#garfield Logs

Mar 17 2015

00:07 katsmeow-afk idea ... take or leave, IRF9540 is almost exact same price, 100v tho
00:07 katsmeow-afk it's 114mohm, but that doesn't matter in this app
00:07 katsmeow-afk since you are needing to use 4 of them
00:08 katsmeow-afk i didn't check the datasheet past page 1
00:08 rue_house I do already have the 4905
00:08 katsmeow-afk ok
00:09 katsmeow-afk it's a 55v part, you are running it at 32v, which is good nuff, really
00:10 katsmeow-afk if you were using a n-chan there, 32v + 12Vgate is getting too close to 50v for comfort
00:10 rue_house AND the N channel would dump its drive signal innto th output
00:11 rue_house I worked hard to find that P channel :)
00:11 katsmeow-afk you got capacitive coupling either way
00:11 tsmeow-afk
00:11 katsmeow-afk for 20mohms in a p-chan, good find
00:12 rue_house :)
00:12 rue_house my intention was to use it for switching, thats why I was having problems with the N channel
00:12 rue_house the switching freqs were passing right thru
00:13 rue_house from the gate
00:14 katsmeow-afk reminds me, if you can turn down the 32v switcher along with the output, yo cansave onpower diss in the IRF4905's
00:14 rue_house haha wolfram alpha is awesome
00:15 katsmeow-afk ?
00:15 rue_house I gave it (1-(1/e^x)) = 0.16 and it solved for x
00:16 katsmeow-afk it solved for the exponent??
00:16 rue_house my tau is about 15u, it says a 1 sec would be 174m
00:16 rue_house so I havn't solved my problem, but I havn't found myself where I started yet
00:17 rue_house yea
00:17 rue_house dont get me wrong, wolfram solved everything else too
00:17 rue_house http://www.wolframalpha.com/input/?i=the+meaning+to+life%2C+the+universe%2C+and+everything
00:17 rue_house it even got that right
00:20 katsmeow-afk ask it about : MA347612890GT4078579132R74 malumalu Z17924398TZR two thousand modular guidance type 452963752391MQTO gold launch system GLS installed self deciding type double 0 three seven 293165734285YGNKTIO1200YMCA4126PPPKG53 Normad
00:21 rue_house it dosn't understand
00:21 katsmeow-afk can't, the entry line is too short
00:21 katsmeow-afk well, Tiggr knows
00:22 katsmeow-afk Normad= [!what][!who][!what] (short form: Normad) is a character that appears in the Galaxy Angel anime. Normad is an artificial intelligence placed within a pink stuffed tanuki (a plushie) in the anime series.
00:22 katsmeow-afk Normad= [!what][!who][!what] It was eventually revealed that Normad was created to destroy a sentient giant die in space named Kyutaro. This mysterious entity is capable of reading human minds, causing it to become immune to direct attacks by humans.
00:22 katsmeow-afk Normad= [!what][!who][!what] As it cannot sense non-human minds (i.e. artificial intelligence), Normad's mission was to pilot a missile into Kyutaro. Normad/Nomad is likely a reference to an The Changeling Star Trek episode of the original Star Trek TV series. In this episode the NCC-1701 Enterprise encounters a sentient weapon in space named Nomad. Both robots have very high pitched voices.
00:23 rue_house wolfram says, with 4 fets, 1.1k the turnoff time (down to 2V) is 2.6x10^-6 seconds
00:23 rue_house 2.6us?
00:24 rue_house I think the magnetic ammeter will absorb the pulse
00:43 rue_house if I use 4, do I need balancing resistors?
00:44 katsmeow-afk no
00:44 katsmeow-afk with bipolars, yeas
00:50 rue_house thats what I recalled
01:15 katsmeow-afk once you recalc'd the rx to turnthe fets off, you need to recalc all the resistors under that one, and the 2n2222
01:15 tsmeow-afk wavesgn
01:20 rue_house its ok
01:21 rue_house its ok, the 1.1k turns off the fet in 2.6us
03:51 katsmeow-afk rue: 6" stovepipe T , inverted, 2ft tall, small twigs and branches in one side of the T, air (and damper) into the other side, push twigs in so they are more than 1/2 thru the T section, adjust air accordingly, major heat comes up the top, small wood burns furiously, needs pushing in often
03:53 katsmeow-afk but maybe a rice or corn kernal pourer on a perf grate across the T will work too, you can pour it in the tall str8 portion and let air in both ends of the T at the bottom
03:58 katsmeow-afk i wish i couldsleep at nite
04:29 katsmeow-afk Of course the solution is simple: add manure.
04:29 katsmeow-afk Rodale states in The Complete Book of Composting that the average gardener may have difficulty in obtaining manure for the compost heap, but with "a little ingenuity and a thorough search", it can be found.
04:29 katsmeow-afk Where can you get manure? From an animal.
04:29 katsmeow-afk Where can you find an animal? Look in a mirror.
05:32 katsmeow-afk do you under stay end ?
05:32 katsmeow-afk do i what?
09:27 rue_house hmm, the pn2222 is peaking 82mW
09:28 rue_house rated 1.5W
09:28 rue_house 200c/w
09:29 rue_house +16c
09:29 rue_house that sounds ok
09:39 rue_house oops, base supply is too low
09:39 rue_house for the 2222
09:40 rue_house gonna change Re to 330R
09:42 rue_house De at 0.7V, Re (@10ma) at 3.3V, BE2222 at .7V pullup at .2V =
09:42 rue_house 4.9V
09:42 rue_house have 5V
09:43 rue_house I think d4 and d5 should be shottkey would help
09:46 rue_house I put the diode on the emitter so that the op-amps could definitly cut off the current
09:46 rue_house to the base
13:01 Tom_itx ok let's try 32 bit next
20:26 Tom_itx 32bit fixed my problems
20:27 Tom_itx good to have friends in the PC business
20:27 Tom_itx all my software is installing now
20:33 rue_house I wonder what intel did with 64 that broke everything so badly
20:37 rue_house katsmeow-afk, I'm gonna try that circuit at about 7pm when I wake up
20:39 katsmeow-afk k
20:42 Tom_itx i was able to use the same key
20:43 rue_house I'm sure the people are comming to get you
20:43 Tom_itx and my bud gave me the 32bit cd
20:43 Tom_itx no
20:43 Tom_itx the same key works for both
20:44 katsmeow-afk i used the same key on one puter, even after changing c:\ , both were winxp 32
20:51 Tom_itx i've got 2 xp keys but have installed multiple hdds with it
22:54 katsmeow-afk Thorne would provide pages of deeply sourced theoretical equations to the artists, who then wrote new CGI rendering software based on these equations to create accurate computer simulations of the gravitational lensing caused by these phenomena.
22:54 katsmeow-afk Some individual frames took up to 100 hours to render, and resulted in 800 terabytes of data. The resulting visual effect provided Thorne with new insight into the effects of gravitational lensing and accretion disks surrounding black holes, and will lead to the creation of two scientific papers, one for the astrophysics community and one for the computer graphics community.
23:40 rue_shop3 that circuit wont work, its gain is 125
23:40 rue_shop3 I need a circuit with a gain around 8
23:40 rue_shop3 I'm not good at analog fet amps
23:41 katsmeow-afk ?
23:43 rue_house analog has never been kind to me
23:43 rue_house how does a self biased fet amp go?
23:43 rue_house (dc coupled)
23:43 tsmeow-afk is not a fet pe
23:44 rue_house what if it were a tube
23:44 rue_house tubes do self biased amplifiers dont they?
23:44 katsmeow-afk cathode resistor
23:45 rue_house right so cathode is the drain
23:45 rue_house tubes gain is transconductance right?
23:45 katsmeow-afk but your "cathode resistor" will be passing 5 amps
23:45 rue_house sure
23:45 rue_house how do you self bias the grid?
23:46 katsmeow-afk the 5 amps causes voltage drop, in this case the cathode goes up above gnd, which makes gnd look negative
23:46 rue_house I can take 2V loss on the cathode
23:46 rue_house at 5A
23:46 katsmeow-afk theny ou bias the grid from gnd
23:49 e_house uses 1V
23:49 rue_house 0.2R
23:51 rue_house I think a tube is like an N channel fet isn't it?
23:51 rue_house with a mean transconductance
23:52 katsmeow-afk my brain has been off all day
23:53 rue_house can you pencil out a tube amp that goes from rail to rail with a 0-(lets say 4V) input?
23:53 katsmeow-afk n
23:53 katsmeow-afk o
23:54 katsmeow-afk see? i could 't even spell "no"
23:55 rue_house maybe I should do with witha tiny bipolar and use a fet voltage follower
23:56 rue_house http://www.geofex.com/Article_Folders/mosfet_folly/mosfol1.gif
23:57 rue_house no figure, its a N channel