#garfield Logs

Sep 01 2013

00:03 tsmeow-afk h
00:10 katsmeow-afk on bigger batteris, looks like the charger gives a pulse to see if it's driving a short, and then if the voltage doesn't come up enough, it quits for a sec, then retries... a 0.1 ohm resistor cures that and it charges full on
00:39 rue_shop2 kat, I keep needing power leds, red for showing + power presence and black for showing - power prescence
00:40 katsmeow-afk and the black leds ones need negative watt resistors?
00:44 tsmeow-afk ponders the black led being so strong that when you shut the equipment off, it sucks all the light out of the
01:10 rue_shop2 ^ on
01:11 rue_shop2 goes black when power is applied, silly
01:11 rue_shop2 tho I suppose, it would generate electricity
01:11 rue_shop2 hmm
01:12 rue_shop2 there is power when the led is black because its absorbing it from the room...?
01:13 rue_shop2 applying power would make it stop absorbing the light in the room, which is turning the black led off...
02:07 katsmeow-afk light is power, so absorbing it means it hasto go somewhere
02:16 katsmeow-afk why do humans say a certain car is a "limOH", but thensay that is an abbr for "limAHzene"?
02:18 katsmeow-afk some woman was on radio today advertising something, saying she won a gold medal at the Olympics as a "gymnist", but there were no "gymnistics" at the Olympics, there is no nationa gymnistics association
02:35 rue_shop2 I thought I had 5V across this resistor but I actually have 5V+24V
02:35 rue_shop2 so 470R isn't good...
02:36 rue_shop2 whats the gain of a 2n3055 at 3A... hmmm
02:37 rue_shop2 they say between 20 and 70
02:37 rue_shop2 so if I'm driving 3A
02:37 rue_shop2 150mA
02:37 rue_shop2 ugh
02:38 rue_shop2 or best case...
02:38 rue_shop2 42mA
02:38 rue_shop2 lots of drive current
02:39 e_shop2 stares at the schematic and scratches his
04:02 rue_shop2 katsmeow-afk, DIP 74LS00 tell me if you see a ripping deal on ebay eh?
04:02 rue_shop2 I use them as signal processors to conver dir/pwm to PWM1/PWM2 signals on motor drivers
04:03 rue_shop2 I beleive I'm actually running low
04:03 rue_shop2 and I want to roll off about 10 or so more motor drivers
04:45 e_mohr taps on the glass...
07:41 tsmeow-afk taps
07:42 rue_shop2 ...---...
07:42 katsmeow-afk any 74LS is going to be hard to find, i expect, since they quit making them decades ago
07:44 katsmeow-afk the gain of the olde 2N3055 is so bad, you can drive the base at 3 amps
07:46 katsmeow-afk cheapest for qty 10 is http://www.ebay.com/itm/10-pcs-74LS00-Quad-2-Input-NAND-Gate-Texas-/170908559835
07:47 rue_shop2 $4 seems kinda high...
07:47 katsmeow-afk this is prolly the best bang for the buck, but they are soic : http://www.ebay.com/itm/100-Fairchild-DM74ALS00A-QUAD-2-INPUT-NAND-GATE-SOIC-14-SMD-SMT-74ALS00-74LS00-/221266371576
07:48 rue_shop2 need dip
07:48 katsmeow-afk it's 100 for $4
07:49 katsmeow-afk this is 20 dips for $6.59 : http://www.ebay.com/itm/20-pcs-74LS00-Quad-2-Input-NAND-Gate-Texas-/170908560063
07:49 katsmeow-afk big "value" difference
07:52 katsmeow-afk $9.49 for qty 50 74HC00 soic: http://www.ebay.com/itm/50-PCS-74HC00D-SOP-14-74HC00-SMD-Quad-2-input-NAND-gate-/290965082460
07:53 katsmeow-afk $10.00 for qty 50 74LS00 dips : http://www.ebay.com/itm/74HC00-Quad-2-Input-NAND-Gate-NOS-New-Old-Stock-QTY-50-ea-/151092179789
07:53 rue_shop2 I burn them out alot, dips are easier to change
07:53 katsmeow-afk oops
07:53 rue_shop2 10 for 50 is getting there
07:53 katsmeow-afk $10.00 for qty 50 74HC00 dips : http://www.ebay.com/itm/74HC00-Quad-2-Input-NAND-Gate-NOS-New-Old-Stock-QTY-50-ea-/151092179789
07:53 katsmeow-afk note it's HC
07:53 rue_shop2 LS seems to co-operate better for me
07:54 rue_shop2 dunno why
07:54 katsmeow-afk similar dive capability, wider output voltage swing, and 2x as fast a part
07:54 rue_shop2 dont seem to drive bipolars well
07:54 katsmeow-afk i used only LS too, when i wasn't after raw blazing speed or low power
07:55 katsmeow-afk 74F will drive bipolars real fast ;-)
07:55 rue_shop2 the 50ls is $7 + 8.60 chipping
07:55 rue_shop2 which isn't bad...
07:56 katsmeow-afk yeas, LS is gonna cost more, dips will cost more, plus you are in Canadia with no way set up around your post system up there
07:57 rue_shop2 china!
07:57 rue_shop2 gets around it every time
07:59 tsmeow-afk has 600 74F00 in
08:00 katsmeow-afk well, those are the best deals i see
08:02 katsmeow-afk if you want only 10, this is prolly fastest shipping : http://www.ebay.com/itm/10-x-74LS00-Quad-2-Input-NAND-IC-Gate-14-DIP-TEXAS-/250545684640
08:02 rue_shop2 thankyou!
08:02 katsmeow-afk free s&h from Texas
08:04 katsmeow-afk we know tadya####, i dunno this guy : http://www.ebay.com/itm/10-pcs-DM74LS00N-NSC-14-PIN-DIP-PACKAGE-QUAD-2-INPUT-NAND-GATE-74LS00N-FREE-SHIP-/121110755852
08:06 rue_shop2 funny 7.35 for free shipping
08:06 katsmeow-afk ???
08:07 katsmeow-afk no way, i can put 10 in an envelope for 60 cents to you! (but on a dip the pins will get bent)
08:09 tsmeow-afk knows Tom makes and sells tiny switcher psu modules, but i wonder if he also tweaks dc-dc convertors for micro-itx mobo to put out 14v at gobs of
08:11 rue_shop2 kat, do you have a few hundred ls00?
08:12 katsmeow-afk like http://www.mini-box.com/s.nl/sc.8/category.13/.f , or http://www.mini-itx.com/store/?c=10 , or http://www.ebay.com/itm/261275507701
08:13 katsmeow-afk i have zero 74LS00
08:13 katsmeow-afk LS tops out at 35Mhz, HC runs 2x as fast at much less power, and can be cheaper to buy when oems are dumping parts
08:14 katsmeow-afk and i was looking for deals on 74F and 74ABT first, and 74LVC/LVX/HC next,, like under $10-per-1000 cheap
08:16 katsmeow-afk kinda deals i usually do: 2500 pcs 1000ufd 16v : 99 cents , AND i shared/split the s&h on it
08:16 katsmeow-afk i grabbed over 100 pcs of a barrier strip for what Home Depot sells just ONE for, and again split/shared the s&h
08:17 rue_shop2 :)
08:18 katsmeow-afk i don't touch a solar cell now unless it's 28 cents per watt or less, which is a price people would faint for 20 yrs ago
08:18 katsmeow-afk 1080 74ACT541 for $11
08:20 rue_shop2 I use them for doing dir/pwm to pwmA/pwmB translation
08:20 katsmeow-afk last, and almost ONLY 74ls i got are almost never available inother 74 series: 100 74LS221 and 100 74LS123
08:20 katsmeow-afk why do you use nand gates for that?
08:21 rue_shop2 it works perfect
08:21 katsmeow-afk k
08:22 katsmeow-afk 1000 pcs 74LVC573 $10
08:22 katsmeow-afk 20 yrs ago, if youo could find them, they were $5 each chip
08:22 rue_shop2 http://eds.dyndns.org/~ircjunk/circuits/motordriver.png
08:23 katsmeow-afk yipes
08:23 rue_shop2 the new one I did today uses all NPN drivers, but it uses the same circuit to to the translation
08:23 rue_shop2 half bridge, split power supply
08:23 katsmeow-afk you realise that says 74Als, not 74LS ?
08:23 rue_shop2 saves 50% of the transistors
08:23 rue_shop2 thats just cause of eagle
08:24 rue_shop2 there is just one flaw I might work on later, if you power the logic, without an input signal, it defaults to 'reverse'
08:25 rue_shop2 instead of stop
08:25 rue_shop2 I suspect if I redo with 74ls02 I can fix
08:26 katsmeow-afk or just shut off the power to T2 and T3 so no B-E current can flow
08:27 rue_shop2 I been up all night, I' think I'm gonna crash
08:27 katsmeow-afk how are you getting direction control with only one motor winding?
08:27 katsmeow-afk oh,, dc motor
08:28 tsmeow-afk slaps her fore
08:28 rue_shop2 I use that design on the hexapod where there are 18 motors, saves 36 transistors and their losses, I just have to pay with a split supply
08:29 katsmeow-afk yeas
08:34 tsmeow-afk suggests Tom redesign http://www.ebay.com/itm/261275507701 to accept 14vdc to 30vdc input and deliver 14vdc even if less than 160 w
08:36 katsmeow-afk http://www.ebay.com/itm/LOT-OF-10-UNITED-PRO-UNITEDPRO-12V-DC-2-WIRE-FAN-DC6025X12B-NEW/270830555454 $18 free s&h
08:48 katsmeow-afk oh, and isolated input and outputs
08:49 katsmeow-afk so the same 24v input can charge two 12v batteries in series
08:49 katsmeow-afk whyfor? because solar panel volts can drift a *lot*
08:50 katsmeow-afk personally i'd prefer to run 170v @ 8amps in on some #14 than a 24v line @ 60amps
08:51 katsmeow-afk same watts, and both need switcher regulators at the bateries
08:56 tsmeow-afk has a *case* of Sparkle brand pc psu, which do indeed sparkle and smoke at 1/2 rated ou
08:57 katsmeow-afk rejiggered for 14v output, would have been ideal for this
17:20 katsmeow-afk the very same 14v adapters i paid $7 for a few days ago are now:
17:20 katsmeow-afk Buy it now $10.39
17:20 katsmeow-afk 20% Off normal $12.99
17:20 katsmeow-afk from the same seller
17:21 katsmeow-afk however, it is available for $7 from other sellers,,, i guess he didn't think i'd look around
17:45 katsmeow-afk 10000 PCS RECTRON 1N4002G-T-S-NT DIODE GENERAL PURPOSE AXIALThis seller accepts PayPal
17:45 katsmeow-afk 3 Bids: $10.50
17:46 katsmeow-afk yep, 10,000 1N4002 diodes
18:03 tsmeow-afk ponders putting separate wires out from the cells in the corners, to measure them, to know if there's a shadow beginning to move across the p
18:07 katsmeow-afk if i wire like (-) corner-corner-corner-corner-alltherest , i can sit an avr on (-) to measure those 4 corners
18:08 katsmeow-afk toggle some transistors and relays and things to avoid reverse biasing the panel when it's shaded?
18:09 katsmeow-afk woo, college education in usa "Figthing Irish" lmao
18:09 katsmeow-afk no one spell checked it, no one knew it was spelled "fighting", and no one stopped the distribution
18:13 katsmeow-afk http://www.lostlettermen.com/notre-dame-cups-hype-figthing-irish/
20:43 katsmeow-afk http://www.youtube.com/watch?v=QLpP3MYkfDk
20:54 katsmeow-afk a kw of solar cells for $165 + $28 s&h ?
21:33 rue_shop2 http://www.youtube.com/watch?v=-aAwyUoawkc
21:34 rue_shop2 think I can get togethor a candle and a 300V dc supply tonight?
21:34 katsmeow-afk got bee hive?
21:37 rue_shop2 ?
21:38 rue_shop2 I dont understand why a filament In a flame needs to be heated...
21:38 katsmeow-afk for candle wax
21:38 rue_shop2 ah, I think Ihave some little candles
21:38 rue_shop2 best way to have a circuit catch fire: have it on fire in the first place
21:39 rue_shop2 I'm gonna make a list of some pcb's to print and try to do them
21:39 katsmeow-afk ummm,,,, you don't think the FR4 will flame up in the fire ?
21:40 katsmeow-afk i think it hasto be a clean flame, soot may raise the resistances a lot
21:40 rue_shop2 I think fire resistant means it wont support a flame on its own
21:41 rue_shop2 its gonna be a high impedence amp anyhow
21:43 tsmeow-afk ponders a searchlite beam as an emitter, an lcd screen as the grid, and a solar cell as the plate , and no
21:45 katsmeow-afk if you manage to modulate the lcd sceen with a watt or less, the solar cells may output 15 watts, so it will still be anamilifier, and stronger than a 6V6 vac tube
22:01 rue_shop2 I think you would have to use an integrator to the lcd
22:02 rue_shop2 dosn't it make you creativly curious
22:02 rue_shop2 ?
22:02 katsmeow-afk you forget i got into electronics with vac tubes,,, i also played with heating dissimilar mentals in fire to make electricity
22:02 katsmeow-afk metals
22:05 katsmeow-afk there was a lot of experimetation in the 70's with electronics
22:10 katsmeow-afk i cannot think of the name of it, but there was a gadget you could really get burned with, it was a flame, or wall of flame, with electrodes top and bottom, and you used your hands as the grid
22:11 katsmeow-afk your hands didn't need to be charged, you could wear gloves, because the flame was supposed to be a variable resistance that your hands physically interrupted the way a tube grid makes a electron cloud to repell flow
22:12 katsmeow-afk there were a few nutso projects like that, i wish i knew how many peple set their clothes on fire with that one
22:17 katsmeow-afk rue, why not wind a coil of wire as grid, a hunk of emt as plate, put another coil in the center of fire as cathode?
22:17 katsmeow-afk instead of the single flat grid evyerone else is using?
22:19 katsmeow-afk ((+))
22:19 katsmeow-afk ( ) emt tube as plate
22:19 katsmeow-afk ( ) coil as grid
22:19 katsmeow-afk + coil in center of fire as cathode
22:25 katsmeow-afk zoom in on http://www.ebay.com/itm/Blue-Arcturus-127-27-5-Pin-Globe-Radio-Tube-2-Tests-Strong-Guaranteed-TM-/221139340383
22:26 katsmeow-afk it's a coiled filament, grid coil around it, and a cylindrical plate ,, all you do is add fire and not use a glass tube
22:37 tsmeow-afk hands rue a 12inch burner from a furnace, a short roll of stainless steel mesh, and tells rue to go find his own 12inch long p
22:37 katsmeow-afk ------------------------------- plate
22:37 katsmeow-afk ------------------------------- mesh
22:37 katsmeow-afk ------------------------------- furnace burner
22:38 katsmeow-afk i expect an avi of it playing the theme from Hatari
22:41 katsmeow-afk this also has a cylinder as a plate : http://www.ebay.com/itm/EVER-READY-DL92-3S4-or-N17-or-1P10-VINTAGE-BOXED-TESTED-NOS-VALVE-/190892228466
22:48 katsmeow-afk "using your gas furnace as an audio power amplifier"
22:48 katsmeow-afk uummmmm, why is all that bass coming out of your furnace flue?
22:53 katsmeow-afk yanno, with a sale like http://www.ebay.com/itm/380707383516 , 4 watts per cell, if you pay $1 per cell, it's 25 cents per watt?????
23:06 katsmeow-afk http://www.ebay.com/itm/Vintage-Vacuum-Tube-International-50C5-HL92-NOS-Tested-/300955348773 <<-- squared oval cylinder plate
23:07 katsmeow-afk 50v 150ma filament, output good for 2 watts at 140vdc max on the plate
23:07 katsmeow-afk whole slew of the 6v tubes were cylinders too
23:08 katsmeow-afk http://www.ebay.com/itm/Vintage-Ford-Motor-Co-6V6-GT-Stereo-Tube-0251-485-73-/400543782693 <<== 6V6 tube plated tube
23:09 katsmeow-afk yep, made by Ford
23:21 katsmeow-afk it wasn't sterio either
23:22 katsmeow-afk i wonder if the smoke has gone down enough i can go back outside a while
23:33 katsmeow-afk it's almost never sunny at night