Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Users Search
Help Dashboard Sign In Sign Up
Q&A Papers Meta
Q&A
Posts Tags Edits
Ask Question

Comments on High pass filter design

Post

High pass filter design

+1
−0

Despite there are many filter calculators available on the web, I still have difficulties to translate what I need into calculator design parameters.

For my application, I need ideally a high pass filter that kill everything below 60Hz, and keep everything near 100Hz. More mathematically, I would like a HP filter that keep 99% of the signal (voltage) at 90 Hz, and kill x % of the signal at 60Hz (say x = 98%, but I can compromise to reduce the complexity of the filter).

Other considerations are:

  1. I don't care of phase distortion
  2. active filter is OK
  3. max amplitude of the signal +/- 8V
  4. very weak current (it is to be the input of an oamp).

How the real pros would translate these needs into design rules for a calculator?

filter
posted about 4 years ago
4y ago
user card
coquelicot‭
704 reputation 17 33 90 142
History
Why does this post require attention from curators or moderators?
You might want to add some details to your flag.
Why should this post be closed?

1 comment thread

General comments (3 comments)
General comments
Lundin‭ wrote about 4 years ago
copy link

Wouldn't you rather want a band pass filter at 100Hz +/- something? Could you give more details about the signals and application? What about currents?

coquelicot‭ wrote about 4 years ago · edited about 4 years ago
copy link

Regarding currents, see my edit, no (4). Regarding the bandpass filter, I think it is always more complex than a high pass filter, so I've not precised that. But if that can help, I don't need more than 110 Hz (that is, the band would be 90Hz-110Hz).

Olin Lathrop‭ wrote about 4 years ago · edited about 4 years ago
copy link

You really need to step back and look at the whole problem, not the details of one imagined solution to the higher level problem. You are apparently trying to measure electric fields. Ask about that directly in a separate question. In particular, explain what fields you are trying to measure, their cause, their magnitude range, how fast you want to detect changes, and the like. Explain what you've tried, but don't get hung up on it since that's likely what needs to be rethought.