Re: gEDA-user: Surface mounted circuits in hobby projects

[Steven Michalske <smichalske@xxxxxxxxx>]

On Apr 2, 2009, at 1:36 PM, Peter Carlsson wrote:

> Approximately how much heat does a circuit stand?

All depends on the part,  data sheets contain that information.
e.g. they might say, hand solder 700°F for 9 seconds max
some might specify a rest time.

the key is to be quick about the soldering, use an iron that can  
quickly apply enough heat to get the job done.


an example from my youth.

I was soldering DE9 shells with a 15 Watt radio shack special.
This caused me to deform most of the plastic that the pins were held  
with.
My dad saw the results and told me that i needed a bigger iron.
He got out the 250 Watt soldering gun and soldered each pin with out  
melting the plastic.

It's because the 15 Watt iron took too long to impart enough heat to  
melt the solder, but could deliver enough heat over time to melt the  
plastic.


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