Re: TI-H: TI-86 Slowdown?
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Re: TI-H: TI-86 Slowdown?
---David Knaack <dknaack@geocities.com> wrote:
>
> Ok, apparently no one on the list is both proficent in analog
electronics
> and willing to help out with this problem, so here is what my next
attempt
> will be.
>
> What I'm guessing I need is a low-pass filter that will cut the
noise I
> am detecting (50mV total amplitude, 10kHz). Since I haven't found
> anyone who could tell me how to design a decent filter, I am drawing
> on another hobby, audio systems.
> Now, does anyone have any comments or suggestions on how
> I might be able to acomplish this better, or do none of
> you have any experiance with analog electronics?
>
> Thanks,
> DK
Uhm, sorry, i was busy on another project. Anyway if you have problems
finding small inductors, you could always use another filter using a
resistor and a capacitor (since both can be found small.) these
filters aren't as good as filters using capacitors and inductors, but
for applications like yours it's good enough.
It looks like this:
------
O--| R1 |----------O
------ |
---
--- C1
|
O--------------------O
Switch R1 and C1 for a highpass filter. I believe the formula was:
1
f=----------
2*pi*R1*C1
I'm not totally sure, because i haven't used this for a while, but i
will check it and let you know. BTW, are you sure you're calc doesn't
work because of that little rimple?(I can't believe 50mV can crash a
calc.) Anyway, i hope you can use this.
Sayonara,
Neil
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