Hi! I need to find a rheostat for my sons boyscout project... he needs a rheostat that will handle 2w 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.
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.
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 ).
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.
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. snipped-for-privacy@yahoo.com
explain the project in more detail. There is usually more
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