Getting near the end (hopefully!) of fixing a subwoofer amplifier for my son.
While doing a final inspection prior to re-assembly, I noticed that two large power resistors (similar to Vishay Dale CPCP07 type)were loose and had broken leads on them (not salvageable). I just ordered some replacements from Mouser (boy it hurts to have to pay $8 shipping for $2 worth of parts but I wasn't able to shop for other items that I could use due to a shipping deadline).
My question is -
What sort of caulk or epoxy would be recommended to secure these large items to the pcb? The other "large" components were secured with a hard, yellowish material, but the two resistors had only a minimal amount of this material applied and had broken free.
Thanks
While doing a final inspection prior to re-assembly, I noticed that two large power resistors (similar to Vishay Dale CPCP07 type)were loose and had broken leads on them (not salvageable). I just ordered some replacements from Mouser (boy it hurts to have to pay $8 shipping for $2 worth of parts but I wasn't able to shop for other items that I could use due to a shipping deadline).
My question is -
What sort of caulk or epoxy would be recommended to secure these large items to the pcb? The other "large" components were secured with a hard, yellowish material, but the two resistors had only a minimal amount of this material applied and had broken free.
Thanks
Silicone RTV gets my vote. We used them to support large power resistors and capacitors to the PCB's used in AC/DC drive equipment. Excellent vibration resistance.
zigzagflux -
I also worked at a company that used a special "electronic" GE Silicone RTV for this purpose. The regular stuff you get at the hardware store is not suitable (eats the copper I think).
Since I really don't want to order this special RTV because of time and cost (shipping charges) can you think of anything else?
Geek -
What the heck is "shoe glue"? Can it handle the heat? It will be used to secure a 7 Watt resistor.
Thanks,
I also worked at a company that used a special "electronic" GE Silicone RTV for this purpose. The regular stuff you get at the hardware store is not suitable (eats the copper I think).
Since I really don't want to order this special RTV because of time and cost (shipping charges) can you think of anything else?
Geek -
What the heck is "shoe glue"? Can it handle the heat? It will be used to secure a 7 Watt resistor.
Thanks,
Everlast said:
A trick I stmbled across while fixing guitar amps.
Shoe glue is just that - the stuff a cobbler uses to glue the rubber onto the leather part of the shoe. Try a little shoe repair shop.
Can it handle 7 watts? I dunno, but I've seen it handle 2 or 3 watts without losing integrity.
Cheers!
Geek said:
One brand name that is popular in the hobby community is "Shoo Goo"
Here's a random link from Google:
http://www.weplaysports.com/Shoe/Goo/
Any local hobby shop (RC,models,crafts,whatever) should have some.
Well I got back some information from the manufacturer of Shoo Goo and I don't think I will use it -
"SHOO GOO HAS ABOUT 0.1% OF ACETIC ACID."
According to the nice gentleman that I talked to, the acetic acid should evaporate after the product is cured, so that doesn't appear to be a big deal.
"CURED SHOO GOO CAN BE EXPOSED FOR SHORT PERIODS TO TEMPERATURES UP TO 150 F. THE CUSTOMERS NEED TO RUN TESTS TO VERIFY SUITABILITY IN THEIR APPLICATIONS."
This 150 F limitation bothers me though. Since my application is to secure a 7 watt resistor, this product just doesn't seem suitable.
I did a little surfing though and it looks like a GE Silicone II product (NOT 1, which contains acetic acid) might work.
Thanks,
"SHOO GOO HAS ABOUT 0.1% OF ACETIC ACID."
According to the nice gentleman that I talked to, the acetic acid should evaporate after the product is cured, so that doesn't appear to be a big deal.
"CURED SHOO GOO CAN BE EXPOSED FOR SHORT PERIODS TO TEMPERATURES UP TO 150 F. THE CUSTOMERS NEED TO RUN TESTS TO VERIFY SUITABILITY IN THEIR APPLICATIONS."
This 150 F limitation bothers me though. Since my application is to secure a 7 watt resistor, this product just doesn't seem suitable.
I did a little surfing though and it looks like a GE Silicone II product (NOT 1, which contains acetic acid) might work.
Thanks,
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