#garfield Logs

Nov 22 2015

01:19 rue_shop3 er, wait 1A
01:19 rue_shop3 hmm
01:21 rue_shop3 I suppose if the gate rings well into the switching voltage it dosn't matter much
01:23 ^kat^ yeas
01:24 ^kat^ if yu can get the 2222 to turn on and off n that time
03:03 rue_shop3 its an inrush to charge and discharge the fet
03:39 rue_shop3 I wonder if I can use a simpleswitcher in open loop
19:23 useless Tom, if you run out of heat, there's natural gas seeps on the east side of the 4-corners area, enough gas to kill off plants in the area
19:30 Tom_itx oh?
19:30 Tom_itx that's quite a ways from here though
20:11 rue_shop3 3/100 millionths of a second
20:11 rue_shop3 hmm
20:12 rue_shop3 3.0 0.3 0.03ms
20:12 Tom_itx just a little slice of time
20:12 rue_shop3 no, us
20:12 rue_shop3 wtf
20:13 rue_shop3 they are saying that the pulse from an eletric fence is .03us ?
20:13 rue_shop3 no
20:15 rue_shop3 15 joule energy output
20:15 rue_shop3 2 joule energy output
20:19 rue_shop3 pulse lasting for 0.0003 seconds
20:19 rue_shop3 ok again with the math
20:20 rue_shop3 .3ms
20:20 rue_shop3 300us
20:20 rue_shop3 thts better
20:22 rue_shop3 ok lets say 4J over 300us
20:22 useless 4J over 300us
20:22 rue_shop3 we should be able to get ... watts?
20:23 useless eventually
20:23 rue_shop3 units converter says 13kw
20:23 rue_shop3 so,
20:24 rue_shop3 at 5kv, thats 2.6A
20:24 rue_shop3 ok, so if I want to make a 4J inductor
20:25 useless you won't get 2.6a into the average human
20:25 rue_shop3 not for 300us with 5kv?
20:25 useless you;d destroy skin
20:26 useless there's be obvious dermal necrosis
20:27 rue_shop3 well, 4J is apparently a pretty strong fence
20:27 rue_shop3 oh, ok, 300us, 2.6A, 5000V, I should be able to work out an inductor
20:28 rue_shop3 should come to XuH
20:28 useless you don't get 2.5 amps off 15kv car ignition coil, and i've touched a few, so skin damage
20:28 useless no skin damage
20:29 useless got a worse burn off a old 24" color flyback that caught my by the watch (metal wrist band, grounded) and a ring on one finger
20:30 rue_shop3 93554mh ?
20:31 rue_shop3 93H?
20:33 rue_shop3 next page says 1H
20:40 rue_shop3 the electric fence units people are getting up here are crap, I want to make a good one, was just looking at rules, looks like if I can figure out how to size the inductor, its solved
20:40 rue_shop3 make electric fences
20:40 useless might be legal rules that they cannot hurt anyone, so they keep cranking the power *down*
20:41 rue_shop3 from what I read, electric fence powers varry between .08J and 15J
20:41 rue_shop3 good range between 1-4J
20:41 rue_shop3 pulse times not to exceed 300us
20:42 rue_shop3 the chargers I see around have meters that show up to 25kv
20:42 rue_shop3 Predators
20:42 rue_shop3 5,000-10,0000 Volts
20:42 rue_shop3 I presume that counts bears
20:42 rue_shop3 these are all for bee keepers
20:42 useless electric fence prolly doesn't affect bees
20:42 rue_shop3 ya know, I'm not sure, that comma is in a funny plave
20:43 rue_shop3 http://blog.kencove.com/volts-vs-joules/
21:31 rue_mohr kat, do you know good reading material for transistor swtiching?
21:32 useless google motorola switchmode , read the appnotes on how to apply them
21:32 rue_mohr oh, I might have those printed
21:34 rue_mohr hey, why do they have a ferrite bead on that transistors base?
21:36 useless slow edge rates just a tiny bit, and leep any current reflectons down
21:37 useless yoou shuld also know about Baker clamps
21:38 rue_mohr in this diagram there is a cap across the base resistor
21:38 rue_mohr there is a baker clamp
21:39 rue_mohr thats a lot of diodes
22:15 useless the pata power plug i mod'd and epoxied seems to work pretty darned good, after using an exacto on the hdd pins, of course
22:16 useless the diodes are usually not all the same, note that
22:16 useless the speed ratings matter
22:38 rue_mohr high voltage, less capacitance
22:40 rue_mohr I wonder what the capacitance is of a 40A 32V diode from 1-32V reverse bias
22:40 rue_mohr might be in the nf
22:41 zhanx Rue made a drill press today
22:42 zhanx Old cordless drill amd a shotgun reloader with a laptop psu
22:42 rue_mohr heh
22:43 zhanx Need to make it neater for the wiring
22:43 rue_mohr I didn't know you needed a tool to reload a shotgun
22:43 zhanx For the shells
22:43 useless reload the shells
22:44 zhanx Also shot another porcupine
22:44 zhanx I swear they want to eat my shop
22:46 useless all the different wood, it's a buffet
22:46 zhanx You know it kat
22:47 zhanx Felt bad but it was eating my door
22:48 rue_mohr "zhanx: Lost a computer today" "rue_mohr: another boot inncodent?" "zhanx: nope, shotgun"
22:48 zhanx Thinking about cutting down a tree near it and putting a salt block on it
22:48 zhanx Rue no computer in the shop yet
22:48 zhanx At least I put the axe down and used the shotgun
22:50 zhanx Oh and for my drill press, reverse is a wooden slide to swap power around (used nails for now )
22:51 rue_mohr what happened to darts?
22:51 useless it's actually not that easy to use an axe on a small animal, i broke a possums neck with an axe, never did draw blood
22:51 zhanx Game room is at home and darts are for mice
22:52 zhanx Which did die and stunk up my laundry room
22:52 rue_mohr ah, a porcupine might take a dart as a love proposition
22:52 useless yo aren't supposed to leave dead animals laing around
22:53 zhanx I am also not suppose to drive my exploder with barely any steering but I do
22:54 useless ok
22:54 useless hence i am useless, most anything i say the last 30 hrs is crap
22:54 zhanx Kat it's a joke
22:55 useless it is?
22:59 zhanx Looki at cree leds for my fish tank
22:59 zhanx Looking
23:01 rue_mohr hmm