that the
most successful way of doing that was by duty cycle, ie on to off times
with them driven by some kind of oscillator with variable mark space
ratios.

It is much better to control the current thru the leds.

And it makes no sense to use a triac when varying
the mark/space ratio with leds anyway.

However it is obvious that even the briefest of ons and the longest offs
tends to still be visible in most cases,

That’s mad, leds have very little inertia.

and not terribly accurate if many leds are used as the load, there being a
spread of linearity in any given number.

That would be a mad approach too.

Rod Speed wrote
Brian Gaff (Sofa) wrote

Never saw the original post.

He ****ed up uk.d-I-y he had uk.diy

There is a holding current in a triac, and once the current drops below
this a kind of Hysteresis occurs so you need to turn it up to get it
conducting again.

leds don’t dim using triacs but still cant be dimmed right down close
to zero for use as a nightlight with the philips hues particularly.

Rod Speed wrote
Commander Kinsey wrote
Is it to warn you?

No idea what you are on about this time.
Even my toilet cistern can slow down smoothly.

Rather different technology. Many dimmers cant,
they cut off abruptly at the lower light levels.

On Wed, 5 May 2021 02:31:42 +1000, cantankerous trolling geezer Rodent
Speed, the auto-contradicting senile sociopath, blabbered, again:

FLUSH the trolling senile asshole's latest troll**** unread

02:31??? AGAIN? Is your senility not letting you sleep in again, you
abnormal senile troll?

--
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cretin's pathological trolling:
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On 04/05/2021 13:23, Brian Gaff (Sofa) wrote:
OK what do they use then, All I remember from my brief experience trying to
dim leds was that the most successful way of doing that was by duty cycle,
ie on to off times with them driven by some kind of oscillator with variable
mark space ratios. However it is obvious that even the briefest of ons and
the longest offs tends to still be visible in most cases, and not terribly
accurate if many leds are used as the load, there being a spread of
linearity in any given number.

PWM is the cheapest way as it needs no other component.

For a small improvement in efficiency then a constant current source
would be best but obviously costs more.

"Fredxx" wrote in message
...
On 04/05/2021 13:23, Brian Gaff (Sofa) wrote:
OK what do they use then, All I remember from my brief experience trying
to
dim leds was that the most successful way of doing that was by duty
cycle,
ie on to off times with them driven by some kind of oscillator with
variable
mark space ratios. However it is obvious that even the briefest of ons
and
the longest offs tends to still be visible in most cases, and not
terribly
accurate if many leds are used as the load, there being a spread of
linearity in any given number.

PWM is the cheapest way as it needs no other component.

For a small improvement in efficiency then a constant current source would
be best but obviously costs more.

Doesnt necessarily cost anything more at all with leds. Same price as
voltage regulators.

On 04/05/2021 17:38, Fredxx wrote:
On 04/05/2021 13:23, Brian Gaff (Sofa) wrote:

OK what do they use then, All I remember from my brief experience
trying to
dim leds was that the most successful way of doing that was by duty
cycle,
ie on to off times with them driven by some kind of oscillator with
variable
mark space ratios. However it is obvious that even the briefest of ons
and
the longest offs tends to still be visible in most cases, and not
terribly
accurate if many leds are usedÂ* as the load, there being a spread of
linearity in any given number.

PWM is the cheapest way as it needs no other component.

Yes, I made a PWM dimmer circuit (for fun) based on circuits I found on
the Internet and it works well, and dims to nothingness. (12VDC working
a white LED strip.)

--
Max Demian

On Mon, 03 May 2021 19:23:43 +0100, Rod Speed wrote:

Commander Kinsey wrote

Is it to warn you?

No idea what you are on about this time.

It's obvious what I meant, the car warns the driver he's revving too high by making the engine jump on and off.

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Sent from my iPhone, this spam courtesy of Apple incorporated.

On 03/05/2021 19:23, Rod Speed wrote:
Commander Kinsey wrote
Is it to warn you?

No idea what you are on about this time.
Even my toilet cistern can slow down smoothly.

Rather different technology. Many dimmers cant,
they cut off abruptly at the lower light levels.

The only dimmer around here is you.