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JohnG  
#1 Posted : Monday, December 19, 2016 6:06:52 PM(UTC)
JohnG

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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
Russ White  
#2 Posted : Tuesday, December 20, 2016 3:01:56 PM(UTC)
Russ White

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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
JohnG  
#3 Posted : Tuesday, December 20, 2016 6:15:31 PM(UTC)
JohnG

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Thanks.
JohnG  
#4 Posted : Saturday, January 14, 2017 8:44:41 PM(UTC)
JohnG

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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
Brian Donegan  
#5 Posted : Thursday, January 19, 2017 4:39:05 PM(UTC)
Brian Donegan

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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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