[time-nuts] Slightly OT: interest in a four-output, ultra-low jitter, synthesizer block?

Bob kb8tq kb8tq at n1k.org
Thu Jan 25 16:53:04 EST 2018


You can mod toaster ovens, they work ok, EEVB has *lots* of info on that. When you buy
your PCB you can get solder stencils at the same time. Bought as a package they are in the
$10 or so range. Without buying the boards with them, I’m sure the price goes up a bit. The
metal ones are a bit more than plastic ones.

Solder paste should be refrigerated if you want it to last. How long it will do sitting on the bench
is a “that depends” sort of thing. Amazon will send you a  (small) tube for $10 or so. 

The whole “can you do it” depends a bit on how good your microscope is and how steady your
hands are. 

Again, EEVB is your friend if you really want to get into this.


> On Jan 25, 2018, at 4:41 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> jra at febo.com said:
>> The challenge is that the chip is a 7x7 mm 44-QFN package and really  wants
>> to be put on a six-layer circuit board.  That's doable, but  challenging,
>> for home assembly. 
> Can anybody comment on the toaster oven approach?
> Is it practical for things like this?  How much does a solder mask cost?  How 
> much other stuff do I need?  Does the solder paste need to be refrigerated 
> and other quirks like that?
> What are the chances of a newbie getting a 44-QFN right on the first try?
> -- 
> These are my opinions.  I hate spam.
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