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R-L-C structures on PCB

K

Ken Smith

Jan 1, 1970
0
It sounds totally impractical to me, at any rate, to try to make R
from copper cladding.
Anyway, I don't think the OP has thus far actually even told us the
frequency of interest!

What people "want" and what is "practical" are two very different things.

People do sense resistors in power supplies as PCB traces so resistors
have in fact been done that way. It is a question of making something
practical at the OPs frequency.

The Q of a strip line system is limited by the lossiness. It may be
enough for the OPs needs.
 
K

Ken Smith

Jan 1, 1970
0
Hello Ken,

I am interested if there are other applications.
On what application do you think except current sensing?

Current sensing is the one where I know of good results from making
resistances on purpose.

There have been a few cases where I wished I could make resistors inside
the PCB. The one that comes to mind was the need to block 1.2..GHz with a
filter. I didn't do it though. I ended up with a "U" shaped RLC circuit.
The resistance of the inductor was enough for my purposes.
 
T

Terry Given

Jan 1, 1970
0
Ken said:
Helmut Sennewald said:
[....]

I am sure that nobody wants to make R with the PCB-Traces.

I'm sure that isn't true.

Hello Ken,

I am interested if there are other applications.
On what application do you think except current sensing?


Current sensing is the one where I know of good results from making
resistances on purpose.

There have been a few cases where I wished I could make resistors inside
the PCB. The one that comes to mind was the need to block 1.2..GHz with a
filter. I didn't do it though. I ended up with a "U" shaped RLC circuit.
The resistance of the inductor was enough for my purposes.

the evil TVC-1 chassis used a Cu trace for the filament resistor. what a
POS. I shorted them on dozens of TVC-1s used as colour monitors in
videogames, to crank up the filament voltage and get a bit more use out
of soft tubes. most ran happily for several years afterwards.

I also read a paper a few years back on one-shot "guns" that discharged
a bloody great cap into a little bit of PCB trace, and captured the
resultant "bang" to fire a projectile :) The really cool part was how
they used a 1N4007 as a one-time switch for (IIRC) 4kV

Cheers
Terry
 
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