low frequency amplification
in [Design]
|
Prev: How many usenet misfits have Aspergers? MY INITIAL ASSESSMENT
Next: 36v power tool motor to replace scooter motor?
From: Paul Hovnanian P.E. on 6 Aug 2010 17:04 Tim Williams wrote: > > "Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message > news:i3hmi5$hhb$1(a)news.albasani.net... > > If you mathematically look at it, look up Fourrier transform, > > Four rear transform? > > Rule 34, it lives No, its 'furrier' transform. Because the math is pretty hairy. -- Paul Hovnanian mailto:Paul(a)Hovnanian.com ------------------------------------------------------------------ Ask me about my vow of silence.
From: Tim Wescott on 6 Aug 2010 18:34 On 08/06/2010 02:04 PM, Paul Hovnanian P.E. wrote: > Tim Williams wrote: >> >> "Jan Panteltje"<pNaonStpealmtje(a)yahoo.com> wrote in message >> news:i3hmi5$hhb$1(a)news.albasani.net... >>> If you mathematically look at it, look up Fourrier transform, >> >> Four rear transform? >> >> Rule 34, it lives > > No, its 'furrier' transform. Because the math is pretty hairy. > Or 'farrier' transform, because it'll kick you in the head if you aren't careful? -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
From: Jan Panteltje on 6 Aug 2010 18:47 On a sunny day (Fri, 06 Aug 2010 14:04:58 -0700) it happened "Paul Hovnanian P.E." <Paul(a)Hovnanian.com> wrote in <4C5C78FA.B3C40C93(a)Hovnanian.com>: >Tim Williams wrote: >> >> "Jan Panteltje" <pNaonStpealmtje(a)yahoo.com> wrote in message >> news:i3hmi5$hhb$1(a)news.albasani.net... >> > If you mathematically look at it, look up Fourrier transform, >> >> Four rear transform? >> >> Rule 34, it lives > >No, its 'furrier' transform. Because the math is pretty hairy. Fourier is actually simple. I even did it in ASM on a PIC with sine lookup table: http://panteltje.com/panteltje/pic/scope_pic/
From: Rich Grise on 6 Aug 2010 20:12
On Fri, 06 Aug 2010 11:57:55 -0700, panfilero wrote: > > I have a question about where do frequencies end and pulses start? > > I'm trying to make an impact detection circuit, I have some sensors on > a mat, and when something strikes the mat I get a small voltage (like > 100mV).... so I'd like to amplify this 100mV to something around > 1V.... > > I've been reading up online on how to do this, and the app notes and > other sources I've found say that it's important to take the frequency > of my system into account and make sure my amp can handle that > frequency range... > > I don't know what the frequency of my system could be... if I get one > impact a minute... is that even a frequency? or just detecting a > pulse... do I even need to worry about the frequency range if I'm just > detecting random events? maybe I start seeing 1 impact per second... > now I'm at 1Hz.... does this require a special kind of op-amp? > > Does a single voltage spike have a frequency associated with it that I > need to take into consideration when creating my amplifier? > > as you can see I'm pretty confused about this low frequency/impulse > stuff.... any help is greatly appreciated, > thanks! You want to look at the frequency _response_ of your system. The higher the frequency response, the faster it'll be able to respond to the edge of a pulse or a contact like yours. As far as frequency itself, that would be more like how often are people stepping on the pad, which I kinda intuit isn't what you're looking for here. :-) Have Fun! Rich |