gEDA-user: ben mode
... is now called photo mode with suitable option changes. The old --ben-* options still work, but are no longer documented. ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: electrolytic capacitors
On Dec 27, 2008, at 5:40 AM, Robas, Teodor wrote: Do not count on this kind of capacitors: http://deep-blue.ro/tmp/chinese%20capacitor.jpg :)) Oh. My. God. *shudder* That does it...I'm now going to stick EVERY ELECTROLYTIC CAPACITOR I BUY on a bridge before I use it. -Dave -- Dave McGuire Port Charlotte, FL ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: electrolytic capacitors
On Saturday 27 December 2008, Robas, Teodor wrote: Do not count on this kind of capacitors: http://deep-blue.ro/tmp/chinese%20capacitor.jpg :)) What a ripoff. No way in hell that would last more than a day, if that long with 50 volts of bias on it, (I'd guess 10 minutes max) and I'd have doubts even the dual can would contain the debris. I take it you got curious when incoming QC said they weren't in spec? BTW, that is a neat opening of the can you did. They can explode pretty violently, so let me tell you a story. Back in the mid-60's I came across a tube type, mobile cb radio that had to be one of the few attempts to build one for a 6 volt vehicle system, and predated the old Johnson whiteface by probably 10 years. My pickup at the time, a 52 ford, had long since been converted to 12 volts, and I was in the radio, on the kitchen table, moving wires to convert it to 12 volts. I missed one without realizing it, and had it running on a 12 volt supply for test. It worked really really well, talking to the neighbors on a piece of wire laying on the floor for an antenna. But after about 15 minutes the main filter capacitor let go, and the top of the can put a quarter sized print in the plastered ceiling that was about 1/4 deep. I'm glad I wasn't in front of it at the time, else I might have been seriously injured. I tried with a 20 oz hammer and could not put a dent that deep in that plaster with it. Putting my meter on the stubs of the cans terminals I found the supply was making a hair over 785 volts, and the can carried a 450 volt label. I cleaned up the mess, replaced the cap, and found the other 2 taps on the transformer that I had missed, and ran that radio till I finally got a transistorized one. But my kids, who were upstairs in bed at the time, have always said, somewhat tongue in cheek, that daddy was shooting at them. :) ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) The best diplomat I know is a fully activated phaser bank. -- Scotty ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: OT: Recommendations for laptop?
On Fri, Dec 26, 2008 at 02:01:12PM -0800, Dave N6NZ wrote: One thing I've always liked about the Thinkpad's/Lenovo's is the excellent feel and behavior of the pressure stick. Works great. My new Lenovo has both a stick (which I like and use) and also a scratcher, which keeps getting in the way because I keep accidentally dragging a finger over it and losing my cursor... Seconded. I have had laptops with all combinations. I quickly adapt to the pressure stick (http://xkcd.com/243/), but to the track-pad, not so much. One more plus for the X40 with pressure stick only: three mouse buttons. - Larry ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: electrolytic capacitors
Gene Heskett wrote: They can explode pretty violently, so let me tell you a story. Back in the mid-60's I came across a tube type, mobile cb radio that had to be one of the few attempts to build one for a 6 volt vehicle system, and predated the old Johnson whiteface by probably 10 years. My pickup at the time, a 52 ford, had long since been converted to 12 volts, and I was in the radio, on the kitchen table, moving wires to convert it to 12 volts. I missed one without realizing it, and had it running on a 12 volt supply for test. It worked really really well, talking to the neighbors on a piece of wire laying on the floor for an antenna. But after about 15 minutes the main filter capacitor let go, and the top of the can put a quarter sized print in the plastered ceiling that was about 1/4 deep. I'm glad I wasn't in front of it at the too funny. My exploding cap story is also related to automotive electronics. The explosion happened at 2 AM when I was in high school. Mom and Dad were not too thrilled about it if I recall correctly. Makes a lasting impression though doesn't it? -Dan ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: electrolytic capacitors
On Dec 27, 2008, at 2:17 PM, Dan McMahill wrote: They can explode pretty violently, so let me tell you a story. Back in the mid-60's I came across a tube type, mobile cb radio that had to be one of the few attempts to build one for a 6 volt vehicle system, and predated the old Johnson whiteface by probably 10 years. My pickup at the time, a 52 ford, had long since been converted to 12 volts, and I was in the radio, on the kitchen table, moving wires to convert it to 12 volts. I missed one without realizing it, and had it running on a 12 volt supply for test. It worked really really well, talking to the neighbors on a piece of wire laying on the floor for an antenna. But after about 15 minutes the main filter capacitor let go, and the top of the can put a quarter sized print in the plastered ceiling that was about 1/4 deep. I'm glad I wasn't in front of it at the too funny. My exploding cap story is also related to automotive electronics. The explosion happened at 2 AM when I was in high school. Mom and Dad were not too thrilled about it if I recall correctly. Makes a lasting impression though doesn't it? Years ago, I had a friend who used to have some pretty wild parties. Sometimes us geekier types would head down to the basement with him, fairly drunk, and start blowing up small (very small) electrolytic capacitors with a nice power supply that he had set up for exactly that purpose. He had a box of hundreds of capacitors that he'd harvested from old PCBs. It was great fun. :) -Dave -- Dave McGuire Port Charlotte, FL ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
Re: gEDA-user: electrolytic capacitors
On Saturday 27 December 2008, Dan McMahill wrote: Gene Heskett wrote: They can explode pretty violently, so let me tell you a story. Back in the mid-60's I came across a tube type, mobile cb radio that had to be one of the few attempts to build one for a 6 volt vehicle system, and predated the old Johnson whiteface by probably 10 years. My pickup at the time, a 52 ford, had long since been converted to 12 volts, and I was in the radio, on the kitchen table, moving wires to convert it to 12 volts. I missed one without realizing it, and had it running on a 12 volt supply for test. It worked really really well, talking to the neighbors on a piece of wire laying on the floor for an antenna. But after about 15 minutes the main filter capacitor let go, and the top of the can put a quarter sized print in the plastered ceiling that was about 1/4 deep. I'm glad I wasn't in front of it at the too funny. My exploding cap story is also related to automotive electronics. The explosion happened at 2 AM when I was in high school. Mom and Dad were not too thrilled about it if I recall correctly. Makes a lasting impression though doesn't it? Yup, one I sure won't forget this side of the rapture. It left my ears ringing slightly, but they've done that since back in the mid 60's when I wore out the first 2 barrels on Old Meat in the Pot, shooting on my own property with 2 good sized trees less than 10 feet away from the front of the bench, without earmuffs. The back blast off those trees was substantial. :( Now at 74, I've been considering a hearing aid, but can't seem to get my hand to write a check for a decent used car that fits in my ear. -Dan ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user -- Cheers, Gene There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order. -Ed Howdershelt (Author) Certainly there are things in life that money can't buy, But it's very funny -- did you ever try buying them without money? -- Ogden Nash ___ geda-user mailing list geda-user@moria.seul.org http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
