Hi everyone, any recommended SMD resistors? I did read about the bulk metal foil ones being the best but the price is just too expensive.
I am thinking either thick film or thin film, whats the difference between the 2??
I am thinking either thick film or thin film, whats the difference between the 2??
Thick film will generally have higher power rating for a given size than thin film. thin film usually has tighter tolerances, but there's no guarantee.
Panasonic thin film and Beyschlag MMA/MMB series are usually the best, the latter are among the lowest noise resistors ever produced. Availability is erratic and thin, depending on your choice of values.
Panasonic thin film and Beyschlag MMA/MMB series are usually the best, the latter are among the lowest noise resistors ever produced. Availability is erratic and thin, depending on your choice of values.
What is the reason for replacement? Most resistors in most circuit locations are contributing less noise than other components.😉
Regards
Regards
Oh, its because its a 2nd hand amp. The previous owner used a through hole resistor instead of SMD one to replace it. So I just want to use back the SMD one.
Thin film is of cause better for feedback circuits than thick film.
But it possibly can be that previous user put good metal film through hole resistors too (so there is no need to change them). Who knows.
But it possibly can be that previous user put good metal film through hole resistors too (so there is no need to change them). Who knows.
Go with a thin film type if you want low distortion. The Susumu RG and RR series are excellent.
Tom
Tom
Yes, he did use 2 x 5ohm vishay dale wirewound resistors in series to make it 10ohm. The only issue is he didn't replace them for both channels. So, it end up left channel using Dale while right channel still using the SMD one. I just prefer both sides to be using the same. Since original design is SMD so I guess I will jsut buy 2 of them and replace both sides so they are the same.
But I am also thinking maybe I just replace the SMD one with the same wirewound one. Easier to solder.
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So these are Zobel/power supply resistors? You will probably be looking for thick film resistors, Bourns makes some nice 2W versions.
SMD resistors need special tools for removal. You can do it with a piece of wire bent into a U and heat the middle of the U. The ends should get hot enough to remove the resistor.
SMD are easier and safer to solder to SMD pads. TH parts will always have the risk of a pulled pad, due to the much higher soldering/desoldering temperatures required.
SMD resistors need special tools for removal. You can do it with a piece of wire bent into a U and heat the middle of the U. The ends should get hot enough to remove the resistor.
SMD are easier and safer to solder to SMD pads. TH parts will always have the risk of a pulled pad, due to the much higher soldering/desoldering temperatures required.
Yes, they are power supply resistors. I figure that the heat probably killed them in the long run. Oh ok, I will take a look at it on digikey or mouser.
Thanks!!!
If you have doubts about heat and power rating, use twice the value and piggyback the resistors on top of each other. This doubles your power rating. SMD flat-pack resistors are easy to stack this way, I also use this method for active crossovers where you need Cx and 2Cx values in addition to resistors.
+1. I use this trick too. But as we see for TS he needs just powerful resistors, so any type will be ok. And wired resistors usually withstand to power transients much better than SMD so I am inclined to wired throghole ones.
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Except it doesn't, it probably has only a marginal effect on the power rating as for SMT the PCB is the heatsink, and piggybacking doesn't help much, but having large areas of copper pour and lots of thermal vias does.