#garfield Logs

Dec 07 2023

09:44 AM aandrew: huh. MMBT3904 Vbesat is minimum 0.65V, max 0.85V when Ic=10mA and 0.95V (?!) when Ic=50mA
09:55 AM aandrew: it looks like taking the typical 0.7V value is actually going to cause my current regulation to be on the high side
09:55 AM aandrew: (emitter follower application: 5V to LED, LED to collector, emitter to current-setting resitor, to ground)
09:55 AM aandrew: Vbe = 0.7V typically, so there will be 0.7V across the resistor. R=V/I, so if I want 10mA that'll be 70 ohms
06:08 PM rue_mohr: yea the 0.7 isn't a real-world number
06:08 PM rue_mohr: oh you didn't use math to work it out did you?
06:08 PM rue_mohr: get it in the ballpark and trim it with soemthing adjustable
06:20 PM aandrew: I use 0.7 to get it in the ballpack
06:20 PM aandrew: worked out to 70 ohms, I'm using 68.1 since that's the closest e192
06:20 PM aandrew: that actual value isn't important
08:05 PM rue_mohr: my auto-correction didn't work for a second there and I read what that first line said...
08:05 PM rue_mohr: as opposed to what you meant...
09:13 PM rue_mohr: so far this week has been an energy disaster, so didn't get any sprayer work done
09:20 PM Tom_L: you're kinda on your own on those now aren't ya?
09:20 PM rue_mohr: 100%
09:20 PM rue_mohr: I'm not sure if I should try and find someone interested
09:21 PM rue_mohr: I dont think there is
09:21 PM Tom_L: no leads ehh?
09:21 PM Tom_L: well we simplified a couple of the steps
09:22 PM rue_mohr: yup!
09:23 PM rue_mohr: and there is more in the works
09:23 PM Tom_L: such as?
09:23 PM rue_mohr: I have next week off on vaccation
09:23 PM rue_mohr: the hole saw thing
09:23 PM Tom_L: oh yeah
09:23 PM Tom_L: do they all get clipped like that?
09:24 PM Tom_L: that's for the A9 clearance right?
09:24 PM Tom_L: or something like that
09:24 PM rue_mohr: makes the tube clear the can
09:24 PM Tom_L: oh
09:24 PM rue_mohr: just under the head slot
09:25 PM Tom_L: i noticed that one that had bailing wire on it.. somebody must have done a field repair :)
09:25 PM rue_mohr: yep!
09:26 PM rue_mohr: there are parts robbed off some too
09:26 PM Tom_L: i was gonna dig into my pendant but was just to pooped
09:26 PM rue_mohr: yea
09:26 PM rue_mohr: I did not catch up on sleep this week
09:26 PM Tom_L: at least the mill runs good now
09:26 PM rue_mohr: and tommorow I'm a whole year older
09:26 PM rue_mohr: nice
09:27 PM Tom_L: happy born on date
09:27 PM Tom_L: i'd just as soon forget those now
09:27 PM rue_mohr: need to turn myself into a robot
09:27 PM rue_mohr: hmm
09:27 PM Tom_L: i still got probably 20 more on ya
09:27 PM rue_mohr: it is amazing I'm still alive
09:28 PM Tom_L: i lost track
09:28 PM rue_mohr: how the close calls?
09:28 PM rue_mohr: of the close calls?
09:28 PM Tom_L: forgot your age
09:29 PM rue_mohr: meh, it can be calculated
09:29 PM Tom_L: my SS will kick in in Feb
09:30 PM rue_mohr: I presume one of those S' is for social
09:30 PM Tom_L: yup
09:31 PM Tom_L: you know you're getting old when you look around and have alot fewer friends
09:31 PM rue_mohr: so whats my todo list for next week
09:31 PM Tom_L: i could run those other 2 parts but i'll never use em so i don't see much point
09:32 PM rue_mohr: I failed to be able to mold a raindeer
09:32 PM Tom_L: i completely forgot about that
09:32 PM rue_mohr: the temp is super pickey
09:32 PM Tom_L: how's the other mold holding up?
09:32 PM rue_mohr: too low and its hard, too hot and it boils
09:33 PM rue_mohr: the trigger ones?
09:33 PM Tom_L: yeah
09:33 PM rue_mohr: really good considering
09:33 PM rue_mohr: they are just black, not really and scale or erosion
09:33 PM Tom_L: that doesn't hurt anything
09:33 PM rue_mohr: I'v gone thru 3 ladels
09:33 PM rue_mohr: totally eaten out
09:33 PM Tom_L: heh
09:34 PM Tom_L: get a good graphite one and that won't happen
09:34 PM rue_mohr: I have a big bag of blanks from the last run
09:34 PM rue_mohr: not even QC'd yet
09:35 PM Tom_L: do you put that soda or whatever it is on top and skim it?
09:35 PM Tom_L: to clean the aluminum
09:35 PM rue_mohr: borax is a flux
09:35 PM Tom_L: yeah that
09:35 PM rue_mohr: sometimes
09:35 PM Tom_L: that's soap isn't it?
09:35 PM rue_mohr: I sent you a cast trigger with that kit didn't I?
09:35 PM rue_mohr: yea
09:36 PM rue_mohr: ^ yea its soap
09:36 PM Tom_L: i think so
09:36 PM rue_mohr: mm
09:36 PM rue_mohr: still not tried to cut steel on the cnc yet
09:36 PM Tom_L: it will grumble
09:36 PM rue_mohr: I got the spare belts tho
09:36 PM Tom_L: but it should do it ok
09:36 PM Tom_L: just slow
09:37 PM rue_mohr: I got the meters for showing load
09:37 PM rue_mohr: not installed yet
09:37 PM Tom_L: iirc i ran around 1.5 - 2k rpm
09:37 PM Tom_L: 4 flute
09:37 PM rue_mohr: mine goes to... 3k?
09:37 PM Tom_L: i dunno
09:37 PM rue_mohr: or 6
09:37 PM Tom_L: mine goes to 5.5k rpm
09:37 PM Tom_L: but i seldom go past 4k
09:38 PM rue_mohr: never tried milling clad on it did you?
09:38 PM Tom_L: clad/
09:38 PM Tom_L: ?
09:38 PM Tom_L: what type
09:38 PM rue_mohr: FR4
09:38 PM Tom_L: no
09:38 PM Tom_L: i won't
09:38 PM Tom_L: i did on the sherline
09:39 PM Tom_L: but i didn't have much luck. too uneven
09:39 PM rue_mohr: hmm
09:39 PM Tom_L: and wrong cutters
09:39 PM Tom_L: and it will dull your cutter real quick
09:40 PM Tom_L: it was just easier for me to etch them
09:40 PM Tom_L: then i got lazy and just ordered boards
09:41 PM rue_mohr: polished copper christmas ornaments cut out of clad?
09:41 PM rue_mohr: a ball, a gingerbread person, a candy cane
09:42 PM Tom_L: i was kinda surprised i was able to cut that needle from the cd
09:42 PM rue_mohr: is it politically incorrect to call a gingerbread man ginger? :D
09:42 PM rue_mohr: that was fun
09:42 PM rue_mohr: try a whole snowflake from a cd! I think only 1/5 of them worked for me
09:43 PM rue_mohr: not sure where that pattern is
09:43 PM rue_mohr: I just found stuff on google and vectorized it
09:44 PM rue_mohr: I give up, I'm going to bed now, I'm being otherwise useless
09:44 PM rue_mohr: made a partial list for my time off
09:45 PM Tom_L: yup, i've about had it too
09:46 PM Tom_L: upset stomach though
09:49 PM rue_mohr: :/
09:49 PM Tom_L: may end up sleeping in the chair
09:51 PM Tom_L: gnite