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Old 21st October 2012, 05:46 PM   #1301
AR2 is offline AR2  United States
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Guys, I have not seen the position and size of those resistor arrays, but what you might find helpful is if you cannot solder the regular way, what sometimes works is to apply solder paste to the pads (very thin layer) and than heat up with hot air, while you are holding resistor pressed from above. If you do not have SMD workstation, you could use heat gun, if it is the one with temperature adjustment. Obviously SMD station will be better, but if you do not have it, heat gun will do the job. You have to be careful not to apply too much of the paste, so the trick is to apply paste and takeaway with cotton swab. What is left is quite enough.
OK, I just checked picture. What you have to have is really fine braided wick. So even if your solder connects resistor legs, do not worry, you will take it easily with wick. But the key is to have the finest wick, and if you are using solder use the thinnest one you could find.
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Old 21st October 2012, 05:50 PM   #1302
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Old 21st October 2012, 11:27 PM   #1303
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Quote:
Originally Posted by AR2 View Post
Guys, I have not seen the position and size of those resistor arrays, but what you might find helpful is if you cannot solder the regular way, what sometimes works is to apply solder paste to the pads (very thin layer) and than heat up with hot air, while you are holding resistor pressed from above. If you do not have SMD workstation, you could use heat gun, if it is the one with temperature adjustment. Obviously SMD station will be better, but if you do not have it, heat gun will do the job. You have to be careful not to apply too much of the paste, so the trick is to apply paste and takeaway with cotton swab. What is left is quite enough.
Thanks guys, you make a lot of sense on SMT soldering skills.

I'd like to share the way I solder the resistor array, may not the best way, but it works.

1. Heat the pads by hot air to roughly 80C, plate very thin solder to each pad by iron with needle head, I use 0.4mm solder wire.

2. File the pads having thick solder by a small fine file or sand paper and making them flat, clean left metal powder completely by PCB wash cleaner or alcohol.

3. Place flux (clean free prefer) on both the pads and the resistor array.

4. Heat the pads by hot air from SMT solder station till the solder on the pads get melt, meanwhile, pick up the resistor array on the long side with a tweezers, place the resistor array accurately over the footprint with solder melting. Remove hot air but don't move the tweezers to keep the resistor array at the position till the solder curdle. (have to wear glove on the hand holding tweezers, avoid un-stable hand under hot air)

5. Place a bit flux on the pins of the resistor array which is already on the pads, heat it by hot air from the SMT station again and making the solder melt on each pads, the tension of the melt solder from each pad will draw the resistor array into the center balanced position. Use the pin of the tweezers touch a little bit if not exactly at the center, remove hot air

6. Clean PCB again and make sure no any short or disconnect on each pin by a multi-meter.

7. Cross your fingers.

Ian
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Old 22nd October 2012, 01:23 AM   #1304
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Very detailed procedures, Thanks Ian.

But I have un-stable hand even under cool air
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Old 22nd October 2012, 02:27 AM   #1305
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Very detailed procedures, Thanks Ian.

But I have un-stable hand even under cool air
Me too . But try to find some support under your hand, that helps.

Ian
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Old 22nd October 2012, 02:34 AM   #1306
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I haven't tried this for soldering before, but when I was doing a lot of photography a while back I found I could reduce camera shake by keeping both elbows closer to my sides rather than up in the air away from my body ... just a thought.

EDIT: apologies for any embarassement if you're now sitting there waving your elbows like a chicken working this out I'm hoping nobody noticed my sitting at my desk eating lunch and doing exactly that just now!

Last edited by hochopeper; 22nd October 2012 at 02:42 AM.
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Old 22nd October 2012, 02:41 AM   #1307
qusp is offline qusp  Australia
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lol gimp soldering haha
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Old 22nd October 2012, 02:15 PM   #1308
hirez69 is offline hirez69  Europe
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Default Isolation board

Ian,

which is the max input voltage for the Dual XO board (J5 connector)?

Thanks
hirez69
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Old 22nd October 2012, 03:01 PM   #1309
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hirez69:

The max input DC is rated at 5.5V. Could go a bit higher based on real testing, because of output current is much lower then 200ma for each LDO. But not recommend higher than 6.5V

Ian
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Old 23rd October 2012, 12:39 AM   #1310
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Default Battery PCB shipped

All passive battery manage board PCB posted today for evaluation. Hope testing group will get them soon.

bigpandahk: Just sent a new isolator PCB together, four resistor arrays assembled. Hope it works.

ryanj: still not get your shipping address. Please send me an email, or let me know if your don't need the PCB.

Ian
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