250A - 500A "analog" pulser, rev a2.3

W

Winfield Hill

Guest
I've finished a 3rd rev of my RIS-796A "analog"
fast pulsed current source. This beast can be
programmed with all kinds of waveforms, over a
100:1 range of currents, up to 500 amps, and
turned on or off in about 1us. After a rapid
shutoff, an instantaneous junction temp can be
measured with a 10mA current source. If the
test is repeated with varying ON durations, a
plot of Tj vs time can be made.

Before ordering a batch of PCBs, I'm posting
the design info, looking for your comments.

Schematic:
https://www.dropbox.com/s/uj18eqqaq7urles/RIS-796A_2a_a2.3.pdf?dl=1

PCB views:
https://www.dropbox.com/s/sn8cit9nhlkbgox/RIS-796A_2a_3D.PDF?dl=1
https://www.dropbox.com/s/1vcebcceeuegaq8/RIS-796A_2a_assembly.pdf?dl=1

background info, folder of various files:
https://www.dropbox.com/sh/tcmiahzzughadfk/AABtgFDy01cuTDWDRjujP6jva?dl=0


--
Thanks,
- Win
 
Winfield Hill wrote...
I've finished a 3rd rev of my RIS-796A "analog"
fast pulsed current source. This beast can be
programmed with all kinds of waveforms, over a
100:1 range of currents, up to 500 amps, and
turned on or off in about 1us. After a rapid
shutoff, an instantaneous junction temp can be
measured with a 10mA current source. If the
test is repeated with varying ON durations, a
plot of Tj vs time can be made.

Before ordering a batch of PCBs, I'm posting
the design info, looking for your comments.

Schematic:
https://www.dropbox.com/s/uj18eqqaq7urles/RIS-796A_2a_a2.3.pdf?dl=1

PCB views:
https://www.dropbox.com/s/sn8cit9nhlkbgox/RIS-796A_2a_3D.PDF?dl=1
https://www.dropbox.com/s/1vcebcceeuegaq8/RIS-796A_2a_assembly.pdf?dl=1

background info, folder of various files:
https://www.dropbox.com/sh/tcmiahzzughadfk/AABtgFDy01cuTDWDRjujP6jva?dl=0
Click to expand...

I've added an updated writeup on version a2.3
https://www.dropbox.com/s/pvfshfo2fojz64w/RIS-796A_a2.3_writeup.pdf?dl=1


--
Thanks,
- Win
 
On 27 Mar 2020 12:04:22 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

I've finished a 3rd rev of my RIS-796A "analog"
fast pulsed current source. This beast can be
programmed with all kinds of waveforms, over a
100:1 range of currents, up to 500 amps, and
turned on or off in about 1us. After a rapid
shutoff, an instantaneous junction temp can be
measured with a 10mA current source. If the
test is repeated with varying ON durations, a
plot of Tj vs time can be made.

Before ordering a batch of PCBs, I'm posting
the design info, looking for your comments.

Schematic:
https://www.dropbox.com/s/uj18eqqaq7urles/RIS-796A_2a_a2.3.pdf?dl=1

PCB views:
https://www.dropbox.com/s/sn8cit9nhlkbgox/RIS-796A_2a_3D.PDF?dl=1
https://www.dropbox.com/s/1vcebcceeuegaq8/RIS-796A_2a_assembly.pdf?dl=1

background info, folder of various files:
https://www.dropbox.com/sh/tcmiahzzughadfk/AABtgFDy01cuTDWDRjujP6jva?dl=0
Click to expand...

Another way to get a lot of current is to use a transformer.

https://www.dropbox.com/s/s6ji5ifsatqi24p/AM_Transformer.jpg?raw=1

That's rated 190 amps, but it's good for a lot more at low duty cycle.
I think it's from an old AM station, filaments. I paid $15 for it at a
surplus place in San Carlos, back when there were surplus places.



--

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"
 
On 3/27/2020 4:37 PM, jlarkin@highlandsniptechnology.com wrote:
On 27 Mar 2020 12:04:22 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:


I've finished a 3rd rev of my RIS-796A "analog"
fast pulsed current source. This beast can be
programmed with all kinds of waveforms, over a
100:1 range of currents, up to 500 amps, and
turned on or off in about 1us. After a rapid
shutoff, an instantaneous junction temp can be
measured with a 10mA current source. If the
test is repeated with varying ON durations, a
plot of Tj vs time can be made.

Before ordering a batch of PCBs, I'm posting
the design info, looking for your comments.

Schematic:
https://www.dropbox.com/s/uj18eqqaq7urles/RIS-796A_2a_a2.3.pdf?dl=1

PCB views:
https://www.dropbox.com/s/sn8cit9nhlkbgox/RIS-796A_2a_3D.PDF?dl=1
https://www.dropbox.com/s/1vcebcceeuegaq8/RIS-796A_2a_assembly.pdf?dl=1

background info, folder of various files:
https://www.dropbox.com/sh/tcmiahzzughadfk/AABtgFDy01cuTDWDRjujP6jva?dl=0

Another way to get a lot of current is to use a transformer.

https://www.dropbox.com/s/s6ji5ifsatqi24p/AM_Transformer.jpg?raw=1

That's rated 190 amps, but it's good for a lot more at low duty cycle.
I think it's from an old AM station, filaments. I paid $15 for it at a
surplus place in San Carlos, back when there were surplus places.
Click to expand...

You could mount bike handles to each side and probably get a great
upper-body workout huffing that piece up and down.
 
On Fri, 27 Mar 2020 17:45:39 -0400, bitrex <user@example.net> wrote:

On 3/27/2020 4:37 PM, jlarkin@highlandsniptechnology.com wrote:
On 27 Mar 2020 12:04:22 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:


I've finished a 3rd rev of my RIS-796A "analog"
fast pulsed current source. This beast can be
programmed with all kinds of waveforms, over a
100:1 range of currents, up to 500 amps, and
turned on or off in about 1us. After a rapid
shutoff, an instantaneous junction temp can be
measured with a 10mA current source. If the
test is repeated with varying ON durations, a
plot of Tj vs time can be made.

Before ordering a batch of PCBs, I'm posting
the design info, looking for your comments.

Schematic:
https://www.dropbox.com/s/uj18eqqaq7urles/RIS-796A_2a_a2.3.pdf?dl=1

PCB views:
https://www.dropbox.com/s/sn8cit9nhlkbgox/RIS-796A_2a_3D.PDF?dl=1
https://www.dropbox.com/s/1vcebcceeuegaq8/RIS-796A_2a_assembly.pdf?dl=1

background info, folder of various files:
https://www.dropbox.com/sh/tcmiahzzughadfk/AABtgFDy01cuTDWDRjujP6jva?dl=0

Another way to get a lot of current is to use a transformer.

https://www.dropbox.com/s/s6ji5ifsatqi24p/AM_Transformer.jpg?raw=1

That's rated 190 amps, but it's good for a lot more at low duty cycle.
I think it's from an old AM station, filaments. I paid $15 for it at a
surplus place in San Carlos, back when there were surplus places.




You could mount bike handles to each side and probably get a great
upper-body workout huffing that piece up and down.
Click to expand...

I have a young engineer who works out. He does my heavy lifting.

Like my 11802 scope. Damned thing must weigh 70 pounds. Miguel muscles
that one for me.





--

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"
 
On 3/27/2020 6:20 PM, jlarkin@highlandsniptechnology.com wrote:
On Fri, 27 Mar 2020 17:45:39 -0400, bitrex <user@example.net> wrote:

On 3/27/2020 4:37 PM, jlarkin@highlandsniptechnology.com wrote:
On 27 Mar 2020 12:04:22 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:


I've finished a 3rd rev of my RIS-796A "analog"
fast pulsed current source. This beast can be
programmed with all kinds of waveforms, over a
100:1 range of currents, up to 500 amps, and
turned on or off in about 1us. After a rapid
shutoff, an instantaneous junction temp can be
measured with a 10mA current source. If the
test is repeated with varying ON durations, a
plot of Tj vs time can be made.

Before ordering a batch of PCBs, I'm posting
the design info, looking for your comments.

Schematic:
https://www.dropbox.com/s/uj18eqqaq7urles/RIS-796A_2a_a2.3.pdf?dl=1

PCB views:
https://www.dropbox.com/s/sn8cit9nhlkbgox/RIS-796A_2a_3D.PDF?dl=1
https://www.dropbox.com/s/1vcebcceeuegaq8/RIS-796A_2a_assembly.pdf?dl=1

background info, folder of various files:
https://www.dropbox.com/sh/tcmiahzzughadfk/AABtgFDy01cuTDWDRjujP6jva?dl=0

Another way to get a lot of current is to use a transformer.

https://www.dropbox.com/s/s6ji5ifsatqi24p/AM_Transformer.jpg?raw=1

That's rated 190 amps, but it's good for a lot more at low duty cycle.
I think it's from an old AM station, filaments. I paid $15 for it at a
surplus place in San Carlos, back when there were surplus places.




You could mount bike handles to each side and probably get a great
upper-body workout huffing that piece up and down.

I have a young engineer who works out. He does my heavy lifting.

Like my 11802 scope. Damned thing must weigh 70 pounds. Miguel muscles
that one for me.
Click to expand...

Is that still a valuable instrument in 2020? its sampling memory must be
tiny.
 
On Fri, 27 Mar 2020 19:00:26 -0400, bitrex <user@example.net> wrote:

On 3/27/2020 6:20 PM, jlarkin@highlandsniptechnology.com wrote:
On Fri, 27 Mar 2020 17:45:39 -0400, bitrex <user@example.net> wrote:

On 3/27/2020 4:37 PM, jlarkin@highlandsniptechnology.com wrote:
On 27 Mar 2020 12:04:22 -0700, Winfield Hill <winfieldhill@yahoo.com
wrote:


I've finished a 3rd rev of my RIS-796A "analog"
fast pulsed current source. This beast can be
programmed with all kinds of waveforms, over a
100:1 range of currents, up to 500 amps, and
turned on or off in about 1us. After a rapid
shutoff, an instantaneous junction temp can be
measured with a 10mA current source. If the
test is repeated with varying ON durations, a
plot of Tj vs time can be made.

Before ordering a batch of PCBs, I'm posting
the design info, looking for your comments.

Schematic:
https://www.dropbox.com/s/uj18eqqaq7urles/RIS-796A_2a_a2.3.pdf?dl=1

PCB views:
https://www.dropbox.com/s/sn8cit9nhlkbgox/RIS-796A_2a_3D.PDF?dl=1
https://www.dropbox.com/s/1vcebcceeuegaq8/RIS-796A_2a_assembly.pdf?dl=1

background info, folder of various files:
https://www.dropbox.com/sh/tcmiahzzughadfk/AABtgFDy01cuTDWDRjujP6jva?dl=0

Another way to get a lot of current is to use a transformer.

https://www.dropbox.com/s/s6ji5ifsatqi24p/AM_Transformer.jpg?raw=1

That's rated 190 amps, but it's good for a lot more at low duty cycle.
I think it's from an old AM station, filaments. I paid $15 for it at a
surplus place in San Carlos, back when there were surplus places.




You could mount bike handles to each side and probably get a great
upper-body workout huffing that piece up and down.

I have a young engineer who works out. He does my heavy lifting.

Like my 11802 scope. Damned thing must weigh 70 pounds. Miguel muscles
that one for me.



Is that still a valuable instrument in 2020? its sampling memory must be
tiny.
Click to expand...

It's fabulous. The 20 GHz TDR is wonderful, and I have a 50 GHz
sampling head. And a dual-channel probe sampler: 3 GHz, 0.25 pF at the
probe tips.

The memory is whatever's on the screen.





--

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 wrote...
I've added an updated writeup on version a2.3
https://www.dropbox.com/s/pvfshfo2fojz64w/RIS-796A_a2.3_writeup.pdf?dl=1
Click to expand...

OK, I learned that although Word won't accept .eps
files, showing it as blank, you can convert them to
.eml files, and thereby retain vector resolution in
your final .pdf file. Good to know.

So I've replaced the writeup with a new copy having
an embedded readable expandable schematic. Same link.

https://www.dropbox.com/s/pvfshfo2fojz64w/RIS-796A_a2.3_writeup.pdf?dl=1


--
Thanks,
- Win
 
On 28/3/20 1:57 pm, jlarkin@highlandsniptechnology.com wrote:
On Fri, 27 Mar 2020 19:00:26 -0400, bitrex <user@example.net> wrote:

On 3/27/2020 6:20 PM, jlarkin@highlandsniptechnology.com wrote:
I have a young engineer who works out. He does my heavy lifting.
Like my 11802 scope. Damned thing must weigh 70 pounds. Miguel muscles
that one for me.
Is that still a valuable instrument in 2020? its sampling memory must be
tiny.
It's fabulous. The 20 GHz TDR is wonderful, and I have a 50 GHz
sampling head. And a dual-channel probe sampler: 3 GHz, 0.25 pF at the
probe tips.
Click to expand...

I lucked into a cheap Tek 7904 with the 7S12 (S-53 & S-6) TDR plugin.
It's supposed to be about 25/30ps. Not as good as the 11802 at <20ps,
but still, I'm pretty pleased. I'd long been planning to build a TDR,
but this is better than anything I could make.

I have to learn to use it now... any good resources (that I might not
have already found)?

CH
 
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