#robotics Logs
Jan 20 2020
#robotics Calendar
01:42 AM rue_bed: https://www.aliexpress.com/item/32854130373.html
01:48 AM rue_bed: https://www.aliexpress.com/item/32740326927.html
01:48 AM rue_bed: https://www.aliexpress.com/item/1984668557.html
01:48 AM rue_bed: https://www.aliexpress.com/item/4000096081979.html
01:48 AM rue_bed: https://www.aliexpress.com/item/32821835744.html
01:48 AM rue_bed: https://www.aliexpress.com/item/32919536927.html
01:48 AM rue_bed: https://www.aliexpress.com/item/32905070447.html
01:48 AM rue_bed: https://www.aliexpress.com/item/32896741176.html
01:48 AM rue_bed: https://www.aliexpress.com/item/32956578893.html
01:48 AM rue_bed: https://www.aliexpress.com/item/32834345389.html
01:48 AM rue_bed: https://www.aliexpress.com/item/4000202383768.html
10:07 AM flyback: B
10:07 AM flyback: M
10:07 AM flyback: C
10:07 AM flyback: C
10:07 AM flyback: how you been rue_bed ?
10:08 AM flyback: eeblog was doing a thing on alix etc the other day
10:08 AM flyback: he said it's ccool as long as you qualify your parts first
10:08 AM flyback: before you switch to a cheaper brand
10:08 AM flyback: he also thought those 3 cent mcu's were neat
02:41 PM Tom_shop is now known as Tom_L
07:44 PM rue_mohr: 11 tabs, and dowwwwnnnnnn...iiiiitttttt gooooeessssssss
07:45 PM rue_mohr: flyback, whats funny about them, is that their 8051
07:45 PM rue_mohr: it'll never die
07:46 PM flyback: yep
07:46 PM flyback: just bought some jap made cap tuners
07:46 PM flyback: to make some crystal radios
07:47 PM rue_mohr: https://www.aliexpress.com/item/32956578893.html
07:47 PM rue_mohr: ^^look at that
07:47 PM rue_mohr: $3 for a 1800VA UPS
07:48 PM rue_mohr: trooo sine.
07:49 PM rue_mohr: fpga to run it? how about $11
07:51 PM flyback: nice
07:51 PM flyback: that's a igbt module
07:52 PM flyback: you need a lot more to make a ups
07:52 PM rue_mohr: yea dude, a 600V, 15A ONE
07:52 PM rue_mohr: 6 IGBT IN THAT BABY
07:52 PM flyback: oh you are fixing a unit
07:53 PM rue_mohr: NO MAN, NO. I'M BUILDING A ******** FUTURE MAN
07:53 PM flyback: oh
07:53 PM flyback: have fun
07:53 PM rue_mohr: A ********** BRIGHT ONE
07:53 PM flyback: I just fixed a ups
07:53 PM flyback: free capacitor
07:53 PM flyback: this old 2003 back-ups has 2x switch time as modern ones
07:53 PM rue_mohr: DRIVERS? YOU WANT TO TALK ABOUT DRIVERS?
07:53 PM flyback: so it doesn't flip out on apfc psu's
07:53 PM rue_mohr: WE GOT DRIVERS
07:53 PM rue_mohr: https://www.aliexpress.com/item/32854130373.html
07:53 PM rue_mohr: BAM
07:53 PM flyback: for the other machine I might swap the psu to a non pfc one
07:54 PM rue_mohr: LETS TALK $20 FOR _50_ MAN
07:54 PM flyback: have to convert +5vsb to 3.3
07:54 PM rue_mohr: 50 DRIVERS
07:54 PM flyback: and swap a pin
07:54 PM flyback: nice
07:54 PM flyback: I know about alixexpress banggoood etc
07:54 PM rue_mohr: those are 600V drivers man!
07:54 PM rue_mohr: maybe you want something smaller
07:54 PM rue_mohr: smaller eh? they do smaller!
07:55 PM rue_mohr: https://www.aliexpress.com/item/32740326927.html
07:55 PM rue_mohr: WHAM
07:55 PM flyback: what I need is germanium trannies and germanium diodes
07:55 PM rue_mohr: THAT IS SMALLER
07:55 PM flyback: making a double crystal radio
07:55 PM flyback: first one powers the tranny to boost the 2nd
07:55 PM rue_mohr: thats the 2N*****ing 60 man!
07:55 PM flyback: has to be a low power one dude
07:55 PM flyback: power germ are useless
07:56 PM rue_mohr: how many volts you ask?
07:56 PM rue_mohr: how many
07:56 PM rue_mohr: SIX HUNDRED
07:56 PM flyback: < 1v
07:56 PM flyback: likely for a crusyal radio
07:56 PM rue_mohr: THATS RIGHT
07:56 PM flyback: so BMCC
07:56 PM rue_mohr: SIX HUNDRED VOLTS
07:56 PM rue_mohr: THATS .6 KILLOVOLTS MAN
07:56 PM rue_mohr: at _TWO_ AMPS
07:57 PM rue_mohr: ok ok
07:57 PM rue_mohr: but lets say your into bipolars
07:58 PM rue_mohr: WHAM!
07:58 PM rue_mohr: https://www.aliexpress.com/item/1984668557.html
07:58 PM rue_mohr: we got 'em
07:58 PM rue_mohr: 20pcs for LESS THAN $2 MAN
07:58 PM rue_mohr: "oh but whats a 2SC2655?" you ask, eh?
07:59 PM rue_mohr: ITS EPITAXIAL
07:59 PM rue_mohr: ____AND THATS ALL YOU NEED TO KNOW____
07:59 PM rue_mohr: CAUSE EPITAXIAL RULES MAN!!!
07:59 PM rue_mohr: EPITAXIAL RULES MAN!!!
07:59 PM rue_mohr: EPITAXIAL RULES!!!
08:00 PM rue_mohr: vsat on that little sucker is 0.5VOLTS MAN
08:00 PM rue_mohr: ZERO-POINT-FIVE
08:00 PM rue_mohr: were talking 1A
08:00 PM rue_mohr: _1A_!!!!!!
08:01 PM rue_mohr: were talking like $2 for 20pcs man!!!!
08:01 PM rue_mohr: cmon, think bridge drivers
08:01 PM rue_mohr: think audio amps
08:02 PM rue_mohr: unchain your imagination man
08:02 PM rue_mohr: let that damn imagination run free man
08:02 PM rue_mohr: LET-IT-RUN-FREE
08:02 PM rue_mohr: flyback, fly! are you with me???
08:02 PM rue_mohr: CAN YOU HEAR THE WORDS I'M SAYIN MAN
08:02 PM flyback: you are as crazy as ever
08:02 PM flyback: skitzo_nuck
08:03 PM rue_mohr: oh you want motor drivers
08:03 PM rue_mohr: https://www.aliexpress.com/item/4000096081979.html
08:03 PM rue_mohr: WHAM!!!
08:03 PM * Tom_L zaps it with a lightening bolt
08:03 PM rue_mohr: motor drivers,
08:03 PM rue_mohr: were talking 10A continious man, up to 36 freaking-volts
08:03 PM rue_mohr: THOSE AREN'T NORMAL VOLTS
08:03 PM rue_mohr: THOSE ARE FREAKING VOLTS
08:04 PM rue_mohr: look at that deisgn, what does it say to you
08:04 PM rue_mohr: FLYBACK WHAT DOES IT SAY MAN
08:04 PM rue_mohr: TELL ME WHAT IT SAYS TO YOU
08:04 PM rue_mohr: ARE YOU HERE
08:04 PM rue_mohr: IS YOUR DAMN IMAGINATION RUNNING DUDE
08:04 PM rue_mohr: TURN IT ON
08:04 PM rue_mohr: CMON
08:04 PM rue_mohr: LET IT RUN FREE
08:04 PM rue_mohr: LOOK AT THIS MOTOR DRIVER
08:05 PM rue_mohr: ITS ___TWO___CHANNEL
08:05 PM rue_mohr: THINK OF ALL THE ******* ___YOU___ CAN DO WITH THAT DAMN 2 CHANNEL MOTOR DRIVER
08:05 PM rue_mohr: FLYBACK!
08:05 PM rue_mohr: FLYBACK!!!!!!
08:05 PM rue_mohr: BUY THE DAMN THING
08:05 PM rue_mohr: BUY IT NOW!
08:05 PM flyback: mabye in the near future
08:06 PM flyback: the next year is only the recovery project
08:06 PM rue_mohr: OK forget it
08:06 PM flyback: and mabhye a crystal radio
08:06 PM rue_mohr: look at these transistors man
08:06 PM rue_mohr: check this ****** out
08:06 PM rue_mohr: https://www.aliexpress.com/item/32905070447.html
08:06 PM rue_mohr: see those?
08:06 PM flyback: I have befoe
08:06 PM rue_mohr: seeeee those?
08:06 PM rue_mohr: well look at this
08:06 PM rue_mohr: https://www.aliexpress.com/item/32834345389.html
08:06 PM flyback: my late friend jfk911/j9 referenced it a lot
08:06 PM flyback: before he offed himself
08:06 PM rue_mohr: see IT JUST GETS BETTER
08:07 PM rue_mohr: https://www.aliexpress.com/item/4000202383768.html <--- see those!!!!
08:07 PM flyback: assuming they are'nt fake
08:07 PM flyback: yes
08:07 PM rue_mohr: YOU NEED THOSE
08:07 PM rue_mohr: THOSE ARE DAMN TRANSISTORS
08:07 PM flyback: I know
08:07 PM rue_mohr: THATS BETTER THAN A NORMAL ONE
08:07 PM rue_mohr: ITS A _DAMN_ TRANSISTOR
08:07 PM flyback: I know this dude
08:07 PM rue_mohr: THEN SAY IT LOUDER
08:08 PM flyback: I also know I have 0 space to build anything at my folks house
08:08 PM rue_mohr: SAY YOU KNOW IT
08:08 PM flyback: so for now .
08:08 PM rue_mohr: SAY IT NOW
08:08 PM rue_mohr: SAY IT LOUD
08:08 PM flyback: BMCC
08:08 PM flyback: BMCC
08:08 PM rue_mohr: WITH ME MAN
08:08 PM flyback: BMCC
08:08 PM flyback: you know it
08:08 PM rue_mohr: TELL ME
08:08 PM rue_mohr: TELL ME THE ONE YOU WANT TO BE BURRIED WITH
08:08 PM rue_mohr: HOW MANY AMPS DUDE
08:08 PM rue_mohr: HOW MANY AMPS?????
08:08 PM flyback: the recovery project is what I want to be buried with
08:08 PM flyback: and that might come soon
08:09 PM flyback: if I shit any more blood
08:09 PM flyback: :P
08:09 PM * Tom_L feels rue_mohr just may have gone off the deep end
08:09 PM rue_mohr: oo, ya know, I need to go check the mail box, biab
08:10 PM flyback: boozernuck
08:14 PM rue_mohr: think I should use those motor drivers for my cnc and jack the fets on them to get the 30V/20A drivers I need?
08:14 PM rue_mohr: they didn't even heatsink them
08:14 PM rue_mohr: I think they can take 20A
08:17 PM rue_mohr: dunno tho, I got series wound motors that are gonna be a pain
08:17 PM flyback: gay
08:17 PM flyback: why
08:17 PM flyback: series wound are crap
08:21 PM flyback: starter motors used to be like that
08:21 PM flyback: which is why you could only crank for 30s
08:22 PM flyback: they are high power cunts with 0 runtime due to low efficiency
08:23 PM flyback: also communitators suck
09:23 PM rue_mohr: cause its a 1HP that weights like 5lbs
09:36 PM flyback: and can run for 30s
09:38 PM mrdata__ is now known as mrdata-
09:53 PM rue_mohr: if I have a first order filter
09:53 PM rue_mohr: thats -62db @20khz
09:53 PM rue_mohr: whats its -3b freq?
09:56 PM rue_mohr: about 0.02Hz
09:56 PM rue_mohr: hmm
09:57 PM rue_mohr: oh wait
09:57 PM mrdata-: high pass? low pass? band pass?
09:57 PM mrdata-: band stop?
09:57 PM rue_mohr: low pass
09:57 PM rue_mohr: so -20db/decade on first order
09:58 PM rue_mohr: but -40db/decade on second order
09:58 PM rue_mohr: so a second order sounds good
09:58 PM mrdata-: good for what application?
09:58 PM rue_mohr: audio
09:58 PM rue_mohr: so, its oversampled 1 bit audio
09:59 PM rue_mohr: my target is to get about 8bit quality out of it
09:59 PM rue_mohr: with 5V levels, 8bit is 3.9mv
09:59 PM rue_mohr: aka -62db
10:00 PM rue_mohr: so, if I want that to be at 20kHz
10:00 PM rue_mohr: 2khz puts me at -22db
10:01 PM rue_mohr: I think it would be around 1.2khz
10:06 PM mrdata-: but for audio, dont you want the -3dB cutoff to be 20 kHz?
10:06 PM mrdata-: or is this a power line filter
10:07 PM rue_mohr: I have 0db noise going in
10:07 PM mrdata-: hang on
10:07 PM rue_mohr: I want -62db comming out
10:07 PM rue_mohr: I'm doing it backwards
10:07 PM rue_mohr: cause its a 5V stream that I'm filtering down
10:08 PM mrdata-: dB is a relative scale not an absolute one. when you relate it to an absolute, you use something like dBm or dBW
10:08 PM rue_mohr: 5Vp-p is the 0db
10:08 PM rue_mohr: I want the output to be 3.9mv
10:08 PM rue_mohr: aka -62db
10:11 PM mrdata-: something isnt right
10:12 PM mrdata-: oh, my mistake
10:12 PM mrdata-: yes, -62.15 dB
10:17 PM rue_mohr: second order, Fc is about 530Hz
10:20 PM rue_mohr: so then I just need to know if I did that design right
10:21 PM mrdata-: in audio, usually you want the pass band as flat as possible
10:21 PM rue_mohr: sure, but this is like a pwm filter
10:21 PM rue_mohr: less its not pwm
10:21 PM mrdata-: butterworth filters are nice for that
10:22 PM rue_mohr: I'm trying to work out the freq for my oversampling
10:22 PM rue_mohr: for the 1bit
10:22 PM rue_mohr: to get equiv 8 bit
10:23 PM mrdata-: what output impedance do you want
10:23 PM rue_mohr: 1k is ok
10:23 PM rue_mohr: hahah
10:23 PM rue_mohr: you know what I mean
10:24 PM mrdata-: this is my go to calculator for filter design, http://www.wa4dsy.net/filter/filterdesign.html
10:30 PM Tom_L: 102 = 1k?
10:32 PM mrdata-: Tom_L: yes
10:33 PM mrdata-: in resistors
10:33 PM mrdata-: in caps it's 1 nF
10:35 PM Tom_L: well at least all these IO have resistors on the breakout
10:36 PM Tom_L: err maybe that's just for the P-Mod plugs