Hello,
I'm looking into making several high wattage resistors for amp work, using the nichrome wire in stove top coiled elements. Due to a move soon and my location, buying them is months away. I have several spare elements.. they ohm out at about 38 ohms.. if I remove the wire from the casing and cut it back to about 7.5/8ohms, coil it and then encase it in a paster of paris/sand mixture. Would that be fine?
Thank you in advance
I'm looking into making several high wattage resistors for amp work, using the nichrome wire in stove top coiled elements. Due to a move soon and my location, buying them is months away. I have several spare elements.. they ohm out at about 38 ohms.. if I remove the wire from the casing and cut it back to about 7.5/8ohms, coil it and then encase it in a paster of paris/sand mixture. Would that be fine?
Thank you in advance
It would probably crumble with heat using plaster of Paris. The chance of getting all of the air bubbles out of your plaster is slim, and will crack.
I have heard of using sections of dryer elements, which I assume are largely the same.
I have heard of using sections of dryer elements, which I assume are largely the same.
I use dryer elements mounted in the lid of a 1 gallon metal paint can filled with mineral oil, along with a vent tube and overflow bottle for expansion overflow. Works great - have used it testing 250wpc amps.
The plaster of paris/sand mixture was the first mix I saw on youtube but now I see I could use high temp cement (silicate) used for fireplaces/stoves under vacuum to remove the bubbles? Has a better heat transfer.
Depends all on Temp
And if Temp changes then also resistance changes. It's not what is called accurate.
you can buy them under a 100USD and then you would be able and test Amps with Power output of up to 1000Watts.
I would definitely save the time to do something else and order them online. and if you are going to order them take two 4 ohms, so you can use them for 3 different Resistances, 2, 4 and 8 ohm..
however, it's your decision if you build it or BUY.
And if Temp changes then also resistance changes. It's not what is called accurate.
you can buy them under a 100USD and then you would be able and test Amps with Power output of up to 1000Watts.
I would definitely save the time to do something else and order them online. and if you are going to order them take two 4 ohms, so you can use them for 3 different Resistances, 2, 4 and 8 ohm..
however, it's your decision if you build it or BUY.