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I need to add the output buffers. Do I need a hot air soldering station for that (so that the heatsink solders) or can I just solder the pins with an iron? I dont have a hot air, so Id have to find one to borrow or use a toaster oven
Im converting from a single setup, where I wasn't using the buffers, now to a dual.
Thanks, John
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It is not strictly necessary to use hot air, but it does make the job easier.
You can use a soldering iron, just do the big tab last - it is not necessary to achieve complete wetting under the tab - but at least make sure it is soldered to the pad.
Cheers!
Russ
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Rank: Member
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Rank: Member
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I did solder them on. Now, I have one Legato that seems fine, but the other one is odd.
Connected to a Placid BP HD (which is set and works for the other Legato), this one starts out with only 3v on one side and 5 on the other.
Then, I raise the shunt current (either side - it doesnt seem to matter) and at some point I hear a click and the voltage jumps up to the 14.75 it is set for.
Uplug it, wait a min and plug it back in, and now I have to crank up the shunt current again (above what it was before).
Ive swapped Placids and Legatos and it seems to be this one Legato.
Could I have overheated the buffers? Ive checked the solder joints on them. And looked at the transistors to make sure I didnt swap them.
Thanks, John
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Compare pin-to-pin resistance of the working and non-working buffers. That should tell you if you cooked something (look for shorts).
I assume the non-functioning Legato was functioning correctly before adding the buffers...
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