[hpsdr] Penelope T2 orientation - soldering

[Scott Cowling]

Hi Mike,

While ChipQuik is a good idea, I have removed the transformer with the 
following technique without damage many times:

1. Use fresh, good quality solder-wick to remove as much solder from all 
of the pins as possible. The part can take a fair amount of heat on its 
pins, as long as you don't move them around at the same time.

2. Using a fine dental tool, gently pry each pin up one at a time while 
applying a small amount of heat to the pin. Put the tool under the part 
and pry very gently from the inner end of the pin (next to the part). 
Did I mention to pry *gently*? :-) This is where too much heat or too 
much force will destroy your transformer. If you have removed most of 
the solder, the pin will "pop" free with almost no additional heat. What 
you want to do is heat the top of the pin only, so that it separates 
from the pad without needing to melt the solder on the pad at all. 
Again, this requires very little heat.

3. Work along one side of the transformer. Once three pins (one side) 
are free, the transformer will tilt off the board a bit, allowing easier 
access to the remaining pins on the other side.

I usually set my iron hot, and limit the contact time to prevent 
damaging components. This means you had better not keep the iron on any 
pin for more than a few seconds.

Also be careful not to hit the body of the transformer with the tip of 
the iron; it melts quite easily from direct contact.

73,
Scotty WA2DFI


On 2013-10-06 14:42, AA8K73 GMail wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
> Thank you Hans.
>
> I was thinking of using 250 C, but I guess I need to heat it more.
>
>
> Thank you Joe.
>
> Yes, I am going to use ChipQuik.
>
>
> 73,
> Mike - AA8K
>
>
> On 10/06/2013 05:33 PM, Hans J Smit wrote:
>> **************************
>> I used 380C (briefly) to do this a couple of years ago; no problem.
>> 73, Hans VK5YX
>> **************************
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