macrospect
[H]ard|Gawd
- Joined
- Nov 22, 2004
- Messages
- 1,711
I have an older test power supply that I have probably abused 1 too many times, which has a pretty cooked resistor inside (still works but it looks bad). Instead of tossing it, I was hoping to replace the failing resistor. All of the other components appear to be visually ok (ie. not burnt).
Unfortunately, the resistor must have gotten so hot that its insulation began burning off, so I can no longer see any color bands on it and its ceramic coating is flaking off. If I check with my multi meter, it reads right around 7.7 ohms, so that could be either 7.5 or 8 ohms given the +/- 5% tolerance.
So, I am wondering what value I should replace it with? I am not sure how important .5 ohms is but I was trying not to let [the rest] of the smoke out.
Also trying to figure the wattage. Its about 25mm long by about 7mm round. My guess is its at least 5 watt but is there any rule of thumb for these things??
Unfortunately, the resistor must have gotten so hot that its insulation began burning off, so I can no longer see any color bands on it and its ceramic coating is flaking off. If I check with my multi meter, it reads right around 7.7 ohms, so that could be either 7.5 or 8 ohms given the +/- 5% tolerance.
So, I am wondering what value I should replace it with? I am not sure how important .5 ohms is but I was trying not to let [the rest] of the smoke out.
Also trying to figure the wattage. Its about 25mm long by about 7mm round. My guess is its at least 5 watt but is there any rule of thumb for these things??