John,
At 09:57 AM 4/3/2004 +1000, Harry Lemmens wrote:
>On some prox antenna stuff I did years ago, I found that the series
>tuning/coupling capacitor was the critical element. If I used a common "garden
>variety" SMD capacitor, there was about 70 volts across the coil. When I changed
>to a "Low
ays blame the antenna inductance
of you are having trouble ...
Cheers
Harry
-Original Message-
From: John C. Echols [mailto:[EMAIL PROTECTED]
Sent: Saturday, April 03, 2004 10:42 AM
To: Protel EDA Forum
Subject: Re: [PEDA] Antenna coil
The App Note looks interesting. Since I'
The App Note looks interesting. Since I've never even wound a coil until last week
I'm sort of winging it.
Hadn't thought about the DC Resistance but I'm stuck with the 4 X 4 spacing to fit
the room on the board.
If it works I'll save $2-4 per assembly with the "free" antenna, so it's worth a
try
At 29-03-2004 12:56, [EMAIL PROTECTED] wrote:
In a message dated 2004-03-28 03:33:51 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
>..The coil is about 3.25 X 4.25", 700uHy and takes 60 turns of mag
wire. Can I do this with traces?
You can. EM does it in their proximity reader r
On 08:56 PM 29/03/2004, [EMAIL PROTECTED] said:
In a message dated 2004-03-28 03:33:51 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
> I'm the guy still using Protel 1.61 (1992) with Windows 3.11 and I'm on
> a phone linenow that you're through laughing my question is - my
> present proje
In a message dated 2004-03-28 03:33:51 PM Eastern Standard Time,
[EMAIL PROTECTED] writes:
> I'm the guy still using Protel 1.61 (1992) with Windows 3.11 and I'm on
> a phone linenow that you're through laughing my question is - my
> present project requires a coil for an antenna for a "prox
I never sleep
John
> -Original Message-
> From: Brian Guralnick [mailto:[EMAIL PROTECTED]
> Sent: Sunday, March 28, 2004 11:56 PM
> To: Protel EDA Forum
> Subject: Re: [PEDA] Antenna coil
>
> > For spirals you could try Brians script as well for drafti
[PEDA] Antenna coil
I'm the guy still using Protel 1.61 (1992) with Windows 3.11 and I'm on
a phone linenow that you're through laughing my question is - my
present project requires a coil for an antenna for a "prox" card
reader. The coil is about 3.25 X 4.25", 70
TECTED]>
Sent: Sunday, March 28, 2004 4:18 PM
Subject: Re: [PEDA] Antenna coil
> you may try to design a spiral inductor instead . Download the free
> software called Appcad (from Agilent) , it has spiral inductors design.
Play
> some what if scenarios with it and you'll see if yo
PM
> To: Protel EDA Forum
> Subject: Re: [PEDA] Antenna coil
>
> you may try to design a spiral inductor instead . Download
> the free software called Appcad (from Agilent) , it has
> spiral inductors design. Play some what if scenarios with it
> and you'll see if you can
l Message -
From: "John C. Echols" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, March 28, 2004 3:32 PM
Subject: [PEDA] Antenna coil
> I'm the guy still using Protel 1.61 (1992) with Windows 3.11 and I'm on
> a phone linenow that you're th
MSEE
- Original Message -
From: "John C. Echols" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, March 28, 2004 3:32 PM
Subject: [PEDA] Antenna coil
> I'm the guy still using Protel 1.61 (1992) with Windows 3.11 and I'm on
> a phone linenow that
Sorry, that should be 41 turns using .10" for coil length when using mag
wire. Changing to .032 for coil length (PCB) has little effect.
John Echols
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I'm the guy still using Protel 1.61 (1992) with Windows 3.11 and I'm on
a phone linenow that you're through laughing my question is - my
present project requires a coil for an antenna for a "prox" card
reader. The coil is about 3.25 X 4.25", 700uHy and takes 60 turns of
mag wire. Can I do thi
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