[sdiy] Transition to Lead-Free Hand Soldering

Jay Schwichtenberg jschwich53 at comcast.net
Fri Aug 20 22:53:38 CEST 2021

Thanks Tom.

Yes I did get it backwards.

Good idea to finish your morning coffee before typing.

Jay S.

On 8/20/2021 1:24 PM, Tom Bugs via Synth-diy wrote:
> As far as I'm aware it is the other way around to what Jay says --- 
> lead-free solder should not be used on leaded boards, but leaded 
> solder is fine on either.
> As others have noted, do not use lead-free solder for repairs on old 
> leaded equipment.
> On 20/08/2021 21:12, Vladimir Pantelic via Synth-diy wrote:
>> On 8/20/21 10:07 PM, Jay Schwichtenberg via Synth-diy wrote:
>>> One thing I haven't seen mentioned here is the PCBs. There are 
>>> various coatings used for the solder pads, this only applies for the 
>>> solder tinned ones. So, my understanding (correct me if I'm wrong 
>>> here) here is that you can solder lead tinned boards with lead free 
>>> solder but you can't solder lead free tinned boards with leaded 
>>> solder. So you'll have to know what your boards are tinned with and 
>> all my "prototype" PCBs are lead free HASL and they solder just fine 
>> with leaded solder - no idea if they will spontaneously explode in a 
>> couple of years though...
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