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JosephKK · Guest

On Mon, 23 Jun 2008 13:57:06 -0700, John Larkin
<jjlarkin@highNOTlandTHIStechnologyPART.com> wrote:

[quote]On Mon, 23 Jun 2008 13:00:04 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Ok, guys, we had a thread about NXP>s site a while ago. Long story short
I wrote to them and, surprise, they engaged in a lively back-and-forth
improvement session and really listened. They changed a lot of stuff,
got rid of fluff and while not perfect yet I think the NXP site has
improved quite a bit. Heck, now you can even use it with Java Script
turned off (gets rid of the nag screen). And no, I am not paid by them,
just got involved because I didn>t want to see a company that was good
to me go down the tubes.

http://www.nxp.com/indexnc.html

So what do thee think?

Better. I use Flashblock, and it doesn>t even try anything tricky. The
structure is still pretty weird, though.

What is the "switch to classic mode/switch to liquid mode" thing at
the bottom?

And "contact" should just provide email addresses, not the dumb form
to fill out.

At least they still offer the wideband transistors!

John
[/quote]
There is a good reason for the contact form. You are expected to see
that when you think about that.

Baron · Guest

JosephKK wrote:

[quote]On Mon, 23 Jun 2008 13:00:04 -0700, Joerg
notthisjoergsch@removethispacbell.net> wrote:

Ok, guys, we had a thread about NXP>s site a while ago. Long story
short I wrote to them and, surprise, they engaged in a lively
back-and-forth improvement session and really listened. They changed a
lot of stuff, got rid of fluff and while not perfect yet I think the
NXP site has improved quite a bit. Heck, now you can even use it with
Java Script turned off (gets rid of the nag screen). And no, I am not
paid by them, just got involved because I didn>t want to see a company
that was good to me go down the tubes.

http://www.nxp.com/indexnc.html

So what do thee think?
[/quote]
Clicking on product in the left side of the frame gives a list
underneath the frame. The top line gets hidden underneath the edge of
the frame. It isn>t always clickable !

Otherwise its much better !

--
Best Regards:
Baron.

Rene Tschaggelar · Guest

Joerg wrote:
[quote]Ok, guys, we had a thread about NXP>s site a while ago. Long story short
I wrote to them and, surprise, they engaged in a lively back-and-forth
improvement session and really listened. They changed a lot of stuff,
got rid of fluff and while not perfect yet I think the NXP site has
improved quite a bit. Heck, now you can even use it with Java Script
turned off (gets rid of the nag screen). And no, I am not paid by them,
just got involved because I didn>t want to see a company that was good
to me go down the tubes.

http://www.nxp.com/indexnc.html

So what do thee think?

[/quote]
Joerg,
Great, my congrat for making them listen.

Rene
--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net

JosephKK · Guest

On Sat, 28 Jun 2008 23:46:05 +0200, Rene Tschaggelar <none@none.net>
wrote:

[quote]Joerg wrote:
Ok, guys, we had a thread about NXP>s site a while ago. Long story short
I wrote to them and, surprise, they engaged in a lively back-and-forth
improvement session and really listened. They changed a lot of stuff,
got rid of fluff and while not perfect yet I think the NXP site has
improved quite a bit. Heck, now you can even use it with Java Script
turned off (gets rid of the nag screen). And no, I am not paid by them,
just got involved because I didn>t want to see a company that was good
to me go down the tubes.

http://www.nxp.com/indexnc.html

So what do thee think?

Joerg,
Great, my congrat for making them listen.

Rene
[/quote]
Hear, hear.

NoSp · Guest

On Jun 24, 2:35 pm, Rich Webb <bbew...@mapson.nozirev.ten> wrote:
[quote]On Tue, 24 Jun 2008 10:42:34 +0200, NoSp <N...@void.none.empty> wrote:

Should I connect something like a caramic capacitor across each of the
relay>s switch connections? Which capacitance values are we talking?

Just swagging this: The 12 V shouldn>t care; the drive motor isn>t spun
until after the drive electronics start up. On the 5 V rail, it looks
like a typical modern drive initially pulls about 300 mA. Hand-waving a
power interrupt time during contact bounce at around 1 ms, to hold the
droop on 5 V to < 10% would require about 600 uF.
[/quote]
So a 600uF ceramic capacitor (or similar) across the 5V switched lines
of the relay?
Sounds good.

Something else comes to mind. Since I>ll have two separate on/off
switches there is a chance that I may power up the enclosure without
putting much load on the power supply. I>ve heard that this is a bad
thing for switched mode power supplies.
The dual-SATA to Firewire/USB bridge board will of course be directly
connected to the PSU, so when I flip the enclosure>s power switch
it>ll draw some power (I>m not sure how much, but I do know that it
only uses the +5V line, which leaves the +12V line unused).
I do however plan to put a fan inside the enclosure, but through some
sort of temperature controlling circuitry so as to keep the noise
level down, so I don>t know how this will affect the PSU.
Is this something I should be concerned about?

Michael · Guest

CptDondo wrote:
[quote]
Anyone have a source for really bright IR (~900-950 nm wavelength) LEDs?

I>m trying to build a night camera. I>ve got the camera modified to see
in that wavelength but the 16 normal (20 ma) LEDs just don>t provide
enough light. I could just build a whole sh*tload of 20 ma LED lights
but maybe if someone knows of some brighter ones I could save some
work....

I am trying to illuminate an area of about 12x30" from a distance of 18".

--Yan
[/quote]

Plain ol' ~20ma IR LEDs from All Electronics worked for me. I built a board of
2 banks x 6-series-LEDs and mounted that alongside a nothing-special miniature
CCD camera (not web cam though), about 3-4 feet away from the subject. Viewed
area was approx. 4ft square (maybe as much as 4x5 ft.)

Kevin Criqui · Guest

Quick follow up. I never did find 27.12MHz oscillators, but Mouser has
27.12MHz crystals in stock right now. It says NON STANDARD VALUE so I>m
guessing they won>t get more when the current stock runs out.

http://www.mouser.com/Search/ProductDetail.aspx?qs=v0cjL%2fPx3nwYb72W1t17Ag%3d%3d

Kevin

Lasers In Mind · Guest

Kevin Criqui wrote:
[quote]Quick follow up. I never did find 27.12MHz oscillators, but Mouser has
27.12MHz crystals in stock right now. It says NON STANDARD VALUE so I>m
guessing they won>t get more when the current stock runs out.

http://www.mouser.com/Search/ProductDetail.aspx?qs=v0cjL%2fPx3nwYb72W1t17Ag%3d%3d

Kevin
[/quote]
Try 27.125 It>s an old CB frequency. You should be able
to pull it over to 27.12

Leon · Guest

On 22 Sep, 22:14, DJ Delorie <d...@delorie.com> wrote:
[quote]Eeyore <rabbitsfriendsandrelati...@hotmail.com> writes:
Similar kind of thing. Except I only need a handful !

Next time someone tells me I>m wasting my time making my own boards,
I>m going to point them at this thread :-)

Last time this came up, it got me thinking. I can etch on 8 mil FR4,
and double-stick tape that to an unetched copper clad board, to get
what I think you>re asking for. But, not being an RF expert, I have
no idea how well it would "work". I think it would be worth the
effort to find out if this is a viable RF prototyping platform, just
to satisfy my curiosity, if you can send me a PDF of a SS layout (no
vias ;). Contact me off-list if you>re interested.

DJ
[/quote]
That technique works very well. Someone mentioned the Wainwright
system, which is basically the same - they were sometimes used at
Racal Comms for RF prototypes when I worked there. I>ve used it
myself, etching the carriers at home.

Leon

Leon · Guest

On 22 Sep, 22:14, DJ Delorie <d...@delorie.com> wrote:
[quote]Eeyore <rabbitsfriendsandrelati...@hotmail.com> writes:
Similar kind of thing. Except I only need a handful !

Next time someone tells me I>m wasting my time making my own boards,
I>m going to point them at this thread :-)

Last time this came up, it got me thinking. I can etch on 8 mil FR4,
and double-stick tape that to an unetched copper clad board, to get
what I think you>re asking for. But, not being an RF expert, I have
no idea how well it would "work". I think it would be worth the
effort to find out if this is a viable RF prototyping platform, just
to satisfy my curiosity, if you can send me a PDF of a SS layout (no
vias ;). Contact me off-list if you>re interested.

DJ
[/quote]
That technique works very well. Someone mentioned the Wainwright
system, which is basically the same - they were sometimes used at
Racal Comms for RF prototypes when I worked there. I>ve used it
myself, etching the carriers at home.

Leon

JosephKK · Guest

On Mon, 22 Sep 2008 18:36:09 +0100, Eeyore
<rabbitsfriendsandrelations@hotmail.com> wrote:

[quote]Now, only a little while back I said I never breadboard, I go straight
to pcb.

This one>s different though. The client wants to do the layout as part
of a larger scheme and I want to be double sure of stability in practice
as opposed to simulation because if he messes up, I can show mine
working fine.

As I>ll be using a 65MHz ? op-amp I don>t trust perfboard / Veroboard
for this.

I recall some self adhesive 'pre-etched shapes' that you could stick on
a ground plane. The name Wainwright comes to mind but google isn>t
helping much.

Any suggestions ?

Graham
[/quote]
Actually a small lot quick turn shop sounds in order here. Unless you
desire to prove that you can make it work on perfboard (kludgeboard)
prototype don>t bother. This client wants "professional look"
immediately. Disappoint at your own hazard.

Leon · Guest

On 2 Oct, 14:37, Eeyore <rabbitsfriendsandrelati...@hotmail.com>
wrote:
[quote]Leon wrote:
On 22 Sep, 22:14, DJ Delorie <d...@delorie.com> wrote:
Eeyore <rabbitsfriendsandrelati...@hotmail.com> writes:
Similar kind of thing. Except I only need a handful !

Next time someone tells me I>m wasting my time making my own boards,
I>m going to point them at this thread :-)

Last time this came up, it got me thinking. I can etch on 8 mil FR4,
and double-stick tape that to an unetched copper clad board, to get
what I think you>re asking for. But, not being an RF expert, I have
no idea how well it would "work". I think it would be worth the
effort to find out if this is a viable RF prototyping platform, just
to satisfy my curiosity, if you can send me a PDF of a SS layout (no
vias ;). Contact me off-list if you>re interested.

That technique works very well. Someone mentioned the Wainwright
system, which is basically the same - they were sometimes used at
Racal Comms for RF prototypes when I worked there. I>ve used it
myself, etching the carriers at home.

Yes it was the Wainwright system I had in mind but I can find no info on
the web.

Graham
[/quote]
They were extremely expensive for little blank PCBs with double-sided
tape on the back. I liberated a few from the lab for my own use when I
was at Racal.

Leon

Eeyore · Guest

JosephKK wrote:

[quote]Eeyore wrote:

Now, only a little while back I said I never breadboard, I go straight
to pcb.

This one>s different though. The client wants to do the layout as part
of a larger scheme and I want to be double sure of stability in practice
as opposed to simulation because if he messes up, I can show mine
working fine.

As I>ll be using a 65MHz ? op-amp I don>t trust perfboard / Veroboard
for this.

I recall some self adhesive 'pre-etched shapes' that you could stick on
a ground plane. The name Wainwright comes to mind but google isn>t
helping much.

Actually a small lot quick turn shop sounds in order here. Unless you
desire to prove that you can make it work on perfboard (kludgeboard)
prototype don>t bother. This client wants "professional look"
immediately. Disappoint at your own hazard.
[/quote]
Ah, well the client wouldn>t be getting it. It was more for my own peace of
mind. Plus it>s a sort of freebie job in return for a favour thing so don>t
want to spend much money on it.

Graham

Eeyore · Guest

Leon wrote:

[quote]On 22 Sep, 22:14, DJ Delorie <d...@delorie.com> wrote:
Eeyore <rabbitsfriendsandrelati...@hotmail.com> writes:
Similar kind of thing. Except I only need a handful !

Next time someone tells me I>m wasting my time making my own boards,
I>m going to point them at this thread :-)

Last time this came up, it got me thinking. I can etch on 8 mil FR4,
and double-stick tape that to an unetched copper clad board, to get
what I think you>re asking for. But, not being an RF expert, I have
no idea how well it would "work". I think it would be worth the
effort to find out if this is a viable RF prototyping platform, just
to satisfy my curiosity, if you can send me a PDF of a SS layout (no
vias ;). Contact me off-list if you>re interested.

That technique works very well. Someone mentioned the Wainwright
system, which is basically the same - they were sometimes used at
Racal Comms for RF prototypes when I worked there. I>ve used it
myself, etching the carriers at home.
[/quote]
Yes it was the Wainwright system I had in mind but I can find no info on
the web.

Graham


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