#garfield Logs
Jul 12 2020
#garfield Calendar
12:44 AM jymmmm: rue_shop1: ...and 24v interters need 18V on the low side
01:03 AM zhanx: Jymmm fyi just realized. That last pic. Hot gas bypass cycle
01:05 AM zhanx: Jymmmm even
01:07 AM jymmmm: zhanx: the PTC you mean?
01:08 AM zhanx: Was that the result ?
01:08 AM jymmmm: zhanx: Of?
01:09 AM zhanx: After thinking of it i figured it would reverse cycle to defrost the condenser
01:09 AM jymmmm: isn't that what the reverse valve is for?
01:09 AM jymmmm: reversing*
01:10 AM zhanx: Depends on the unit
01:11 AM jymmmm: By the copyright date, circa 1982
01:11 AM zhanx: 82. K so maybe . Maybe
01:13 AM jymmmm: Carrier 50yq036300 - 2.5Ton single package heat pump
01:20 AM jymmmm: zhanx: The PTC (Start thermister) is wired in parallel with the compressor capacitor
01:26 AM jymmmm: zhanx: "Start thermistors are used to provide additional starting torque for PSC compressors. The start thermistor is a temperature sensitive device whose electrical resistance changes as a result o f a change in temperature. Positive temperature coefficient (PTC) thermistors increase their resistance with an increase in temperature. PTC thermistors are commonly used in the start circuit of PSC compressor motors." http://www.hva
01:26 AM jymmmm: cspecialists.info/service/start-thermistors.html
01:58 AM rue_mohr: arg, its only 11:48 and I'm getting tired
01:58 AM rue_mohr: how you doing polprog
01:58 AM rue_mohr: must be up by now
02:04 AM rue_mohr: ECHO
02:04 AM rue_mohr: hmm dont want to eat
02:04 AM rue_mohr: do want more tea
03:55 AM rue_bed: k, I'd like to get the gearbox togethor tommorow
03:55 AM rue_bed: and strip down some harddrives
03:55 AM rue_bed: and try the next rev of that pwm gen
09:05 AM jymmmm: good morning
11:14 AM polprog: hey rue, im back home
11:14 AM rue_mohr: k
11:14 AM polprog: was at the summer house
11:14 AM rue_mohr: ah
11:14 AM polprog: now ill just go to the polling station and start catching up
11:14 AM rue_mohr: ;)
11:14 AM polprog: i see you have some eprom hooked up :)
11:15 AM Tom_L: morning
11:15 AM polprog: bbl
11:20 AM rue_mohr: https://twitter.com/dave1stapley/status/1282267534725713921
11:21 AM rue_mohr: there is a project eh?
11:47 AM polprog: back
11:48 AM polprog: rue_mohr: so whats up?
11:48 AM rue_mohr: you said that before
11:48 AM rue_mohr: I'm just waking up
11:48 AM polprog: yes ,but im back from a different place now :)
11:49 AM rue_mohr: <rue_bed> k, I'd like to get the gearbox togethor tommorow
11:49 AM rue_mohr: <rue_bed> and strip down some harddrives
11:49 AM rue_mohr: <rue_bed> and try the next rev of that pwm gen
11:49 AM rue_mohr: todo list helps
11:51 AM polprog: thats quite a project that robot
11:51 AM rue_mohr: https://www.fpga4fun.com/PWM_DAC_2.html
11:51 AM rue_mohr: overflow??? seriously???
11:52 AM polprog: http://www.dimdim.gr/diyaudio/soekris-dam1021-sign-magnitude-r-2r-dac/
11:52 AM polprog: thats a dac..
11:53 AM rue_mohr: yup
11:53 AM rue_mohr: but ..
11:53 AM rue_mohr: http://ruemohr.org/~ircjunk/tutorials/elex/1bitanalog/slide.htm
11:53 AM rue_mohr: thats the hardware ver
11:53 AM rue_mohr: I cant see how they equate
11:55 AM polprog: what are the chips there?
11:55 AM rue_mohr: LM393, high speed comparitor
11:56 AM rue_mohr: 74ls74, flipflop
11:56 AM rue_mohr: and 74LS244, buffer/driver
11:56 AM polprog: oh
11:56 AM rue_mohr: http://ruemohr.org/~ircjunk/tutorials/elex/1bitanalog/p1080670.jpg
11:56 AM polprog: i should build one
11:56 AM rue_mohr: "393" "'74" "'244" :)
11:56 AM Tom_L: that's an awfully squiggly trace
11:57 AM rue_mohr: its cool cause it has its own filter that it uses to model the filter you use on the recovery end
11:57 AM polprog: neat
11:57 AM rue_mohr: and it just adjusts its output to make its version as close to the signal as possible
11:57 AM rue_mohr: as the output filter is the same, it comes out the same
11:57 AM rue_mohr: thats what CDs use for audio
11:57 AM polprog: yeah
11:58 AM rue_mohr: "1 bit DAC"
11:58 AM rue_mohr: I wrote the RC libary
11:58 AM rue_mohr: :)
11:58 AM rue_mohr: I wrote the RC libary so that I could generate bitsteams to play back off roms and things
11:58 AM rue_mohr: as the output of the RC filter is accurate
11:59 AM rue_mohr: if you dont have the right RC, you just get a smaller signal
11:59 AM rue_mohr: its better than pwm
12:00 PM rue_mohr: oh damnit, I have my land tax here!
12:00 PM rue_mohr: how long that been sitting on my desk!!!
12:00 PM rue_mohr: arg
12:14 PM polprog: hmm, the ICs and rasterboards should be on monday...
12:16 PM polprog: meanwhile now what should i do
12:22 PM rue_mohr: recode your audio clip in 1 bit audio using your capacitor library to simulate the ADC circuit
12:24 PM rue_mohr: at 1 bit ea you can store 8 clips on the rom
12:24 PM polprog: hmm
12:24 PM polprog: but they would be 8x shorter
12:25 PM rue_mohr: +- the oversampling required for 1 bit
12:25 PM polprog: yeah
12:25 PM Tom_L: taking requests??
12:25 PM polprog: nah, i guess ill clean up the bed
12:26 PM polprog: would be nice to sleep in it instead of the living room
12:26 PM rue_mohr: its sunny I have to do outside things
12:26 PM polprog: ^
12:26 PM rue_mohr: Tom_L, what are ya thinking
12:26 PM rue_mohr: its 10:17 I need breakfast
12:27 PM rue_mohr: <rue_mohr> <rue_bed> k, I'd like to get the gearbox togethor tommorow
12:27 PM rue_mohr: <rue_mohr> <rue_bed> and strip down some harddrives
12:27 PM rue_mohr: <rue_mohr> <rue_bed> and try the next rev of that pwm gen
12:27 PM rue_mohr: hmmm
12:28 PM rue_mohr: what were the outside things...
12:28 PM rue_mohr: lawn needs a mow, I should set the mower loose
12:28 PM Tom_L: get larry & curly to mow
12:29 PM rue_mohr: heh
12:29 PM rue_mohr: I havent finished building curly
12:36 PM Tom_L: i should trim some tree branches but i'm gonna wait a week or so
01:13 PM rue_mohr: for them to get bigger? :)
01:13 PM rue_mohr: the mowerbot battery is shot
01:14 PM rue_mohr: *again*
01:14 PM polprog: ok, i guess ill just keep testing the push pull pairs
01:15 PM polprog: i tested 337/327.. so far
01:16 PM rue_mohr: for the cap tester?
01:16 PM polprog: no, for general jellybean stuff
01:16 PM polprog: but hey
01:16 PM polprog: CAP TESTER!
01:29 PM rue_mohr: ok,
01:33 PM polprog: let me rebuild it with a different 50% DC dource
01:43 PM polprog: source even
02:16 PM polprog: looks like it wirks fine
02:22 PM polprog: however im getting different shapes
02:26 PM polprog: https://polprog.net/rozne1/ircjunk/various/captest2_1R.png
02:26 PM polprog: caps in the divider are 22uF
02:27 PM Tom_L: what are you feeding them?
02:27 PM polprog: 2k square wave, from a push-pull, via a 330R resistor
02:55 PM rue_mohr: ah lets see
02:55 PM rue_mohr: show me across a 1R resistor
02:56 PM rue_mohr: a resistor is all ESR, so you should see a square wave
03:04 PM polprog: yeah, thats weird
03:04 PM polprog: that image is across 1 ohm
03:07 PM rue_mohr: your building just like I showed right? no changes less the transistor model?
03:08 PM polprog: my pushpull stage is different
03:08 PM polprog: let me draw it
03:09 PM polprog: actually let me just build it like you did
03:10 PM polprog: ugh
03:10 PM polprog: the other power rail pair was not connected
03:10 PM rue_mohr: kinda wondered
03:14 PM polprog: it is now
03:14 PM rue_mohr: <rue_mohr> <rue_mohr> <rue_bed> k, I'd like to get the gearbox togethor tommorow
03:14 PM rue_mohr: <rue_mohr> <rue_mohr> <rue_bed> and strip down some harddrives
03:14 PM rue_mohr: <rue_mohr> <rue_mohr> <rue_bed> and try the next rev of that pwm gen
03:14 PM rue_mohr: darn it, all the things I'v done today aren't those things
03:14 PM polprog: how much of today is left?
03:15 PM rue_mohr: less than half
03:15 PM polprog: oops
03:15 PM polprog: 1R = 31.3mVpp
03:15 PM polprog: test cap 1 15mV
03:16 PM polprog: supercap 2.06V (!), DC ofset (!!)
03:17 PM rue_shop1: yea. supercaps have really high ESR
03:17 PM jymmmm: hardvesting magnets?
03:17 PM rue_shop1: just stripping down
03:18 PM polprog: test cap 2, 150mV
03:18 PM polprog: okay
03:18 PM polprog: wait, no
03:18 PM polprog: shift, not vpp
03:18 PM jymmmm: I have a stack of plattens, and still no idea what to do with them
03:18 PM polprog: still, test cap 2 has noticeable
03:18 PM polprog: good
03:18 PM polprog: this is buildable then
03:18 PM polprog: just need to get the rasterpboards
03:19 PM polprog: im gonna make myself some supper
03:19 PM jymmmm: Anyone want 38F caps 2.7V ?
03:19 PM polprog: heh
03:19 PM polprog: where you at?
03:19 PM jymmmm: https://www.batteryclearinghouse.com/products/38f-super-capacitors-2-7v-set-of-30
03:21 PM polprog: huh
03:21 PM polprog: why does it have sata
03:21 PM polprog: argh
03:21 PM polprog: hungry
03:22 PM rue_shop1: polprog, good good
03:22 PM jymmmm: to power the server
03:23 PM jymmmm: you get 30 for $16
03:24 PM jymmmm: 1140 Farad :D
03:49 PM polprog: lol
03:50 PM polprog: rue_shop1: ^_^
03:52 PM polprog: good. i have some banana plugs here, ill make it a box maybe
03:52 PM * polprog looks at the piles of books and junk on the bed
03:57 PM * jymmmm hands polprog a match
03:58 PM jymmmm: ...and marshmellows
03:58 PM rue_shop1: just remember that you need to keep the resistance down
03:58 PM rue_shop1: even 0.5 ohms shows clearly
03:59 PM jymmmm: rue_shop1: 16.8V inverter???
03:59 PM polprog: rue_shop1: ill keep that in mind
04:02 PM rue_mohr: 16.8?
04:04 PM jymmmm: rue_mohr: I'm making a 4S LiPo battery, but cna't find an inverter that accepts 16.8V
04:04 PM rue_mohr: oh
04:05 PM rue_mohr: for 120v?
04:05 PM jymmmm: yeah
04:05 PM rue_mohr: I wonder why not, up to 35 or so should be all the same
04:05 PM jymmmm: Most have a 15V overvoltage cutoff
04:05 PM rue_mohr: huh
04:06 PM rue_mohr: I guess they aren't doing any kinda regulation
04:07 PM jymmmm: well I found one, but don't need 1000 to 6000W
04:07 PM jymmmm: rue_mohr: Sine you made your inverter, I was wondering if you had any ideas?
04:08 PM rue_mohr: its not done yet
04:08 PM Tom_L: considering a rotary axis
04:09 PM jymmmm: thats okey, but you get the general drift, what kills me is it's only 1.8V, lol
04:09 PM rue_mohr: but I'm going to take and make a (probably flyback) +-168V dc-dc (regulated) then pwm modulate that
04:09 PM rue_mohr: yea, I only need 100w (well 70w) so yea
04:10 PM rue_mohr: Tom_L, I just dont know if I have a gen to do that
04:10 PM rue_mohr: dont think I have anything with the right rings/field
04:10 PM rue_mohr: yea need sliprings
04:10 PM rue_mohr: but the solid state one was already a project
04:10 PM rue_mohr: so technically, I havn't taken on a new project
04:10 PM rue_mohr: just picked up an old oe
04:13 PM Tom_L: i don't
04:13 PM Tom_L: but it could be used as an indexer
04:13 PM Tom_L: i dunno
04:13 PM Tom_L: just a flying thought
04:15 PM polprog: flyback +168V?
04:16 PM polprog: interesting
04:16 PM polprog: what is your target load/power? Just lights?
04:22 PM rue_mohr: yea
04:23 PM rue_mohr: 100w
04:23 PM rue_mohr: so the 168V supply only needs to supply like 600mA
04:30 PM polprog: oh, right
04:31 PM polprog: you could probably make it dimmable then ;)
04:47 PM rue_shop1: the lamps dont do dimming :)
04:56 PM Tom_L: if they got rueified they might
05:03 PM rue_mohr: I dont want dimmable
05:04 PM Tom_L: me either in the shop
05:05 PM Tom_L: only ones are in the kitchen but they're not strips
05:49 PM zhanx: Looks like my connection is more stable now
05:49 PM zhanx: I was out magnet fishing
06:21 PM Tom_L: rue_mohr, i've got a couple 'indexer' post files but i don't understand them
06:21 PM Tom_L: for FADAL control
06:46 PM jymmmm: zhanx_: It's running atm =)
08:03 PM rue_mohr: indexer?
08:05 PM Tom_L: my cad cam is supposed to support indexers but not full rotary
08:06 PM Tom_L: i've never taken time to figure it out
08:07 PM Tom_L: linuxcnc however does support full rotary
08:11 PM rue_mohr: ah
08:12 PM rue_mohr: I'v never used my rotary axis
08:13 PM Tom_L: i don't have a need for it right now
08:13 PM jymmmm: Tom_L: yes you do
08:25 PM rue_mohr: <rue_mohr> <rue_mohr> <rue_mohr> <rue_bed> k, I'd like to get the gearbox togethor tommorow
08:25 PM rue_mohr: <rue_mohr> <rue_mohr> <rue_mohr> <rue_bed> and strip down some harddrives
08:25 PM rue_mohr: <rue_mohr> <rue_mohr> <rue_mohr> <rue_bed> and try the next rev of that pwm gen
08:25 PM rue_mohr: gearbox is kinda togethor
08:25 PM rue_mohr: the new rev of the pwm circuit works
08:26 PM rue_mohr: https://youtu.be/l259lokcCGI
08:47 PM rue_mohr: ok, well if I take some drives apart I guess I'm good
08:47 PM rue_mohr: need to hilight my long term goal projects
08:47 PM rue_mohr: try to stay on focus
08:48 PM Tom_L: meh
10:03 PM rue_mohr: ok well I stripped down 20 hard drives
10:03 PM rue_mohr: there must be 100 more on that pile
10:06 PM jymmmm: rue_mohr: plug them in and see if they work =)
10:09 PM rue_mohr: cant
10:09 PM rue_mohr: their fiber channel
10:09 PM jymmmm: ah
10:09 PM rue_mohr: and their liscence locked
10:09 PM rue_mohr: but their like 37G
10:10 PM rue_mohr: I got a few 500G sata from the collection
10:10 PM rue_mohr: they had adapters
10:11 PM rue_mohr: I should try to melt some down this week
10:11 PM rue_mohr: kinda have a lot of aluminum
10:11 PM jymmmm: oh you recycling the aluminum?
10:11 PM rue_mohr: melting/casting it
10:11 PM jymmmm: yeah
10:12 PM jymmmm: I just grab the mag and plattens, them toss the rest
10:12 PM rue_mohr: http://ruemohr.org/~ircjunk/projects/vacuumplate/slide.htm
10:14 PM rue_mohr: maxed out the lathe size
10:17 PM jymmmm: whats the white puck?
10:17 PM rue_mohr: a special casting thing for the pipe
10:17 PM rue_mohr: its for doing lost wax casting
10:18 PM jymmmm: ah
10:38 PM jymmmm: I have a Model M just sitting in the drawer
11:07 PM rue_mohr: .... would you sell it?
11:08 PM rue_mohr: hmm I really should just build a keybaord
11:08 PM Tom_L: my omnikeys are still going strong too
11:10 PM jymmmm: rue_mohr: IDK how much shipping would be
11:11 PM Tom_L: he'd never get it anyway. canada post would keep it
11:11 PM jymmmm: I think I still have the OFFICIAL IBM key removal tool too :)
11:16 PM Tom_L: damn, writing SD takes forever
11:22 PM jymmmm: SD card?
11:22 PM Tom_L: yes
11:29 PM jymmmm: I've just standardized on MicroSD cards
11:32 PM Tom_L: these are micro but i've got several others
11:41 PM jymmmm: ah