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FreeCAD, pcb-rnd, sch-rnd
Freecad is getting much better than 10 yrs ago. Stretchable parametric models work well until you get nested levels about 4 deep, then it could hit a snag. Freecad devs compile it for windows 7 and la
Freecad is getting much better than 10 yrs ago. Stretchable parametric models work well until you get nested levels about 4 deep, then it could hit a snag. Freecad devs compile it for windows 7 and la
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By
John Griessen
· #197314
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Restoring damaged TM500 module front panel plastic trim
Well that counters the OP's worry of tool and design flow disappearing, but going commercial paid is a similar problem for many non-specialists, retired and self employed. In those cases, open source
Well that counters the OP's worry of tool and design flow disappearing, but going commercial paid is a similar problem for many non-specialists, retired and self employed. In those cases, open source
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John Griessen
· #197307
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(OT) radar tube use: VCR85/ CV1085 vintage UK radar, who knows knowledgeable persons/groups
Hey! Enjoyed seeing your video!
Hey! Enjoyed seeing your video!
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By
John Griessen
· #197263
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Old Tek scope appearance
Thanks for posting this!
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John Griessen
· #196998
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7844 mode switch repair or swapping with "dedicated" version
I have a 7844 that sort of works. The mode switches are intermittent -- odd level shifts or opens happen when pushing the buttons. The board that contains vert and horiz switches and vert, horiz separ
I have a 7844 that sort of works. The mode switches are intermittent -- odd level shifts or opens happen when pushing the buttons. The board that contains vert and horiz switches and vert, horiz separ
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John Griessen
· #196770
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1A1 Fet Conversion
Do all of the FET 1A1's have four-sided V/cm knobs?
Do all of the FET 1A1's have four-sided V/cm knobs?
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By
John Griessen
· #196751
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Tektronix 7B92A time base external trigger in termination question
Sure, and those old carbon comp R's are drifted away from 50 Ohms now anyway... Not saying to go different type of R, since Carbon comp are good RF R's, just select for good value, or maybe bake some.
Sure, and those old carbon comp R's are drifted away from 50 Ohms now anyway... Not saying to go different type of R, since Carbon comp are good RF R's, just select for good value, or maybe bake some.
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By
John Griessen
· #196562
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Tektronix 7B92A time base external trigger in termination question
Sure, and those old carbon comp R's are drifted away from50 Ohms now anyway...
Sure, and those old carbon comp R's are drifted away from50 Ohms now anyway...
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By
John Griessen
· #196561
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556 scope mod 104F
One of these turned up and I wonder what the 104F mod is. Anyone? https://www.ecosensory.com/tek/556-scope-serial-numbers-3.jpg
One of these turned up and I wonder what the 104F mod is. Anyone? https://www.ecosensory.com/tek/556-scope-serial-numbers-3.jpg
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By
John Griessen
· #196361
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13) 519 scopes going going gone to scrappers....
I saw some of those tube harvesters while picking up today. They are just business-like about it. I saw one get a custom circuit with giant power amp tubes in 2 rows of 12. He'll probably plug them in
I saw some of those tube harvesters while picking up today. They are just business-like about it. I saw one get a custom circuit with giant power amp tubes in 2 rows of 12. He'll probably plug them in
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By
John Griessen
· #196177
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13) 519 scopes going going gone to scrappers....
There is not much early interest in these, so probably going to tube harvesters. https://www.bentleysauction.com/auctions/7544-1642-NM-Surplus-to-the-Ongoing-Needs-of-Pulse-Power-Physics-Online-Auctio
There is not much early interest in these, so probably going to tube harvesters. https://www.bentleysauction.com/auctions/7544-1642-NM-Surplus-to-the-Ongoing-Needs-of-Pulse-Power-Physics-Online-Auctio
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By
John Griessen
· #196160
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DSA602 useful? too huge on a bench?
Do you know the differences between DSA602A and DSA602? Only DSA602s for sale here... Thanks for the reviews. I'm probably going to get both also. 500 W is a surprise, but since I'm no longer in Texas
Do you know the differences between DSA602A and DSA602? Only DSA602s for sale here... Thanks for the reviews. I'm probably going to get both also. 500 W is a surprise, but since I'm no longer in Texas
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By
John Griessen
· #195874
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DSA602 useful? too huge on a bench?
What are your favorite features? Can you set it easily for 14 bit resolution so the lower frequency traces have detail? How is that done? Menus? What's in that big box? Are fans loud?
What are your favorite features? Can you set it easily for 14 bit resolution so the lower frequency traces have detail? How is that done? Menus? What's in that big box? Are fans loud?
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By
John Griessen
· #195865
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DSA602 useful? too huge on a bench?
I could get a a couple of these cheap locally, (one for parts), except they are not super repairable...and they are huge. Anyone like their function? Skip to 11801 or CSA803? John
I could get a a couple of these cheap locally, (one for parts), except they are not super repairable...and they are huge. Anyone like their function? Skip to 11801 or CSA803? John
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By
John Griessen
· #195863
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Tek 422 ac/dc power supply issues
I miss your input.
By
John Griessen
· #195282
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Tektronix RM503 scope
I have a parts box from a RM504 that may help, and some ceramic caps from Sandia lab that are all arranged neatly in Akro Mills organizers that could be a source also. The other way to go is take SMT
I have a parts box from a RM504 that may help, and some ceramic caps from Sandia lab that are all arranged neatly in Akro Mills organizers that could be a source also. The other way to go is take SMT
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By
John Griessen
· #195040
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How to replace an SMT part, a tutorial - desoldering surface mount components
On 6/27/22 19:10, Paul Amaranth wrote: What do you remember about the orientation? Is it an input to the control pcb, or just affecting the iron tip physics?
On 6/27/22 19:10, Paul Amaranth wrote: What do you remember about the orientation? Is it an input to the control pcb, or just affecting the iron tip physics?
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By
John Griessen
· #194423
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A flexible 7k extender?
I got a bounce trying to send to one who requested, so I put a zip file of the Gerbers on my server. I run my own mail server and it occasionally gets blacklisted by some ISPs. If you want the pcb-rnd
I got a bounce trying to send to one who requested, so I put a zip file of the Gerbers on my server. I run my own mail server and it occasionally gets blacklisted by some ISPs. If you want the pcb-rnd
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By
John Griessen
· #193638
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A flexible 7k extender? I'm thinking about it (was: 7B92 with no repeating sweep)
I sold out and have not reordered parts. Yes, RS-274X and pcb-rnd files are available -- I'll send you a zip of the project dir. It's just a straight through, so no schematic.
I sold out and have not reordered parts. Yes, RS-274X and pcb-rnd files are available -- I'll send you a zip of the project dir. It's just a straight through, so no schematic.
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By
John Griessen
· #193631
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What's the value of a C-12 camera: both the idea of what it can be used for, and is it worth anything more than being a door stop?
+1 the mounting can just be a shelf, and maybe some sawn plastic or wood holder for the camera to keep it square with the shelf and scope. The digital cameras I have take a while to turn on and get se
+1 the mounting can just be a shelf, and maybe some sawn plastic or wood holder for the camera to keep it square with the shelf and scope. The digital cameras I have take a while to turn on and get se
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By
John Griessen
· #193142
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