JFET's ready for abuse

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Magura

Magura

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Joined 2003
class-a-labs.com
So, how do we get around keeping these little critters cool?

A respectable copper base seems to do the trick.

A little DIY reflow soldering and some machining later, I got this:


Magura :)
 

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Zen Mod

Zen Mod

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Magura said:


If there is enough interest, I will consider the possibility to make a larger run of them.

So far I have just made 18, and from those, I have a need for 8 of right now, so that doesn't leave many for the greedy boys :xeye:


Magura :)
Click to expand...


well - you always know where you can send two pairs of these nasty blocks ;)

(just joking , I'll made my own )

describe your way of soldering little critters to blocks , without escape of precious white smoke ?
 
flg

flg

Member
Joined 2005
I haven't tried any soldering on these JFETs yet but on a daily basis I do such things with similar devices to heavy copper PCBs. Low Temp solder paste is the way to go. For something like the I-Pak I would typically use an air pre-heat stage wich is entended to heat the PCB area up, from the under side, to about 125C over 2-3 minutes. At that point I would put the air pencil to the device and surrounding area from the top side. The paste I use has a Liquidous state at about 140C(Sn42/Bi58). The pencil is ussually set to about 380C but there are alot of variables involved like distance from the device, flow rate, etc. You can watch the paste flow and get molten after about 10-20 seconds. Generally you need a tap on the top center of the device to push down and squash out excess solder and voids and you're done!
Chances are the device would not see over 175C
:smash: :smash: :smash:
 
Magura

Magura

Member
Joined 2003
class-a-labs.com
flg said:
I haven't tried any soldering on these JFETs yet but on a daily basis I do such things with similar devices to heavy copper PCBs. Low Temp solder paste is the way to go. For something like the I-Pak I would typically use an air pre-heat stage wich is entended to heat the PCB area up, from the under side, to about 125C over 2-3 minutes. At that point I would put the air pencil to the device and surrounding area from the top side. The paste I use has a Liquidous state at about 140C(Sn42/Bi58). The pencil is ussually set to about 380C but there are alot of variables involved like distance from the device, flow rate, etc. You can watch the paste flow and get molten after about 10-20 seconds. Generally you need a tap on the top center of the device to push down and squash out excess solder and voids and you're done!
Chances are the device would not see over 175C
:smash: :smash: :smash:
Click to expand...


Exactly, this is done on daily basis, nothing new, risky or fancy. This is a well tested, everyday manufacturing principle.

The only news to this, is that it's been done successfully, with relatively low-tech machinery.

.....and naturally the fun of being able to push the limits for the Lovoltech's a bit ;)


Magura :)
 
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