S
starfire
Guest
I've know 27R on a resistor is 27 ohms but what is 300R on an inductor? Is
it 300uH?
Dave
it 300uH?
Dave
Navigation
Install the app
How to install the app on iOS
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
More options
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
P
Peter Dettmann
Guest
On Mon, 19 Jan 2009 11:16:06 -0700, "starfire"
<starfire151@cableone.net> wrote:
peter
<starfire151@cableone.net> wrote:
Did you measure the resistance of this 'inductor' ?I've know 27R on a resistor is 27 ohms but what is 300R on an inductor? Is
it 300uH?
Dave
peter
S
starfire
Guest
"Peter Dettmann" <peter@aardvark.net.au> wrote in message
news:3ilcn4la9cogv8elodsun1l97jucj9hk0l@4ax.com...
an inductor and not a resistor. The value is associated with the lines
going to the power leads of a USB connector (the +%VDC and the Gnd lines).
Dave
news:3ilcn4la9cogv8elodsun1l97jucj9hk0l@4ax.com...
Its on a schematic and I don't have access to the circuit. It is drawn asOn Mon, 19 Jan 2009 11:16:06 -0700, "starfire"
starfire151@cableone.net> wrote:
I've know 27R on a resistor is 27 ohms but what is 300R on an inductor?
Is
it 300uH?
Dave
Did you measure the resistance of this 'inductor' ?
peter
an inductor and not a resistor. The value is associated with the lines
going to the power leads of a USB connector (the +%VDC and the Gnd lines).
Dave
S
starfire
Guest
"Tim Shoppa" <shoppa@trailing-edge.com> wrote in message
news:14f497e6-035f-4830-9b8e-4140469b9e7e@w39g2000prb.googlegroups.com...
On Jan 20, 6:32 pm, "starfire" <starfire...@cableone.net> wrote:
but instead specify impedance at 100MHz. 300 Ohms at 100MHz
is entirely typical. Invariably it's a common mode choke.
This specification trend for Z@100MHz seems to be common for ferrite
beads too.
Tim.
Thanks
-- Dave
news:14f497e6-035f-4830-9b8e-4140469b9e7e@w39g2000prb.googlegroups.com...
On Jan 20, 6:32 pm, "starfire" <starfire...@cableone.net> wrote:
Typical USB power chokes may not specify an inductance at all,"Peter Dettmann" <pe...@aardvark.net.au> wrote in message
news:3ilcn4la9cogv8elodsun1l97jucj9hk0l@4ax.com...
On Mon, 19 Jan 2009 11:16:06 -0700, "starfire"
starfire...@cableone.net> wrote:
I've know 27R on a resistor is 27 ohms but what is 300R on aninductor?
Is
it 300uH?
Dave
Did you measure the resistance of this 'inductor' ?
peter
Its on a schematic and I don't have access to the circuit. It is drawn as
aninductorand not a resistor. The value is associated with the lines
going to thepowerleads of aUSBconnector (the +%VDC and the Gnd lines).
but instead specify impedance at 100MHz. 300 Ohms at 100MHz
is entirely typical. Invariably it's a common mode choke.
This specification trend for Z@100MHz seems to be common for ferrite
beads too.
Tim.
Thanks
-- Dave
T
Tim Shoppa
Guest
On Jan 20, 6:32 pm, "starfire" <starfire...@cableone.net> wrote:
but instead specify impedance at 100MHz. 300 Ohms at 100MHz
is entirely typical. Invariably it's a common mode choke.
This specification trend for Z@100MHz seems to be common for ferrite
beads too.
Tim.
Typical USB power chokes may not specify an inductance at all,"Peter Dettmann" <pe...@aardvark.net.au> wrote in message
news:3ilcn4la9cogv8elodsun1l97jucj9hk0l@4ax.com...
On Mon, 19 Jan 2009 11:16:06 -0700, "starfire"
starfire...@cableone.net> wrote:
I've know 27R on a resistor is 27 ohms but what is 300R on aninductor?
Is
it 300uH?
Dave
Did you measure the resistance of this 'inductor' ?
peter
Its on a schematic and I don't have access to the circuit. It is drawn as
aninductorand not a resistor. The value is associated with the lines
going to thepowerleads of aUSBconnector (the +%VDC and the Gnd lines).
but instead specify impedance at 100MHz. 300 Ohms at 100MHz
is entirely typical. Invariably it's a common mode choke.
This specification trend for Z@100MHz seems to be common for ferrite
beads too.
Tim.
K
krw
Guest
In article <BLqdnQSHXuLl7-vUnZ2dnUVZ_qrinZ2d@supernews.com>,
starfire151@cableone.net says...>
design frequency.
starfire151@cableone.net says...>
Ferrite beads look more like resistors than inductors at their"Tim Shoppa" <shoppa@trailing-edge.com> wrote in message
news:14f497e6-035f-4830-9b8e-4140469b9e7e@w39g2000prb.googlegroups.com...
On Jan 20, 6:32 pm, "starfire" <starfire...@cableone.net> wrote:
"Peter Dettmann" <pe...@aardvark.net.au> wrote in message
news:3ilcn4la9cogv8elodsun1l97jucj9hk0l@4ax.com...
On Mon, 19 Jan 2009 11:16:06 -0700, "starfire"
starfire...@cableone.net> wrote:
I've know 27R on a resistor is 27 ohms but what is 300R on aninductor?
Is
it 300uH?
Dave
Did you measure the resistance of this 'inductor' ?
peter
Its on a schematic and I don't have access to the circuit. It is drawn as
aninductorand not a resistor. The value is associated with the lines
going to thepowerleads of aUSBconnector (the +%VDC and the Gnd lines).
Typical USB power chokes may not specify an inductance at all,
but instead specify impedance at 100MHz. 300 Ohms at 100MHz
is entirely typical. Invariably it's a common mode choke.
This specification trend for Z@100MHz seems to be common for ferrite
beads too.
design frequency.
F
Franc Zabkar
Guest
On Mon, 19 Jan 2009 11:16:06 -0700, "starfire"
<starfire151@cableone.net> put finger to keyboard and composed:
http://www.tdk.co.jp/tefe02/e531_ltf5022.pdf
http://www.toko.co.jp/products/cn/pdf/inductors/d518lc.pdf
http://www.cooperet.com/library/products/PM-4311%20SD-Series.pdf
http://www.datasheetarchive.com/pdf-datasheets/Datasheets-pdf-4/67372.pdf
An inductor marked "1R2" has an inductance of 1.2uH at 100kHz.
An inductor marked "220" has an inductance of 22.0uH.
Maybe the dimensions, DC resistance, and application could provide
some confirmation.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
<starfire151@cableone.net> put finger to keyboard and composed:
Here are a few examples:I've know 27R on a resistor is 27 ohms but what is 300R on an inductor? Is
it 300uH?
Dave
http://www.tdk.co.jp/tefe02/e531_ltf5022.pdf
http://www.toko.co.jp/products/cn/pdf/inductors/d518lc.pdf
http://www.cooperet.com/library/products/PM-4311%20SD-Series.pdf
http://www.datasheetarchive.com/pdf-datasheets/Datasheets-pdf-4/67372.pdf
An inductor marked "1R2" has an inductance of 1.2uH at 100kHz.
An inductor marked "220" has an inductance of 22.0uH.
Maybe the dimensions, DC resistance, and application could provide
some confirmation.
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.