I'm building a dummy load device for amp testing. I ordered 4 100W 8 ohm, wire-wound resistors from a vendor in Hong Kong (the gold aluminum jobs). They just arrived and are much smaller I expected; 59 mm long. I Googled a bit and see that other 8RJ resistors are the same size - so, it's my fault. Should I get something heavier? With shipping, they were only $15, so I'm not in too deep.
If these are ones in aluminium casing they must be placed on a heatsink to be able to dissipate 100W. could be smaller one with the fan. Also for the long time I was using 4 8Ohm 10W wire-wound resistors in a beer stain (1l) full of water 🙂 only limitation of this solution that it is not usable for DC loads
Yes, they can dissipate 100W when properly heatsunk.
It will be very hard to find anything that can dissipate 100W in free air!
Jan
It will be very hard to find anything that can dissipate 100W in free air!
Jan
https://www.mouser.com/datasheet/2/303/res_270-1149900.pdf
Up to 1,000 Watt rated resistors. I use the 225 watt versions. Not small and not cheap. They do get hot!
Up to 1,000 Watt rated resistors. I use the 225 watt versions. Not small and not cheap. They do get hot!
I've used something like this before:
8 Ohm 100W Non-Inductive Dummy Load Resistor
They also come in larger sizes/wattage ratings.
I only use low power amps (say 25Wpc) and these loads work fine. Now, I can't
say if they'll burst into flame or not when at closer to 100W. 🙂
8 Ohm 100W Non-Inductive Dummy Load Resistor
They also come in larger sizes/wattage ratings.
I only use low power amps (say 25Wpc) and these loads work fine. Now, I can't
say if they'll burst into flame or not when at closer to 100W. 🙂
These are the corresponding mounting brackets.
Resistor Mounting Hardware - Rheostats Mounting | Ohmite Mfg Co
Last edited: