#garfield Logs
Mar 07 2020
#garfield Calendar
02:09 AM polprog: rue_mohr: hmm, i havent thought of that. Ill take a look. Maybe its the usual failure that the cap was being only charged by the gate current, and the scr was always off...
02:14 AM polprog: discharged*
05:38 AM polprog: i found a big fuse today.. no markings so no idea of the current capability but its not blown
05:39 AM polprog: https://i.ibb.co/MhrJ9Rf/IMG-20200307-113603.jpg
05:40 AM polprog: we had these at the power distribution room
05:40 AM polprog: 3 pcs for 1 phase each
05:40 AM polprog: this will make a fine paperweight
07:20 AM Tom_L: rue_mohr, same for toroids?
07:22 AM Tom_L: fluke looks like one i have
07:22 AM Tom_L: iirc mine may be a 77
07:22 AM Tom_L: don't recall right now
07:24 AM Tom_L: yes, looks identical though
07:38 AM polprog: ive seen one fluke like that with british (?) railway logo. Yellow case with black markings. neat
07:47 AM Tom_L: mine has a rubber case you could probably drop 3 storries and be ok
07:54 AM polprog: these are nice. the guy i bought mine from didnt have the condom
07:55 AM polprog: mines pretty beaten up... the case is cracked (for some reason the epoxy didnt weld it and it cracked again)
07:55 AM polprog: screwposts inside were broken off and gone
07:55 AM polprog: its held together with 1 screw..
07:55 AM polprog: i had to clean the LCD pads to fix up a missing segment
07:55 AM polprog: but it works fine now
07:55 AM Tom_L: i've had mine for many years
10:26 AM polprog: how do you call a hobbyist electronic
10:26 AM polprog: im looking for a word
10:45 AM rue_bed: Tom_L, toroid? the one I did was a transformer?
10:45 AM rue_bed: something else?
10:46 AM rue_bed: hobby electronics ?
10:47 AM rue_bed: i.ibb is timing out
10:59 AM rue_mohr: yes
11:00 AM rue_mohr: was I working on one?
11:00 AM rue_mohr: the one I did for the motor driver is a double E
11:07 AM Tom_L: i know, i was just thinking how you calculate windings vs voltage & current
11:16 AM Tom_L: not that i plan on winding anything any time soon...
11:18 AM rue_mohr: oh ferrite is totally different
11:18 AM Tom_L: i figured it might be
11:54 AM polprog: rue_mohr: have you got the new version of the gallery script somewhere?
11:54 AM rue_mohr: did I change anything?
11:54 AM rue_mohr: wait I linked it all
11:54 AM polprog: you added the next photo as a thumbnail so that its in cache already
11:55 AM rue_mohr: ah yes, and broke the constraining
11:55 AM polprog: hmm
11:55 AM rue_mohr: you were right, verticle is better
11:55 AM polprog: i can try myself to fix that up
11:55 AM rue_mohr: http://ruemohr.org/~ircjunk/projects/cnc6/slide.htm
11:55 AM polprog: not urgent, iw as just asking
11:56 AM rue_mohr: all the projects use it, cause I just symlinked it
11:56 AM polprog: same
11:56 AM rue_mohr: I also added a provision for readme.txt
11:56 AM rue_mohr: it will append the contents at the bottom if the file exists
11:56 AM rue_mohr: but I'd wished I'd used readme.htm
11:57 AM polprog: you can add text below i think
11:57 AM rue_mohr: oh
11:57 AM rue_mohr: there is a snag with that
11:57 AM rue_mohr: so
11:58 AM rue_mohr: I have a custom 404 page
11:58 AM rue_mohr: and the only way to tell if I had gotten the 404 page back, or a real readme.txt was via a flag IN my 404
11:58 AM rue_mohr: document.getElementById('desc').contentWindow['fourofour'] !== 1
11:59 AM rue_mohr: because, when you get the 404 page, it gives back a valid get reply
11:59 AM rue_mohr: (!?!?!)
11:59 AM rue_mohr: aka, http://ruemohr.org/LKJLSKDJFLKJSDLFKJSDFLKJ.htm is not a 404, because my 404 page returns as 200
12:00 PM rue_mohr: in my 404 page:
12:00 PM rue_mohr: <script type="text/javascript">
12:00 PM rue_mohr: var fourofour = 1;
12:00 PM rue_mohr: </script>
12:00 PM rue_mohr: if you know a better way, I'd love to know
12:03 PM polprog: o-O
12:03 PM polprog: well... return 404?
12:04 PM rue_mohr: I dont know how to make a custom 404 page that returns 404
12:04 PM polprog: hmm
12:04 PM polprog: i dont know either
12:04 PM polprog: wait..
12:04 PM polprog: naw my error pages are default
12:04 PM rue_mohr: http://ruemohr.org/sadfsdfsdf.html
12:04 PM polprog: how do you have that set as 404 page?
12:04 PM polprog: it must be a config line in the same place in the config
12:04 PM polprog: btw
12:05 PM rue_mohr: something I did in the apache config
12:05 PM polprog: https://polprog.net/zenit/graffiti/test.html
12:05 PM polprog: new version is here
12:05 PM polprog: imma move it to index.html in a sec
12:05 PM polprog: oh this looks surprisingly simple... https://httpd.apache.org/docs/2.4/custom-error.html
12:05 PM rue_mohr: ok, did you just zerp the readme for now?
12:06 PM polprog: wait.. the readme
12:06 PM polprog: no i just included the thumnail code in my slider.js
12:06 PM polprog: since we have a separate html file for each slider i dont see why the readme would need to be loaded with js
12:07 PM polprog: https://polprog.net/zenit/slider.js my current js version
12:09 PM rue_mohr: ah, the idea is that you drop a readme in each folder, that has a description for that folder of images.
12:09 PM polprog: hmm, sensible
12:10 PM rue_mohr: which is why I resented not having made it html from the start
12:11 PM rue_mohr: http://ruemohr.org/~ircjunk/projects/cncpendant2/slide.htm
12:11 PM rue_mohr: with a readme
12:13 PM rue_mohr: oh I wonder if I didn't use errordocument, if I used a redirect
12:22 PM polprog: using errordocument makes it return the read errorcode
12:22 PM polprog: i have it set locally to ircjunk in htaccess
12:22 PM polprog: locally to 404.html in ircjunk*
12:22 PM polprog: https://polprog.net/rozne1/ircjunk/nonexistent
12:38 PM rue_mohr: ok, I'm going to get breakfast and look at that
12:39 PM rue_mohr: did I leave in the code that looks for a real 404?
12:44 PM Tom_L: open .htaccess file and add: ErrorDocument 404 /new404.html or ErrorDocument 404 /error_pages/new404.html etc
12:44 PM rue_mohr: yea I think that makes it reply with 200 for a 404
12:44 PM polprog: no
12:45 PM Tom_L: https://www.digitalocean.com/community/tutorials/how-to-create-a-custom-404-page-in-apache
12:45 PM polprog: thats what i have now
12:45 PM polprog: you can curl it or seen in the network tab in web tools in firefox
12:45 PM rue_mohr: then why is my 404 page a code 200?
12:45 PM Tom_L: cause you didn't do it right?
12:45 PM polprog: ^ :P
12:47 PM rue_mohr: .. how DID I do it?
12:47 PM Tom_L: https://www.ait.com/support/11456-create-a-custom-404-page-in-apache
12:47 PM Tom_L: same basic idea
12:48 PM rue_mohr: oh its IN public_html..
12:49 PM rue_mohr: ErrorDocument 404 http://ruemohr.org/erp/main.html
12:49 PM rue_mohr: ^^^ THAT causes the 404 page to come back as 200
12:49 PM polprog: well
12:49 PM polprog: since that redirects to a valid page
12:49 PM polprog: you need to put
12:49 PM polprog: ErrorDocument 404 /erp/main.html
12:49 PM Tom_L: i don't think it's supposed to be a http address at that point
12:49 PM polprog: or whatever the path is
12:49 PM polprog: yeah
12:50 PM Tom_L: rather the path on your server
12:50 PM Tom_L: that's what apache is looking for
12:50 PM rue_mohr: lets try it
12:51 PM Tom_L: Keep in mind that the Apache looks for the 404 page located within the site's server root.
12:51 PM rue_mohr: ok, its modified
12:52 PM rue_mohr: ErrorDocument 404 /erp/main.html
12:52 PM rue_mohr: hah, the content for the error is broken
12:52 PM rue_mohr: http://ruemohr.org/~ircjunk/sdkjfasl;kdf
12:52 PM Tom_L: i'd consider calling it 404.html or such since it's not your main page
12:52 PM rue_mohr: but it didn't redirect
12:52 PM polprog: haha
12:52 PM polprog: might need to put absolute links in the page
12:52 PM Tom_L: you should copy that jpg too
12:52 PM rue_mohr: but I dont know what the code was
12:53 PM polprog: all the stuff is in erp so you need the full paths
12:53 PM Tom_L: Request URL: http://eds.dyndns.org/~ircjunk/
12:53 PM polprog: http://ruemohr.org/erp/
12:53 PM Tom_L: instead of there
12:53 PM rue_mohr: I'd like it outside of ircjunk
12:53 PM Tom_L: so move it
12:54 PM rue_mohr: its where I want it
12:54 PM rue_mohr: I'm working on whats up with the path to the images
12:55 PM rue_mohr: ok...
12:57 PM rue_mohr: where the hell is the holding arm project
12:58 PM Tom_L: i dunno, i tend to put my fpga projects in the avr folder
12:58 PM rue_mohr: http://ruemohr.org/~ircjunk/projects/tiltnpanmirror/slide.htm
12:58 PM Tom_L: :)
12:58 PM rue_mohr: ok, so thats with a readme.txt
12:59 PM rue_mohr: http://ruemohr.org/~ircjunk/projects/reprap/slide.htm
12:59 PM rue_mohr: and thats without
12:59 PM rue_mohr: ok good, the 404 page is not being appended to the slides so far
12:59 PM rue_mohr: now I'll pull the javascript
01:01 PM rue_mohr: nope
01:03 PM rue_mohr: oh the ONLY code right now looks for that tag
01:04 PM rue_mohr: <iframe id="desc" src="readme.txt" onload="SetDesc();" style="display: none;"></iframe>
01:05 PM rue_mohr: "load a file but tell me if its the 404 page" seems to be hard
01:10 PM rue_mohr: <script src="file:///SSC_Temp/html_005/temp/Support/jquery.js" onerror="alert('error1');" onload="alert('load');" type="text/javascript" ></script>
01:10 PM rue_mohr: there might be something to that method
01:11 PM rue_mohr: so Tom_L[m]
01:13 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1150416.jpg
01:13 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1150418.jpg
01:13 PM rue_mohr: I'm playing with this switch desgin
01:14 PM rue_mohr: and I need a jig to bend the bracket, but I'm not sure how to keep it centered
01:14 PM rue_mohr: hmm, unless I dont try to bend both sides at once...
01:19 PM Tom_L: got any box aluminum extrusion?
01:19 PM rue_mohr: heh, no
01:19 PM Tom_L: slice it down the middle and you'll have 2
01:20 PM rue_mohr: gonna have to bend these
01:20 PM Tom_L: make a metal block for the inside and bend it
01:20 PM Tom_L: got a hydropress?
01:21 PM Tom_L: good candidate for a hydropress
01:21 PM rue_mohr: its on my list...
01:21 PM Tom_L: ~2.5 deg springback
01:21 PM rue_mohr: :) ok
01:21 PM Tom_L: i've made quite a few forms for those
01:22 PM rue_mohr: hydropress, 2x moulds?
01:22 PM rue_mohr: put the peice in the middle and squeeze?
01:23 PM Tom_L: put the piece on top and squeeze
01:23 PM Tom_L: it forms all 4 sides
01:23 PM Tom_L: or 10 depending on the part
01:23 PM rue_mohr: hmm I need a pic
01:24 PM rue_mohr: https://sc01.alicdn.com/kf/HTB1A7arSVXXXXbTXpXXq6xXFXXXu/HM-500A-Automatic-Paper-Rigid-Box-Forming.jpg
01:24 PM rue_mohr: ?
01:25 PM Tom_L: https://books.google.com/books?id=5ouKDQAAQBAJ&pg=SA8-PA49&lpg=SA8-PA49&dq=hydroblock+forms+for+hydropress&source=bl&ots=oIUVrtp06T&sig=ACfU3U2juX6ka5wno02g3qYI25ZrPNRgpA&hl=en&sa=X&ved=2ahUKEwjui7PliYnoAhUEC6wKHTHHBcIQ6AEwB3oECA0QAQ#v=onepage&q=hydroblock%20forms%20for%20hydropress&f=false
01:25 PM Tom_L: uses a large bladder to press around a form with a sheet metal on top of it
01:25 PM rue_mohr: oh, with a baloon
01:25 PM rue_mohr: huh
01:26 PM Tom_L: yup
01:26 PM Tom_L: tons of force
01:26 PM rue_mohr: just a few days ago I was watching a video of a guy packing a box with rubber and squeezing the hell out of it to make formed sheet for airplanes
01:26 PM Tom_L: similar
01:27 PM Tom_L: on a hydropress form, you undercut the sides for sheetmetal springback
01:28 PM rue_mohr: I have an idea
01:28 PM rue_mohr: its inspired by
01:28 PM rue_mohr: but its not hydropress
01:28 PM Tom_L: just bend them in a vise
01:28 PM rue_mohr: I wonder if I should make a super duty pot for hydroforming
01:29 PM rue_mohr: how many tones is my press?
01:29 PM rue_mohr: hmmm
01:29 PM Tom_L: not enough
01:30 PM Tom_L: see, on yours you could have an inside and outside form and just smash the outter one over the part
01:30 PM Tom_L: like they do pop cans
01:30 PM rue_mohr: yup, I considered that
01:31 PM rue_mohr: I'm going to try a wrap former
01:31 PM Tom_L: has to happen quick though not slow
01:31 PM Tom_L: the metal work hardens
01:31 PM rue_mohr: a square peice i put the blank in and 'roll' it around the former
01:31 PM Tom_L: probably would tear if you went slow
01:31 PM Tom_L: kinda what i suggested
01:31 PM rue_mohr: hmm
01:42 PM rue_mohr: ok, I have something to try
01:42 PM rue_mohr: I'm bad at that bend-offset thing
01:43 PM rue_mohr: I actually dont have a good hand prototype yet
01:55 PM rue_mohr: hmm, suppose I get the cnc to cut a few blanks out
01:55 PM rue_mohr: too bad alumium wont re-bend
02:28 PM Tom_L: not unless you anneal it again
02:29 PM Tom_L: i learned about age hardening the other day
02:29 PM Tom_L: i didn't realize what happened
02:29 PM Tom_L: not the same as normal hardening
02:30 PM Tom_L: letting aluminum sit causes the crystals? atoms? to align over time and increase the strength
02:31 PM Tom_L: https://www.azom.com/article.aspx?ArticleID=9623
02:35 PM rue_mohr: hmm
03:16 PM Tom_L: that's what made aluminum possible to use on aircraft and spacecraft
03:19 PM rue_mohr: the "1/8" bit on the cnc, thats really a 3mm is 2.76mm
03:19 PM rue_mohr: having fun with getting the cut right
03:25 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1150420.jpg
03:26 PM rue_mohr: its something to make adjustments from anyhow
03:32 PM Tom_L: what's the plastic for?
03:32 PM rue_mohr: its a switch
03:33 PM Tom_L: looks like a block of plastic
03:33 PM rue_mohr: the paddles hit two buttons
03:33 PM rue_mohr: oh that
03:33 PM rue_mohr: its the form
03:33 PM rue_mohr: you stick the end in, lock it with a pin, and bend the metal around it
03:33 PM rue_mohr: I didn't get the thickness compensation right
03:33 PM Tom_L: i would have cut a wood or aluminum block and smashed the part around it
03:34 PM rue_mohr: yes, but beings its wrong, i can have the 3d printer make me a new one
03:34 PM rue_mohr: that pla is pretty damn strong
03:34 PM Tom_L: wood is cheaper
03:34 PM rue_mohr: halted a shredder with a damn big gearbox
03:35 PM Tom_L: so you slide it in and pin it then bend one side and flip and repeat
03:35 PM rue_mohr: I'm having the cnc cut out the metal strip now, I can tune
03:35 PM rue_mohr: no, you just keep bending around it
03:35 PM rue_mohr: I didn't put the rake in it tho
03:36 PM Tom_L: and how much at 90 deg does it spring back?
03:36 PM rue_mohr: and I'm out by 1mm as per material thickness
03:36 PM rue_mohr: I'm mauling them too much to be able to tell just yet
03:36 PM Tom_L: you can calculate it but we found between 2-3 degrees, nobody bitched about it
03:37 PM Tom_L: so we just ground and endmill on the angle
03:41 PM rue_mohr: Oo
03:41 PM rue_mohr: like sharpen or reshape?
03:42 PM Tom_L: / \
03:42 PM Tom_L: https://www.custompartnet.com/calculator/bend-allowance
03:43 PM Tom_L: most cad packages will calculate the bend deduction for you if you use their sheetmetal plugins
03:44 PM Tom_L: i've got a feature on catia that can unroll a shape for a flat pattern
03:47 PM rue_mohr: ok, gee, keeping the machines fed is being laborious
03:47 PM Tom_L: what machines?
03:47 PM Tom_L: and why are you starving them?
03:48 PM rue_shop1: with a linear former like this, the former sets the distances, and the question ends up "did I make it the right length to the last hole
03:48 PM rue_shop1: ?"
03:48 PM Tom_L: drill them last
03:49 PM Tom_L: make a jig for that too
03:49 PM Tom_L: clamp the U in the piece and drill it thru
03:49 PM rue_shop1: cutting sheetmetal with the vert bandsaw is so much easier, that said, I should use it
03:49 PM rue_shop1: hmm
03:51 PM Tom_L: how many do you need anyway?
03:59 PM rue_shop1: dunno
03:59 PM rue_shop1: maybe about 24
04:00 PM Tom_L: you can't print the flange too?
04:07 PM rue_shop1: I want it thin
04:07 PM rue_shop1: so it can fit between adjacent levers
04:09 PM Tom_L: make a gang flange
04:11 PM rue_mohr: I was pondering
04:11 PM rue_mohr: the conclusion was that a single one is modular, I can make things whatever size I want
04:12 PM rue_mohr: and that if I can make them stupid-easy to make, the large count of them doens't matter
04:13 PM Tom_L: i can tell you if you try to machine the radius around the end in open air it will snap the cutter
04:14 PM Tom_L: holding it by the base sideways (vertical)
04:23 PM rue_mohr: :)
04:24 PM rue_mohr: cant get the bend by hand on the desk tho
04:24 PM rue_mohr: has to be the arbour
04:26 PM polprog: i wonder what frequency are these ethernet magnetics good at
04:26 PM rue_shop1: oh wow thats wrong
04:26 PM polprog: i was trying to make a 2v5 supply for the VFD filaments..
04:26 PM rue_shop1: polprog, looks like 10Mhz to 200
04:27 PM polprog: well, that reassures my idea now.. that i should try couple mhz not 60khz
04:27 PM polprog: i have this idea of making a 15V charge pump and a 2v5 filament supply on one hct14
04:27 PM polprog: and a couple jellybean parts
04:28 PM polprog: i have the charge pump running nicely
04:29 PM polprog: i could lay it out and make a couple PCBs for various VFD projects
04:29 PM polprog: since i have quite some VFDs
04:29 PM rue_shop1: I'm 1.2mm long
04:29 PM polprog: hey! i could use a low side PWM driver to PWM the VFD segments..
04:31 PM rue_mohr: yup
04:31 PM polprog: that would be cool
04:32 PM Tom_L: did your buddy get an fpga?
04:32 PM polprog: i think he ordered and is trying ot get ise up and running
04:33 PM polprog: i dont remember if (apart from bringing back the old net interface name) some special dance is necesary
04:33 PM polprog: just run the installer...
04:36 PM Tom_L: does he have a jtag that will work for it?
04:41 PM polprog: he wants to get the xilinx programmer
04:42 PM rue_shop1: $$$$
04:42 PM polprog: hmm, 8.2MHz, 2:1 ratio, 450mVrms into 10kohm. Not enough for VFD filaments
04:45 PM Tom_L: the clone like mine?
04:45 PM Tom_L: it works great and wasn't that bad
04:55 PM polprog: probably that one
04:55 PM polprog: huh, this adsl isolator works way better
04:56 PM polprog: 2.5Vrms into 10kOhm
04:56 PM polprog: at 10MHz
04:56 PM rue_mohr: ooo I'v not played with those
04:57 PM rue_mohr: are you sure its an isolator and not a diff filter?
04:57 PM polprog: hmm
04:57 PM polprog: yeah youre right, it was pulled form the phone jack side
04:57 PM rue_mohr: maybe maybe not
04:57 PM polprog: not the ehternet or docsis side
04:58 PM rue_mohr: I found a really good one out of a digital phone till I realized it was a coupled inductor and not an isolator
05:00 PM polprog: hmm, i took a diff filter now and it peaks at 5Vrms
05:00 PM polprog: into 10kohm
05:00 PM polprog: this might be the path
05:00 PM rue_mohr: :)
05:00 PM polprog: i need to wind some of my own inductors.. maybe i could even handle a signgle inductior for 15 and 2.5V
05:00 PM rue_mohr: you only need the filament drive?
05:01 PM polprog: ideally id want to build a filament + grid voltage driver
05:01 PM rue_mohr: can I suggest trying the bipolar drive transformer from a switching power supply (PC supply)
05:01 PM polprog: so 5V in, 2.5VAC + 15VDC out
05:01 PM polprog: ive got many of these
05:01 PM rue_mohr: how much grid do you want?
05:01 PM rue_mohr: 15?
05:01 PM rue_mohr: only?
05:01 PM polprog: more less 15
05:01 PM polprog: maybe 20
05:01 PM polprog: you know what
05:02 PM polprog: i have to retest all these transformers at 10MHz
05:02 PM rue_mohr: ok, cause you can get 24 out of the primary side of a pushpull from a bipolar drive transformer
05:02 PM rue_mohr: (12 in)
05:02 PM polprog: if any regulation, id regulate the 2v5 rail
05:02 PM rue_mohr: I dont know if 12V in gives you enough out, they dont give the bases much
05:02 PM rue_mohr: it would just be fix, cause push-pull
05:03 PM polprog: id rather have this run from 5V
05:03 PM rue_mohr: aaah
05:03 PM polprog: the HV side can be a charge pump even
05:03 PM rue_mohr: well
05:03 PM rue_mohr: welllll
05:03 PM rue_mohr: I'v never tried this, but it should work...
05:03 PM rue_mohr: THIs...
05:04 PM polprog: well, now ill hit the hay, leave you with this idea since tomorrow morning im up to scan the bazaar for unusual items like every sunday ;)
05:05 PM polprog: oh
05:06 PM polprog: well this is impressive
05:06 PM polprog: i took a 1:1 inductor that i got, and it gives me 11Vrms into 10kOhm
05:06 PM polprog: just like that
05:06 PM polprog: i like it...
05:06 PM rue_mohr: ...
05:06 PM rue_mohr: this... idea...
05:07 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1150423.jpg
05:07 PM rue_mohr: I'v never dont a charge pump like that from a transformer
05:07 PM rue_mohr: so it starts with 5V, the transformer adds, 10V, twice.
05:08 PM rue_mohr: you might get about 25V out?
05:08 PM polprog: i was thinking use the rest of the hct14 for a charge pump,, but
05:08 PM rue_mohr: TL494
05:08 PM polprog: hmm
05:08 PM rue_mohr: has: timer, flipflop, driver transitors. in 16p DIP
05:08 PM polprog: nice
05:08 PM rue_mohr: wont go to 50%, goes to like 49.6 or something stupid
05:09 PM rue_mohr: usually not an issue
05:09 PM rue_mohr: if you can, please give it a try
05:09 PM rue_mohr: I'd like to see how it does
05:10 PM polprog: the tl494? or the charge pump + transformer idea?
05:10 PM rue_mohr: I'm busy making switches for a pointless distraction to make a switch for an osi300 work-alike
05:10 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1150423.jpg
05:11 PM rue_mohr: ^^ tl494, transformer, and charge pump
05:11 PM rue_mohr: the transformer generates an extra 5V for the charge pump
05:11 PM rue_mohr: that transformer MIGHT work if its a PC PSU base drive transformer
05:12 PM rue_mohr: oh no, I gotta run for a bit
05:12 PM polprog: okay
05:12 PM polprog: ill see if i can get that IC tomorrow
05:13 PM polprog: meanwhile 1 diode and a cap on the secondary gives me 16V easily
05:14 PM rue_mohr: old pc supply
05:14 PM rue_mohr: 7500 is the same chip iirc
05:14 PM rue_mohr: or any xx494
05:14 PM polprog: heh, the 2n7000 needs cooling
05:14 PM rue_mohr: heh
05:17 PM polprog: hmm, nope. the PSU board i have here has some unidentifiable ic
05:17 PM rue_mohr: what pn?
05:17 PM rue_mohr: 16 pin chip?
05:18 PM polprog: yes, says 2005Z then KA469300625H
05:19 PM rue_shop1: kenwood?
05:19 PM polprog: no
05:22 PM polprog: https://polprog.net/rozne1/ircjunk/dcdc/chinaIC.png
05:22 PM polprog: https://polprog.net/rozne1/ircjunk/dcdc/handwound1_10mhz.png
05:24 PM polprog: thats at 15MHz actually...
05:24 PM polprog: ok, time to sleep
05:26 PM Tom_L: meh
05:28 PM polprog: ill ad tl5001 and tl494 to the list
05:30 PM polprog: ISL7104
05:30 PM polprog: Radiation Tolerant Single-Ended Current Mode PWM Controller
05:30 PM polprog: sounds cool
05:38 PM polprog: i wonder if theres an easy way to tell the permeability of a toroidal core
05:38 PM polprog: ive got some unknown ones here
06:20 PM Tom_L: http://zpostbox.ru/how_to_determine_permeability_of_unknown_cores_online_calculator.html
07:23 PM rue_mohr: ok, I'm back
07:23 PM rue_mohr: wow
07:23 PM rue_mohr: LOTS of batteries
07:23 PM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/p1150426.jpg
07:24 PM Tom_L: garden variety
07:31 PM rue_mohr: yea
07:38 PM rue_shop1: I think I got it
07:40 PM rue_mohr: hah, thats it!
07:40 PM rue_mohr: only took 5 tries
07:40 PM Tom_L: what?
07:40 PM rue_mohr: that bracket
07:40 PM Tom_L: oh
09:09 PM rue_mohr: so did you guys make a form cutter today then?
09:17 PM Tom_L: ?
09:19 PM Tom_L: change your clocks
09:36 PM rue_mohr: my clocks do that
09:37 PM Tom_L: what form cutter are you talking about?
09:37 PM rue_mohr: you said you and the kid were grinding a milling bit
09:38 PM Tom_L: no, this was back when i was helping my bud in his shop
09:38 PM rue_mohr: ah
09:38 PM Tom_L: we did alot of hydroblocks for cessna
09:38 PM Tom_L: real non critical dimensions like +- .030"
09:39 PM rue_mohr: do, part of the reason I got the press was to hold hydraulic molds
09:39 PM rue_mohr: take a pocket, put a sheet metal over it, seal a top over that, and pump in hydraulic oil
09:40 PM rue_mohr: form the metal to the pocket with the oil
09:40 PM Tom_L: this is all fluid pressure in a bladder
09:40 PM rue_mohr: I suppose adding a bladder makes it easier
09:40 PM rue_mohr: I have a hydraulic hand pump, but I also have a pressure washer
09:40 PM Tom_L: contains the fluid so it will work
09:40 PM Tom_L: otherwise all you'd do is build pressure
10:06 PM rue_mohr: it would be nice to have a pressure guage on my hydraulic press
10:06 PM rue_mohr: know how much force
10:07 PM rue_mohr: to my knowledge, there are no available high press taps
10:09 PM Tom_L: high press taps?
10:09 PM rue_mohr: there is nowhere I can take off the high pressure of the jack to add a pressure guage
10:09 PM Tom_L: you can get high pressure guages
10:09 PM Tom_L: add a T to it
10:09 PM rue_mohr: where
10:09 PM rue_mohr: its a bottle jack
10:09 PM Tom_L: just use machined fittings
10:09 PM Tom_L: o
10:10 PM rue_mohr: I should go and use my new bender to try to make a box
10:10 PM Tom_L: or bend some hinges
10:11 PM rue_mohr: ? do tell
10:11 PM rue_mohr: ah, I should go measure the batteries I got
10:12 PM Tom_L: the hinges you were working on.. bend them on the press
10:17 PM Tom_L: i had a power pack i got from my bud i was gonna do something with but never did
10:17 PM Tom_L: finally gave it to somebody
11:28 PM rue_mohr: its a bracket
11:28 PM rue_mohr: for the switch
11:28 PM rue_mohr: I made that printed peice to bend it
11:28 PM rue_mohr: I'm cutting a pile of them on the cnc just now
11:42 PM rue_shop1: arg, I always forget to check the freaking clamps
11:42 PM rue_shop1: came loose again