Rheostat needed

Hi!
I need to find a rheostat for my sons boyscout project... he needs
a rheostat that will handle 25 ohms at 200 watts. If anyone knows
anyone who has one and would like to donate it or sell it at a
reasonable price please contact me.

Bill
ag2217@yahoo.com

 

[Peter Bennett]

On 29 Nov 2006 09:41:46 -0800, ag2217@yahoo.com wrote:

Hi!
I need to find a rheostat for my sons boyscout project... he needs
a rheostat that will handle 25 ohms at 200 watts. If anyone knows
anyone who has one and would like to donate it or sell it at a
reasonable price please contact me.

Bill
ag2217@yahoo.com

Newark Electronics lists two 25 ohm 300 watt rheostats, by Ohmite or
Vishay - they are about C$ 150... (You have a choice of 150 or 300
watts - no 200 watt ).

 

Peter Bennett wrote:

On 29 Nov 2006 09:41:46 -0800, ag2217@yahoo.com wrote:

Hi!
I need to find a rheostat for my sons boyscout project... he needs
a rheostat that will handle 25 ohms at 200 watts. If anyone knows
anyone who has one and would like to donate it or sell it at a
reasonable price please contact me.

Bill
ag2217@yahoo.com

Newark Electronics lists two 25 ohm 300 watt rheostats, by Ohmite or
Vishay - they are about C$ 150... (You have a choice of 150 or 300
watts - no 200 watt ).

$150.00 ? Well I can't afford that...thats for sure...

 

[Boris Mohar]

On 29 Nov 2006 13:23:31 -0800, ag2217@yahoo.com wrote:

Peter Bennett wrote:
On 29 Nov 2006 09:41:46 -0800, ag2217@yahoo.com wrote:

Hi!
I need to find a rheostat for my sons boyscout project... he needs
a rheostat that will handle 25 ohms at 200 watts. If anyone knows
anyone who has one and would like to donate it or sell it at a
reasonable price please contact me.

Bill
ag2217@yahoo.com

Newark Electronics lists two 25 ohm 300 watt rheostats, by Ohmite or
Vishay - they are about C$ 150... (You have a choice of 150 or 300
watts - no 200 watt ).

$150.00 ? Well I can't afford that...thats for sure...

Perhaps you could explain the project in more detail. There is usually more
than one solution.


--

Boris Mohar



--
Posted via a free Usenet account from http://www.teranews.com

 

[Tim Shoppa]

ag2217@yahoo.com wrote:

Peter Bennett wrote:
On 29 Nov 2006 09:41:46 -0800, ag2217@yahoo.com wrote:

Hi!
I need to find a rheostat for my sons boyscout project... he needs
a rheostat that will handle 25 ohms at 200 watts. If anyone knows
anyone who has one and would like to donate it or sell it at a
reasonable price please contact me.

Bill
ag2217@yahoo.com

Newark Electronics lists two 25 ohm 300 watt rheostats, by Ohmite or
Vishay - they are about C$ 150... (You have a choice of 150 or 300
watts - no 200 watt ).

$150.00 ? Well I can't afford that...thats for sure...

There are adjustable power resistors, where changing the resistance
involves a clamp held to the middle of the resistor by a screw. 25
ohms at 225 watts is in the $25 ballpark.

An alternative for this sort of thing might be a bunch of automotive or
home light sockets in parallel, and the "resistance" is set by screwing
in or unscrewing different numbers/types of light bulbs. Bulbs are not
perfect ohmic resistors but you'd be surprised how well this works. And
especially for a boy scout type project the result is visually very
impressive.

Tim.

 

[Eeyore]

ag2217@yahoo.com wrote:

Peter Bennett wrote:
On 29 Nov 2006 09:41:46 -0800, ag2217@yahoo.com wrote:

Hi!
I need to find a rheostat for my sons boyscout project... he needs
a rheostat that will handle 25 ohms at 200 watts. If anyone knows
anyone who has one and would like to donate it or sell it at a
reasonable price please contact me.

Bill
ag2217@yahoo.com

Newark Electronics lists two 25 ohm 300 watt rheostats, by Ohmite or
Vishay - they are about C$ 150... (You have a choice of 150 or 300
watts - no 200 watt ).

$150.00 ? Well I can't afford that...thats for sure...

It's the kind of thing you can sometimes pick up as 'surplus'. Few ppl actually
use them any more.

You should look on ebay.

Graham

 

[Homer J Simpson]

<ag2217@yahoo.com> wrote in message
news:1164835411.674106.320390@n67g2000cwd.googlegroups.com...

$150.00 ? Well I can't afford that...thats for sure...

I've made them out of radiator elements but they are little used these days.

 

Hi Boris,
My son's project is a thing he calls a "Power Soak" He had
the schematics for it donated by a company called Weber Electronics.
They (Weber) call it an attenuator. It is to be placed between a guitar
amplifier and it"s
Speaker or speaker cabinet. It allows the guitarist to run the
amplifier at it's "Sweet Spot" (somwhere near it's top end or at a
place in its volume curve that would be too loud normally) and have it
at a volume that is perfect for whatever atmosphere he happens to be
in. Weber uses two different ways of achieving this one uses very large
power resistors and a rheostat or the Rheostat and what they(Weber)
call a speaker motor... I don't know if this helped at all but I hope
so because I don't have money like $150.00 for one of these
rheostats...I also wonder after some looking if a thing called an
100-200watt L-Pad would work....

Bill G.
ag2217@yahoo.com

On Nov 29, 3:08 pm, Boris Mohar <borism_-voi...@sympatico.ca> wrote:

On 29 Nov 2006 13:23:31 -0800, ag2...@yahoo.com wrote:







Peter Bennett wrote:
On 29 Nov 2006 09:41:46 -0800, ag2...@yahoo.com wrote:

Hi!
I need to find a rheostat for my sons boyscout project... he needs
a rheostat that will handle 25 ohms at 200 watts. If anyone knows
anyone who has one and would like to donate it or sell it at a
reasonable price please contact me.

Bill
ag2...@yahoo.com

Newark Electronics lists two 25 ohm 300 wattrheostats, by Ohmite or
Vishay - they are about C$ 150... (You have a choice of 150 or 300
watts - no 200 watt ).

$150.00 ? Well I can't afford that...thats for sure...Perhaps you could explain the project in more detail. There is usually more
than one solution.

--

Boris Mohar

--
Posted via a free Usenet account fromhttp://www.teranews.com- Hide quoted text -- Show quoted text -

 

[Homer J Simpson]

<ag2217@yahoo.com> wrote in message
news:1166237241.483473.158050@73g2000cwn.googlegroups.com...

It allows the guitarist to run the
amplifier at it's "Sweet Spot" (somwhere near it's top end or at a
place in its volume curve that would be too loud normally) and have it
at a volume that is perfect for whatever atmosphere he happens to be
in.

If you are running the amp at 100 - 200 W continuous you are way past the
'sweet' spot!

Radio Shack : 8-Ohm Non-Inductive Resistor Model: 271-120 $2.29 ea.

Use this as a load and try Model: 271-265 25-Ohm 3-Watt Rheostat $3.99 ea.
to connect to the speakers.

That's $6.30 per channel.

 

[Al]

In article <hk4sm25c9k3jtahtj0tiahmj492cvb0a1m@4ax.com>,
Boris Mohar <borism_-void-_@sympatico.ca> wrote:

On 29 Nov 2006 13:23:31 -0800, ag2217@yahoo.com wrote:


Peter Bennett wrote:
On 29 Nov 2006 09:41:46 -0800, ag2217@yahoo.com wrote:

Hi!
I need to find a rheostat for my sons boyscout project... he needs
a rheostat that will handle 25 ohms at 200 watts. If anyone knows
anyone who has one and would like to donate it or sell it at a
reasonable price please contact me.

Bill
ag2217@yahoo.com

Newark Electronics lists two 25 ohm 300 watt rheostats, by Ohmite or
Vishay - they are about C$ 150... (You have a choice of 150 or 300
watts - no 200 watt ).

$150.00 ? Well I can't afford that...thats for sure...

Perhaps you could explain the project in more detail. There is usually more
than one solution.


--

Boris Mohar

If your project involves 60Hz AC, a variac would be much better. They
can be inexpensive surplus, $10 US or so for an unmounted one.

Al