Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
From: "Carolan, Barry" <Barry.Carolan@dpcdsb.org>
To: arlynd@hutch.k12.mn.us; Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>; Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
Sent: Wednesday, April 2, 2008 6:11:11 AM
Subject: Re: [Phys-l] amplifier
I'd keep an eye out at yard/garage sales in springtime. It's amazing how many
people will sell decent amplifiers (10 or 15 years old but still working great)
for $1- $5, especially when so many people want to replace their old amps with
"surround sound" amps. You will need to buy a mini-plug to RCA cable at
radioshack or a dollar store to connect your ipod. The back of a decent amp
will have plugs that you can quickly switch the speakers out of phase with each
other.
________________________________
From: phys-l-bounces@carnot.physics.buffalo.edu on behalf of Arlyn DeBruyckere
Sent: Wed 4/2/2008 8:33 AM
To: Forum for Physics Educators
Subject: Re: [Phys-l] amplifier
Amplified speakers for computers are rather inexpensive (I got some for
about $20). Cut the cord on the "last speaker" (the one without the
controls etc) and reconnect the wires backward. If you still want to
normally use these speakers I suppose you could put on some RCA male and
female connectors or other similar connectors and switch them as
required. Otherwise just keep the modified set for your experiments.
Anthony Lapinski wrote:
I'm teaching about sound and want to reverse speaker wires (red/black) to
show constructive/destructive interference of sound waves (music) with two
speakers/microphones and an oscilloscope. In the past I used cassette
tapes, an old boom box (volume turned up), and old speakers. I would
reverse the (red/black) wire connection (via alligator clips) for one
speaker while the music played. A bit cumbersome, but it worked.
I now have some songs on the computer (iTunes) and wish to repeat the
demo. However, the old stereo speakers (connected via the earphone jack on
the computer) are not loud enough. The new computer speakers are very
loud, because of the amplifier built in, but I don't want to strip the
wires on them.
So I need an "inexpensive" amplifier to boost the loudness from the
computer (1/8 "earphone jack) to my old speakers. Does anyone know where I
could purchase such an item? I assume Radio Shack might have some stuff.
Any better ways to do this demo?
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
--
Arlyn DeBruyckere
Science Teacher
School Photographer
Hutchinson High School
1200 Roberts Road SW
Hutchinson MN 55350
HHS Weather at http://www.hutch.k12.mn.us/weather
http://www.hutchk12.org
mailto:arlynd@hutch.k12.mn.us
http://www.angelfire.com/mn3/hea/
http://www.educationminnesota.org
If it is to be it is up to me!
Hutchinson Sports Photos on the Web
http://hutchinsontigers.pso.com/
http://www.nelson-photography.com/hutchsports
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l
_______________________________________________
Forum for Physics Educators
Phys-l@carnot.physics.buffalo.edu
https://carnot.physics.buffalo.edu/mailman/listinfo/phys-l