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Old 25th November 2012, 07:06 PM   #2201
bcarso is offline bcarso  United States
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Originally Posted by Kindhornman View Post
Scott,
You just brought up a subject that you can obviously answer for me. When building a board and using rosin core solder should the hobbyist clean the boards after assembly? I have never done this and can say that I am not an EE so perhaps I have just been lucky or stupid and have never seen a failure because of flux. If I should indeed clean the boards what is the correct solvent to use? 1,1,1,T is long since not allowed and I wonder what is the best solvent for this purpose. Sorry for going off topic here, but I have often wondered if this is only a problem with the never non-lead based solders or all solders with a flux core. Built a Heathkit clock when I was a kid and it worked for almost 40 years before the digital display started to burn out. What is the failure mode action here with the flux?
In the very old days Freon used to be used. Brad Plunkett mentioned once that at UREI all one had to do to get rid of a grease stain on one's tie from lunch was to walk by the cleaning tank

Rosin flux is fairly nonreactive, and unless the board needs to be exceptionally low-leakage it is cleaned off primarily for cosmetic reasons (and as well it can conceal a poor metallurgical joint from visual inspection).
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Old 25th November 2012, 08:10 PM   #2202
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Default It's coming --->

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Originally Posted by scott wurcer View Post
Breadboard is finished, I need to give it a run in our flux cleaning tank and hope to do some measurements this week.
It won't be long now..... drum roll.
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Old 25th November 2012, 08:16 PM   #2203
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Quote:
Originally Posted by bcarso View Post
Rosin flux is fairly nonreactive, and unless the board needs to be exceptionally low-leakage it is cleaned off primarily for cosmetic reasons (and as well it can conceal a poor metallurgical joint from visual inspection).
Not only. If you manufacture for usage in tropics you have to remember that some molds eat rosin and poop acid. How do I know? I was taught to design and manufacture military equipment for very different conditions.
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Old 25th November 2012, 08:22 PM   #2204
bcarso is offline bcarso  United States
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Originally Posted by Wavebourn View Post
Not only. If you manufacture for usage in tropics you have to remember that some molds eat rosin and poop acid. How do I know? I was taught to design and manufacture military equipment for very different conditions.
I'll use the same excuse I do when I inadvertently use offensive language (I thought Bruce Hofer was going to faint when I said "bull$hit" once, referring to someone's claims about typical noise of switchmode power supplies):

Sorry, I'm from California.
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Old 25th November 2012, 08:26 PM   #2205
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Originally Posted by bcarso View Post
I'll use the same excuse I do when I inadvertently use offensive language (I thought Bruce Hofer was going to faint when I said "bull$hit" once, referring to someone's claims about typical noise of switchmode power supplies):

Sorry, I'm from California.
Really! You should have heard Jim Williams and Bob Pease (well they were too).
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Old 25th November 2012, 08:28 PM   #2206
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You need disclaimer, Brad: "Not designed for Florida"
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Old 25th November 2012, 08:47 PM   #2207
bcarso is offline bcarso  United States
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You need disclaimer, Brad: "Not designed for Florida"
I could have that printed on my forehead too. I found Orlando barely tolerable in December. I can only imagine the summer.
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Old 25th November 2012, 09:28 PM   #2208
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Freon is the best, pure isopropyl alcohol and a brush can do. Serious designs remove the rosin.
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Old 25th November 2012, 09:37 PM   #2209
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Originally Posted by scott wurcer View Post
Breadboard is finished, I need to give it a run in our flux cleaning tank and hope to do some measurements this week. Everyone else's efforts look good, though I would like to see at least one FET JE990 get built.
Can you post a picture of the breadboard ?
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Old 26th November 2012, 12:30 AM   #2210
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Can you post a picture of the breadboard ?
UGLY! Let me make some measurements first so maybe I can show ugly is beautiful.
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