kinda tough one

It took a week of spare time, 10 ECOs, to go from

https://www.dropbox.com/s/ns2fvffx49jd92a/J271_A1.jpg?raw=1

to

https://www.dropbox.com/s/vx51awoqyb10wtx/J271_A10.jpg?raw=1

Nasty: parts on both sides with complicated clearance issues,
picosecond stuff, crosstalk, serious thermals, panel arrangement
issues, all sorts of things.

It was part tedious and part a lot of fun. I enjoy PCB layout for some
reason, sort of a game like chess with more pieces.

There's a sort of DPAK thick-film 50 ohm resistor, bottom side lower
right, that gets heat sinked to the box through giant copper pours.

https://www.dropbox.com/s/uexrtuav3gyc4ex/PFC_riedon.pdf?dl=0

I may not be able to keep it cool worst-case, so there's a thermistor
R14 to shut things down if it gets too hot.




--

John Larkin Highland Technology, Inc

The cork popped merrily, and Lord Peter rose to his feet.
"Bunter", he said, "I give you a toast. The triumph of Instinct over Reason"

 

[Winfield Hill]

jlarkin@highlandsniptechnology.com wrote...

It took a week of spare time, 10 ECOs, to go from

https://www.dropbox.com/s/ns2fvffx49jd92a/J271_A1.jpg?raw=1

to

https://www.dropbox.com/s/vx51awoqyb10wtx/J271_A10.jpg?raw=1

Nasty: parts on both sides with complicated clearance issues,
picosecond stuff, crosstalk, serious thermals, panel arrangement
issues, all sorts of things.

It was part tedious and part a lot of fun. I enjoy PCB layout for some
reason, sort of a game like chess with more pieces.

There's a sort of DPAK thick-film 50 ohm resistor, bottom side lower
right, that gets heat sinked to the box through giant copper pours.

https://www.dropbox.com/s/uexrtuav3gyc4ex/PFC_riedon.pdf?dl=0

I may not be able to keep it cool worst-case, so there's a thermistor
R14 to shut things down if it gets too hot.

What does J271 do? Does it have a datasheet yet?


--
Thanks,
- Win

 

On 11 Feb 2020 05:20:11 -0800, Winfield Hill <winfieldhill@yahoo.com>
wrote:

jlarkin@highlandsniptechnology.com wrote...


It took a week of spare time, 10 ECOs, to go from

https://www.dropbox.com/s/ns2fvffx49jd92a/J271_A1.jpg?raw=1

to

https://www.dropbox.com/s/vx51awoqyb10wtx/J271_A10.jpg?raw=1

Nasty: parts on both sides with complicated clearance issues,
picosecond stuff, crosstalk, serious thermals, panel arrangement
issues, all sorts of things.

It was part tedious and part a lot of fun. I enjoy PCB layout for some
reason, sort of a game like chess with more pieces.

There's a sort of DPAK thick-film 50 ohm resistor, bottom side lower
right, that gets heat sinked to the box through giant copper pours.

https://www.dropbox.com/s/uexrtuav3gyc4ex/PFC_riedon.pdf?dl=0

I may not be able to keep it cool worst-case, so there's a thermistor
R14 to shut things down if it gets too hot.

What does J271 do? Does it have a datasheet yet?

I call it ADG, analog delay generator, but it could have a better
name. All my code kiddies are busy on c and VHDL and Python, so I'm
designing code-free boxes to stay amused. This is a tiny (3x2x1")
delay-and-width pulse generator. It will have three time ranges, 25ns,
250ns, 2.5 us, with pots to set delay and width in each range. Output
is my little glob-topped GaN driver thing. It will be specified for 1
to 20 volt pulse output, but I think I can spin a version that uses a
48 volt wart and can make 45 volt pulses, and charge more for that
one.

TPG tiny pulse generator

EDGE embedded delay generator

SPUD small pulse delay generator

I should decide and put up a web page.

I might do a pulse amplifier version too. Just strip off most of the
parts from that one. Easy. Maybe make the pulse low level adjustable,
like +-5 instead of ground. The little globbed thing can do that.




--

John Larkin Highland Technology, Inc

The cork popped merrily, and Lord Peter rose to his feet.
"Bunter", he said, "I give you a toast. The triumph of Instinct over Reason"