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Today\'s Proceedings of the (US) National Academy of Sciences has this paper
https://www.pnas.org/content/pnas/early/2020/06/23/2006048117.full.pdf
Apparently if you spend time spelling out what exponential growth really means, even conservatives become more willing to take social distancing seriously.
It probably won\'t work on John Larkin who is really resistant to having things spelled out for him, and wouldn\'t work for Trump, who hasn\'t got a long enough attention span to let him absorb the message.
--
Bill Sloman, Sydney
Micron Dynamics claims that the technology is patented, so I sent an
email asking for patent numbers.
Joe Gwinn
Micron Dynamics claims that the technology is patented, so I sent an
email asking for patent numbers.
Joe Gwinn
On Wednesday, July 15, 2020 at 12:36:26 AM UTC-4, Ricketty C wrote:
I was thinking of using a green LED to limit a measured voltage on the ADC of an MCU.
In the distant past, I have NOT had much success with using diodes to clamp ADC inputs. (Unless you can afford to jettison 4 or 5 bits, or more, of resolution?) The last time I tried it, I found that the diodes (Zener\'s) really affected the voltage much too early in the curve and I couldn\'t calibrate it out with reasonable effort. I ended up just taking them out, for the much improved response.
But maybe that\'s not what you\'re doing here. (?)
And I don\'t think it is, so just mentioning the above.
As for green LED currents, we recently started using one that is amazingly bright at only 330 microamps. I\'ll send you the part# when I get to the office.
On Wednesday, July 15, 2020 at 12:36:26 AM UTC-4, Ricketty C wrote:
I was thinking of using a green LED to limit a measured voltage on the ADC of an MCU.
In the distant past, I have NOT had much success with using diodes to clamp ADC inputs. (Unless you can afford to jettison 4 or 5 bits, or more, of resolution?) The last time I tried it, I found that the diodes (Zener\'s) really affected the voltage much too early in the curve and I couldn\'t calibrate it out with reasonable effort. I ended up just taking them out, for the much improved response.
But maybe that\'s not what you\'re doing here. (?)
And I don\'t think it is, so just mentioning the above.
As for green LED currents, we recently started using one that is amazingly bright at only 330 microamps. I\'ll send you the part# when I get to the office.
On Wednesday, July 15, 2020 at 12:16:45 AM UTC-4, Bill Sloman wrote:
Today\'s Proceedings of the (US) National Academy of Sciences has this paper
https://www.pnas.org/content/pnas/early/2020/06/23/2006048117.full.pdf
Apparently if you spend time spelling out what exponential growth really means, even conservatives become more willing to take social distancing seriously.
It probably won\'t work on John Larkin who is really resistant to having things spelled out for him, and wouldn\'t work for Trump, who hasn\'t got a long enough attention span to let him absorb the message.
--
Bill Sloman, Sydney
Trying to \"educate\" people about exponential growth with an obtuse paper is not a good strategy. What is the takeaway in a couple of sentences?
On Wednesday, July 15, 2020 at 12:16:45 AM UTC-4, Bill Sloman wrote:
Today\'s Proceedings of the (US) National Academy of Sciences has this paper
https://www.pnas.org/content/pnas/early/2020/06/23/2006048117.full.pdf
Apparently if you spend time spelling out what exponential growth really means, even conservatives become more willing to take social distancing seriously.
It probably won\'t work on John Larkin who is really resistant to having things spelled out for him, and wouldn\'t work for Trump, who hasn\'t got a long enough attention span to let him absorb the message.
--
Bill Sloman, Sydney
Trying to \"educate\" people about exponential growth with an obtuse paper is not a good strategy. What is the takeaway in a couple of sentences?
Maybe I should just give in and limit the voltage with a Zener diode.
I was trying to keep a part off the BOM if possible. There\'s already
a green LED in use.
I think you will find a zener to be worse than a LED
Maybe I should just give in and limit the voltage with a Zener diode.
I was trying to keep a part off the BOM if possible. There\'s already
a green LED in use.
I think you will find a zener to be worse than a LED
On 7/15/2020 9:14 PM, Joe Gwinn wrote:
On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:
jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.
It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.
The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:
They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.
I used a blue LED projection as an indicator in a custom-built
product I made last year. The central unit is housed in a white
plastic box which is completely closed except for an antenna and
a USB port. Going by a last minute inspiration, I projected the
blue LED at the inside of the box from about 2cm away instead of
having it poke through the wall. The result is a diffused circle
of blue light. The customer loved it. The LED current is 1.5mA.
On 7/15/2020 9:14 PM, Joe Gwinn wrote:
On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:
jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.
It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.
The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:
They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.
I used a blue LED projection as an indicator in a custom-built
product I made last year. The central unit is housed in a white
plastic box which is completely closed except for an antenna and
a USB port. Going by a last minute inspiration, I projected the
blue LED at the inside of the box from about 2cm away instead of
having it poke through the wall. The result is a diffused circle
of blue light. The customer loved it. The LED current is 1.5mA.
Today\'s Proceedings of the (US) National Academy of Sciences has this paper
https://www.pnas.org/content/pnas/early/2020/06/23/2006048117.full.pdf
Apparently if you spend time spelling out what exponential growth really means, even conservatives become more willing to take social distancing seriously.
It probably won\'t work on John Larkin who is really resistant to having things spelled out for him, and wouldn\'t work for Trump, who hasn\'t got a long enough attention span to let him absorb the message.
--
Bill Sloman, Sydney
On Wednesday, July 15, 2020 at 12:47:46 PM UTC-4, Pimpom wrote:
On 7/15/2020 9:14 PM, Joe Gwinn wrote:
On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:
jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.
It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.
The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:
They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.
I used a blue LED projection as an indicator in a custom-built
product I made last year. The central unit is housed in a white
plastic box which is completely closed except for an antenna and
a USB port. Going by a last minute inspiration, I projected the
blue LED at the inside of the box from about 2cm away instead of
having it poke through the wall. The result is a diffused circle
of blue light. The customer loved it. The LED current is 1.5mA.
I think I\'ve seen clock that show their LEDs through a white plastic case. Blue LEDs behind white are very attractive I think. I much prefer blue LEDs to red ones.
On Wednesday, July 15, 2020 at 12:47:46 PM UTC-4, Pimpom wrote:
On 7/15/2020 9:14 PM, Joe Gwinn wrote:
On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:
jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.
It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.
The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:
They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.
I used a blue LED projection as an indicator in a custom-built
product I made last year. The central unit is housed in a white
plastic box which is completely closed except for an antenna and
a USB port. Going by a last minute inspiration, I projected the
blue LED at the inside of the box from about 2cm away instead of
having it poke through the wall. The result is a diffused circle
of blue light. The customer loved it. The LED current is 1.5mA.
I think I\'ve seen clock that show their LEDs through a white plastic case. Blue LEDs behind white are very attractive I think. I much prefer blue LEDs to red ones.
On Wednesday, July 15, 2020 at 12:47:46 PM UTC-4, Pimpom wrote:
On 7/15/2020 9:14 PM, Joe Gwinn wrote:
On 15 Jul 2020 14:32:46 GMT, Rob <nomail@example.com> wrote:
jlarkin@highlandsniptechnology.com <jlarkin@highlandsniptechnology.com> wrote:
One of my most common causes of writing ECOs against new designs is
that the LEDs are too bright. Gotta do that again today.
It is even more true for blue leds than for green. When a device
has a blue indicator LED, it usually is far too bright. Both my PC
and my router have indicator lights that, when not taped over, cause
a large blue spot to appear on the opposite wall.
The best use of this I\'ve seen is Bosch dishwashers, the models that
have no visible controls or indicators when the door is closed:
They use a blue LED to project a spot on the floor - if the spot is
steady, the diswasher is happily progressing through its cycle. If
blinking, go figure out why.
I used a blue LED projection as an indicator in a custom-built
product I made last year. The central unit is housed in a white
plastic box which is completely closed except for an antenna and
a USB port. Going by a last minute inspiration, I projected the
blue LED at the inside of the box from about 2cm away instead of
having it poke through the wall. The result is a diffused circle
of blue light. The customer loved it. The LED current is 1.5mA.
I think I\'ve seen clock that show their LEDs through a white plastic case. Blue LEDs behind white are very attractive I think. I much prefer blue LEDs to red ones.
Conical antennas are known for being rather wide-band.Am 14.07.20 um 15:01 schrieb Phil Hobbs:
So I was chatting with my local Mini Circuits rep, who also handles
Gowanda. He asked if I was interested in conical inductors, which I
certainly am, and how much I wanted to pay for them.
Remembering that JL had said that the Coilcraft patent had expired, I
said \"forty cents in reels\".
Turns out that Gowanda won\'t go below $10 apiece in reels. I pointed
out that I mostly wanted to use it with BFP640s and really wasn\'t
going to use a $10 inductor to decouple a 20-cent
transistor--especially since I can use series-connected 0201/0402/0603
inductors and beads to do almost as good a job, for $0.12 total.
Those things are just ordinary ferrite or powdered iron, wound with
ordinary copper, and can\'t be that hard to make, so once the patent(s)
expire, it\'s hard to imagine how they can maintain that pricing level.
What gives, do you suppose?
The patent was one of Piconic\'s. IIRC they asked for $/⬠30
10Â years ago when I was with Infineon fiber optics. I then told the
Mini Circuits rep that they might sell a bias tee for every ERA-1
if it was cheap enough and soon they had bias tees and/or \'flying\'
inductors. I don\'t claim it\'s been because of me. But the solution
with cascaded Ls was still so much cheaper that we couldn\'t help
but using them.
It just takes some hours of experimenting with the VNA and you get
it flat to 20 GHz, with an ordinary 100n AVX 0402 capacitor.
A friend of mine put some ferrite into a mortar, pulverized it,
mixed it with epoxy and put it into a form made from clay? or
whatever and a color pen. Then he wound the coil while it still was
somewhat sticky. Ugly as hell, but it worked perfectly.
Cheers, Gerhard
Conical antennas are known for being rather wide-band.Am 14.07.20 um 15:01 schrieb Phil Hobbs:
So I was chatting with my local Mini Circuits rep, who also handles
Gowanda. He asked if I was interested in conical inductors, which I
certainly am, and how much I wanted to pay for them.
Remembering that JL had said that the Coilcraft patent had expired, I
said \"forty cents in reels\".
Turns out that Gowanda won\'t go below $10 apiece in reels. I pointed
out that I mostly wanted to use it with BFP640s and really wasn\'t
going to use a $10 inductor to decouple a 20-cent
transistor--especially since I can use series-connected 0201/0402/0603
inductors and beads to do almost as good a job, for $0.12 total.
Those things are just ordinary ferrite or powdered iron, wound with
ordinary copper, and can\'t be that hard to make, so once the patent(s)
expire, it\'s hard to imagine how they can maintain that pricing level.
What gives, do you suppose?
The patent was one of Piconic\'s. IIRC they asked for $/⬠30
10Â years ago when I was with Infineon fiber optics. I then told the
Mini Circuits rep that they might sell a bias tee for every ERA-1
if it was cheap enough and soon they had bias tees and/or \'flying\'
inductors. I don\'t claim it\'s been because of me. But the solution
with cascaded Ls was still so much cheaper that we couldn\'t help
but using them.
It just takes some hours of experimenting with the VNA and you get
it flat to 20 GHz, with an ordinary 100n AVX 0402 capacitor.
A friend of mine put some ferrite into a mortar, pulverized it,
mixed it with epoxy and put it into a form made from clay? or
whatever and a color pen. Then he wound the coil while it still was
somewhat sticky. Ugly as hell, but it worked perfectly.
Cheers, Gerhard