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| 02:13.31 | Mirell | Man, I want this house: http://bit.ly/6VUE3 |
| 03:39.33 | MonMotha | m4t: forward voltage varies slightly with forward current. For a silicon rectifier of that size, figure 0.7-0.9V at 2-3A |
| 03:39.49 | m4t | hey MonMotha |
| 03:39.54 | m4t | so i think i fried the psu anyhow |
| 03:40.00 | m4t | it was a center pin transformer in fact |
| 03:40.16 | m4t | and i guess each of the two negative leads supplies uhm, like 1/2 of the ac wave cycle |
| 03:40.53 | m4t | so without realizing why my multimeter was giving me a varying voltage, i wired the two different leads together and shorted it i think |
| 03:41.00 | MonMotha | well, on a transformer with a center tap, you'll get two outputs of equal voltage (as measured to the CT) but 180 degrees out of phase |
| 03:41.20 | m4t | yess |
| 03:41.20 | m4t | hah |
| 03:41.20 | MonMotha | connecting the two ends together would do bad things, yes |
| 03:41.20 | m4t | i ordered a 12v/2a from ebay actually |
| 03:41.23 | MonMotha | you may have just blow a fuse |
| 03:41.27 | MonMotha | *blown |
| 03:41.31 | m4t | by how hot it was |
| 03:41.36 | m4t | and the epoxy smell |
| 03:41.41 | m4t | i want to say it may have been worse |
| 03:41.45 | m4t | i might try to return it |
| 03:41.46 | m4t | haha |
| 03:41.51 | m4t | i have to desolder it though |
| 03:41.59 | m4t | from the ac plug |
| 03:42.14 | m4t | i was thinking, for whatever ignorant reason |
| 03:42.35 | m4t | that each lead was straight up 6.3v/1.2a dc |
| 03:42.53 | m4t | and that i could combine them |
| 03:43.06 | MonMotha | no, that won't work |
| 03:43.08 | m4t | ii didnt realize they were out of phase and additional circuitry (a rectifier bridge..?) was needed |
| 03:43.09 | m4t | yea... |
| 03:43.19 | m4t | i somewhat understand what it does |
| 03:43.28 | MonMotha | actually, with a center tap, you can do a full wave rectifier without a 4 diode bridge |
| 03:43.30 | MonMotha | only need 2 |
| 03:43.52 | MonMotha | google can probably provide a schematic |
| 03:43.54 | m4t | i bought 2 rectifier diodes for another reason, not realizing this was a 'center tap' with 2x leads |
| 03:44.11 | MonMotha | it's a classic trick from when semiconductors were expensive and transformer work was cheap in comparison |
| 03:44.28 | MonMotha | now, it would cost so much more for the center tap than the extra 2 diodes that nobody really even thinks about it |
| 03:45.00 | m4t | something like: |
| 03:45.10 | m4t | ---[ ||]---\ |
| 03:45.21 | m4t | ---[ |]--/ |
| 03:45.31 | m4t | er, yea |
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| 06:50.11 | methril|work | yo |
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| 13:06.36 | doub | hi, i'm looking for an arm-based microcontroller similar to atmel AT91SAM7A2 (arm7tdmi, ebi, lots of i/o and adc), but with better gnu toolchain support (all atmel source code i've found targets some commercial ide) |
| 13:07.06 | doub | i'd like usb device too (and eventually host), which the sam7a2 is lacking |
| 13:14.17 | HcE | you should be able to use the toolchain generated by Buildroot I think |
| 13:14.33 | HcE | unsure what it ships with linker scripts for the ARM7 stuff |
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| 13:54.21 | chouimat | morning |
| 14:13.05 | florian | hi prpplague |
| 14:13.08 | florian | hi chouimat |
| 14:13.21 | prpplague | florian: greetings earthling |
| 14:14.47 | chouimat | now time to do something ... let clean the mess around here |
| 14:29.26 | doub | HcE: it's low level mcu initialization code examples that are lacking, i'm not planning to run linux or any OS actually, but all the boot code i find for the sam7a2 is asm for commercial assemblers, nothing for gas |
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| 19:29.16 | chouimat | is bored |
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| 19:30.05 | Mirell | Yay, my 20 iPod Sync cables arrived |
| 19:36.33 | agaffney | why do you need that many? |
| 19:37.04 | chouimat | agaffney: I would say the cat loves to steal them ;) |
| 19:37.09 | agaffney | heh |
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| 21:50.16 | Mirell | And they were also $.80 a pop |
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