signal indicator

On 5/13/19 3:18 PM, Joerg wrote:
On 2019-05-09 17:46, Clifford Heath wrote:
On 10/5/19 5:16 am, Joerg wrote:
On 2019-05-05 10:51, Phil Hobbs wrote:
On 5/5/19 10:10 AM, Joerg wrote:
On 2019-05-04 13:58, John Larkin wrote:
On Sat, 04 May 2019 12:13:26 -0700, Joerg
news@analogconsultants.com
wrote:

On 2019-05-04 08:31, John Larkin wrote:

[...]


If I use a Hittite HMC987 fanout chip, I can use one of its diff
ECL
outputs just for the monitor LED, and I can load that as hard as I
like.

https://www.dropbox.com/s/avw42lia7ejayug/Sig_Indicator_3.JPG?dl=0

That Hittite chip is $20.


Ouch!

It's wonderful. If it helps me sell a bunch of $1500 boxes, it's a
bargain. The CML comparator ahead of it costs almost as much.

We're looking at some distributed amplifier chips in the $200-400
range, and some fast logic gates for $70 each.


Yes, but to say it like a greedy Wall Street banker, how much higher
could the profit have been?

No kidding, I had projects where stuff retailed well north of $100,
the per unit cost was $10 and the client asked "Could we do it for
$5?". So we did.


We do an ultralow noise digital laser controller with a BOM cost of $37
including the board and connectors, excluding the diode laser and the
optomechanics.  It replaces a $3500 purchased laser.  It's way more fun
doing stuff for cheap like that.


Yes! I am helping with a similar project (not laser) right now. Most
engineers roll their eyes when a boss or a manager asks "Can we shave
another $2 from the BOM"? With me my eyes light up, it's fun.

Right now I had to pause, can't visit the client. The handlebar of my
road bike snapped off at full speed during an after-church ride and ...


Yowsers, that sounds intense, I'm glad you're still able to type.


Well, it's been a week now and still hobbling around. Can't work much.
Hopefully the left foot will heal up. OTOH I am glad this didn't happen
1/2h earlier where I was roaring down a steep hill at 42mph with big
pointy boulders on the side and a T-intersection into a busy road at the
end of this hill.

The other good thing was that three drivers stopped and almost got into
an argument about who gets to take me and my bike home, despite me
bleeding a lot. There are many good people in our society. There was no
way I could have made it home by myself.

And you're doing this for your health. :(

May God heal and protect you.

Cheers

Phil
 
tirsdag den 14. maj 2019 kl. 00.26.53 UTC+2 skrev Phil Hobbs:
On 5/13/19 3:18 PM, Joerg wrote:
On 2019-05-09 17:46, Clifford Heath wrote:
On 10/5/19 5:16 am, Joerg wrote:
On 2019-05-05 10:51, Phil Hobbs wrote:
On 5/5/19 10:10 AM, Joerg wrote:
On 2019-05-04 13:58, John Larkin wrote:
On Sat, 04 May 2019 12:13:26 -0700, Joerg
news@analogconsultants.com
wrote:

On 2019-05-04 08:31, John Larkin wrote:

[...]


If I use a Hittite HMC987 fanout chip, I can use one of its diff
ECL
outputs just for the monitor LED, and I can load that as hard as I
like.

https://www.dropbox.com/s/avw42lia7ejayug/Sig_Indicator_3.JPG?dl=0

That Hittite chip is $20.


Ouch!

It's wonderful. If it helps me sell a bunch of $1500 boxes, it's a
bargain. The CML comparator ahead of it costs almost as much.

We're looking at some distributed amplifier chips in the $200-400
range, and some fast logic gates for $70 each.


Yes, but to say it like a greedy Wall Street banker, how much higher
could the profit have been?

No kidding, I had projects where stuff retailed well north of $100,
the per unit cost was $10 and the client asked "Could we do it for
$5?". So we did.


We do an ultralow noise digital laser controller with a BOM cost of $37
including the board and connectors, excluding the diode laser and the
optomechanics.  It replaces a $3500 purchased laser.  It's way more fun
doing stuff for cheap like that.


Yes! I am helping with a similar project (not laser) right now. Most
engineers roll their eyes when a boss or a manager asks "Can we shave
another $2 from the BOM"? With me my eyes light up, it's fun.

Right now I had to pause, can't visit the client. The handlebar of my
road bike snapped off at full speed during an after-church ride and ....


Yowsers, that sounds intense, I'm glad you're still able to type.


Well, it's been a week now and still hobbling around. Can't work much.
Hopefully the left foot will heal up. OTOH I am glad this didn't happen
1/2h earlier where I was roaring down a steep hill at 42mph with big
pointy boulders on the side and a T-intersection into a busy road at the
end of this hill.

The other good thing was that three drivers stopped and almost got into
an argument about who gets to take me and my bike home, despite me
bleeding a lot. There are many good people in our society. There was no
way I could have made it home by myself.

And you're doing this for your health. :(

May God heal and protect you.

the neurosurgeons have gotten a great deal of practice since middle age men started mountain biking, and breaking their neck ...
 
On 14/5/19 8:26 am, Phil Hobbs wrote:
On 5/13/19 3:18 PM, Joerg wrote:

The other good thing was that three drivers stopped and almost got
into an argument about who gets to take me and my bike home, despite
me bleeding a lot. There are many good people in our society. There
was no way I could have made it home by myself.
And you're doing this for your health. :(
Well, mental health is important too (reinforced by finding good people
around). Perhaps even more important than physical health, in these
crazy days of doom and despots.
 
On 14/5/19 5:18 am, Joerg wrote:
Absolutely nothing. It just snapped out of the blue, like in his case:
https://www.youtube.com/watch?v=dPEfiN0s-KA

Comments there say it didn't break, but was attached with the wrong
bolts and came loose on a bump. All the same... scary!
It seems like a thin steel insert (liner tube) inside the centre of an
Al bar could at least fail softly - it would probably be lighter overall
too.

Clifford Heath
 
On a sunny day (Mon, 13 May 2019 13:07:32 -0700) it happened John Larkin
<jjlarkin@highland_snip_technology.com> wrote in
<7ajjdeth00dd2l77cccvnpaet1g956gg89@4ax.com>:

That's cute. A small bypassed resistor from gate ground pin to PCB
ground will make a small voltage that can feed two comparators. A few
tenths of a volt there won't bother anything. It could be done on the
high side too, let Vcc droop a bit as frequency goes up.

Nice idea, as long as it's a CMOS gate and not ECL.

It's a charge dispenser.

After all the ideas I would use a cheap PIC on both sides.
I have the code for frequency counter
if > 4 MHz led1 done
else if > 3.5 MHz led2 done
else if > 3 MHz led1 + led2 done
else of > 2.5 MHz all off done

18F14K22 internal clock PLLs to 65 MHz, software loop can generate the frequencies,
Even the very cheap ones have 2 hardware comparators to detect the RF.
As many LEDs / output as you have spare pins.
And flexible, can add function later, standard part, good availability.
Unless you live on food stamps the price would be insignificant for small series.
Coding time would be less than Usenet time ;-)
 

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