Thanks guys, I give each idea some thought.

Rich

On Sun, Dec 5, 2010 at 2:26 PM, Geoffrey  wrote:

> Id say generate a square wave to the input.
>
> If you get a square wave out its pretty good response
> you need like 100 third order (ODD) harmonica to get a good square wave.
> If the top of the wave slopes one way you need better high response.
> if it slopes the other you need better low response.
>
> It is how you calibrate a scope probe for the best response.
>
> It should test any wide BW responses you want to.
>
> Download and install the program called Audacity and you can play with
> WAVE files of your own making.
>
> Build an amplitude demodulator out of a diode and a capacitor
> and build your own low freq demodulator.
> Play the sound through a portable MP3 player into the demodulator
> into your amplifier ???
>
> I set my 1000Hz tone decoder this way for WWV.
> But for WWV 1000 HZ you need no demodulator.
> The player handles 1000Hz just fine.
>
>
>
> Just an idea.
>
>
>
> -----Original Message----- From: Richard Schneider
> Sent: Sunday, December 05, 2010 8:06 PM
>
> To: PSNLIST@..............
> Subject: Testing Amplifier Frequency Response
>
>
>
>  Hello PSN,
>
>
>
> I would like to run a frequency response test of my amplifier/filter but =
I
> only have test equipment in the 50 Hz to 50 KHz range.
>
>
>
> Do any of you have a recommendation for constructing a generator that wou=
ld
> output DC to 5 Hz with a uniform (flat response) voltage?
>
>
>
> There was a CD disc someone was selling (RefCD) at the URL below that
> modulates a 1 KHz sine wave with a 1 Hz since wave. I believe the idea is=
 to
> filter out the 1 KHz signal at the output of a PC sound card. What are le=
ft
> are pure VLF signals that could be used to sweep the amplifier/filter.
>
>
>
>
> http://www.science-project.com/_members/science-projects/sponsorads/refcd=
/seis.html
>
>
>
> I know there are several freeware tone generators you can download, but I
> don=92t think a PC sound card can reproduce DC to 1 Hz. Am I correct?
>
>
>
> Thank you,
>
>
>
> Rich
>
>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSNLIST)
>
> To leave this list email PSNLIST-REQUEST@.............. with the body of
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
Thanks guys, I give each idea some thought.
=A0
Rich


On Sun, Dec 5, 2010 at 2:26 PM, Geoffrey <gmvoeth@...........> wrote:

Id say generate a square wave to=
 the input.

If you get a square wave out its pretty good response
you need like 100 third order (ODD) harmonica to get a good square wave.If the top of the wave slopes one way you need better high response.
if=
 it slopes the other you need better low response.

It is how you cal=
ibrate a scope probe for the best response.


It should test any wide BW responses you want to.

Download and i=
nstall the program called Audacity and you can play with
WAVE files of y=
our own making.

Build an amplitude demodulator out of a diode and a =
capacitor

and build your own low freq demodulator.
Play the sound through a portab=
le MP3 player into the demodulator
into your amplifier ???

I set =
my 1000Hz tone decoder this way for WWV.
But for WWV 1000 HZ you need no=
 demodulator.

The player handles 1000Hz just fine.



Just an idea.


-----Original Message----- From: Richard Schneider
Sent: Sunday, D=
ecember 05, 2010 8:06 PM=20

To: PSNLIST@..............
Subject: Testing Amplifier Freque=
ncy Response






Hello PSN,



I would like to run a frequency=
 response test of my amplifier/filter but I only have test equipment in the=
 50 Hz to 50 KHz range.



Do any of you have a recommendation =
for constructing a generator that would output DC to 5 Hz with a uniform (f=
lat response) voltage?




There was a CD disc someone was selling (RefCD) at the URL belo=
w that modulates a 1 KHz sine wave with a 1 Hz since wave. I believe the id=
ea is to filter out the 1 KHz signal at the output of a PC sound card. What=
 are left are pure VLF signals that could be used to sweep the amplifier/fi=
lter.




http://www.science-proje=
ct.com/_members/science-projects/sponsorads/refcd/seis.html




I know there are several freeware tone generators you can download, but=
 I don=92t think a PC sound card can reproduce DC to 1 Hz. Am I correct?


Thank you,



Rich



____=
______________________________________________________


Public Seismic Network Mailing List (PSNLIST)

To leave this list=
 email =
PSNLIST-REQUEST@.............. with the body of the message (first line=
 only): unsubscribe

See h=
ttp://www.seismicnet.com/maillist.html for more information.