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flexible circuit board material works in wax-deposition printers!

by Jake

http://www.instructables.com/id/DIY-Flexible-Printed-Circuits/ Get some thin sheets of polyimide which have copper on one or both sides. Polyimide is a yellow polymer with a high melting temperature and is sometimes called Kapton. A common type of copper-coated polyimide is DuPont "Pyralux" material. Pyralux sheets come in many different varieties of polyimide thickness, copper thickness and adhesive thickness (the "adhesive" is between the copper and polyimide holding everything together.) Copper thickness is given in oz per square foot, while adhesive and Kapton thickness is given in mil (1 mil =0.001 inch). Pyralux LF7062 (pictured) has 1/2 oz Cu, 1/2 mil adhesive and 1 mil Kapton. This works OK but is a bit thin and crinkly for the printer to handle. LF9120 has 1 oz Cu, 1 mil adhesive and 2 mil Kapton - seems to work best in the printer LF9210 has 2 oz Cu, 1 mil adhesive and 1 mil Kapton - stiffer, but works OK Other options are double sided copper ( a sandwich of Cu/Kapton/Cu held together with adhesive) and a roughened surface, denoted by R at the end of the part number. The roughened sheets and double sided sheet work OK. However, Pyralux with 2 oz or thicker copper can be difficult to feed to the printer, especially if there is copper on both sides. See if you can get a free sample from DuPont. Occasionally, Pyralux sheets turn up on eBay. Cut the Pyralux sheets to 8.5x11 or 8.5x14 inches with scissors or a knife. Avoid smudging the copper with fingerprints or oil, which can block the etch solution later. To protect the printer, try to keep the edges relatively flat and free of burrs. For direct printing on the copper film, locate a solid-ink printer. These are commonly confused with laser printers, but instead print melted wax. Unlike most inkjets, the wax makes a good protective layer for copper etching, and unlike laser printers, solid ink printers don't rely on locally charging the paper surface, which could be troublesome when the paper is replaced by a copper sheet. Some models are Tektronix Phaser 840, 850, 860, and Xerox Phaser 8200, 8400, 8500, 8560, and 8860. You might find one in an office. Most Phaser models are regular laser printers, so check under the hood for the solid ink blocks (pictured) if you're not sure. If you don't have access to a solid ink printer, the "toner transfer" iron on method, using a laser-printed design, could replace this step.

11 years, 10 months

Fwd: Saturday October 26th Event - Large Space Closed.....

by mattsenate＠gmail.com

// Matt ----- Forwarded message ----- From: "Laurie Cooperman Rosen" <Lscoop(a)comcast.net> To: "'Laurie Cooperman Rosen'" <Lscoop(a)comcast.net> Subject: Saturday October 26th Event - Large Space Closed..... Date: Fri, Oct 25, 2013 08:15 Hi All-This is a reminder to let you know that the large common space in 2141 has been rented out for a private event this Saturday evening, October 26th. Please try to minimize trips in/out of your office if you are located within the space, and please do not enter the common space unless you are heading directly to a room there or for handicapped elevator use. Sudo room, if you could open the door into the rear elevator and have folks use elevators to come up instead of walking through the big space, that would be great.Thanks so much for your consideration!Laurie & George

11 years, 10 months

[free crap alert] 9x 275 gal totes free - there's a catch

by Hol Gaskill

4 of them are partially full of glycerin http://sfbay.craigslist.org/eby/zip/4135679267.html let your aquaponics / apocalypse survival / burning man dreams come true!

11 years, 10 months

Fri Oct 25 630PM. Alameda Amtur radio mtg. SRoom Radio Xmtr help. - Fwd: Monthly Meeting Notice

by giovanni_re

SRoom needs advisers re FM radio transmitter location. Renting tower space? Free? Meet the Alameda radio operators, who might want to help. Arrive b4 630pm to be early to talk b4 the meeting starts. Loc: Alameda air base, through tunnel from Oakland. Cass Carrington, age ~33, HP web technologist is club president. Members know about broadcast radio & xmitters, etc. Bonus: Glen Rickerd speaks re wifi networks. Glen is leading the setup of a net in Concord. ----- Original message ----- From: ARCA secretary <secretary(a)arcaham.org> To: ARCA secretary <secretary(a)arcaham.org> Subject: Monthly Meeting Notice Date: Tue, 22 Oct 2013 21:32:54 -0700 ARCA members and friend alike. This Friday 25th we will be holding our October Meeting. The meeting will be held at our usual meeting place at 431 Stardust Place, Alameda beginning at 7:00 pm. This month our speaker will be Glen Rickerd, NO6W who will cover the fascinating topic of Boardband Hamnet. A very different and contemporary topic!, see the attached agenda for more details. Please join us on Friday, and bear in mind that the talk will be at the beginning of the meeting so be there early! 73 David, KI6AWR ARCA Secretary. --- Join the BerkeleyTIP-Global mail list - http://groups.google.com/group/BerkTIPGlobal. All Freedom SW, HW & Culture.

11 years, 10 months

Fwd: You are invited to Oaktown Tech: Who's Who & Who's Here. Nov 20th

by Marina Kukso

---------- Forwarded message ---------- From: The Kapor Center for Social Impact <cedric(a)kaporcenter.org> Date: Thu, Oct 24, 2013 at 9:59 AM Subject: You are invited to Oaktown Tech: Who's Who & Who's Here. Nov 20th To: Vicki Knox <oakland(a)localwiki.org> ** OAKTOWN TECH: WHO'S WHO & WHO'S HERE View this email in your browser<http://us7.campaign-archive2.com/?u=8af49d64be3e65b83928182f7&id=ac84bf1496…> This email was sent to oakland(a)localwiki.org *why did I get this?*<http://kaporcenter.us7.list-manage.com/about?u=8af49d64be3e65b83928182f7&id…> unsubscribe from this list<http://kaporcenter.us7.list-manage1.com/unsubscribe?u=8af49d64be3e65b839281…> update subscription preferences<http://kaporcenter.us7.list-manage1.com/profile?u=8af49d64be3e65b83928182f7…> Kapor Center for Social Impact · 2201 Broadway · Suite 725 · Oakland, CA 94612 · USA [image: Email Marketing Powered by MailChimp]<http://www.mailchimp.com/monkey-rewards/?utm_source=freemium_newsletter&utm…>

11 years, 10 months

Fwd: 3rd Screening of "Hip Hop Is Bigger Than The Occupation - San Francisco Monday Oct 28

by Matthew Senate

Highly recommend, please share far and wide! // Matt ---------- Forwarded message ---------- From: Nancy Mansour <shadiamanagement(a)gmail.com> Date: Wed, Oct 23, 2013 at 9:57 PM Subject: Fwd: 3rd Screening of "Hip Hop Is Bigger Than The Occupation - San Francisco Monday Oct 28 To: Matthew Senate <mattsenate(a)gmail.com> ---------- Forwarded message ---------- From: Nancy Mansour <shadiamanagement(a)gmail.com> Date: Wed, Oct 23, 2013 at 9:56 PM Subject: 3rd Screening of "Hip Hop Is Bigger Than The Occupation - San Francisco Monday Oct 28 To: "eir-organizers(a)googlegroups.com" <eir-organizers(a)googlegroups.com> Existence is Resistance has finally made it to the West Coast and after screening our documentary "Hip Hop Is Bigger Than The Occupation"in Oakland last weekend, we are screening again THIS MONDAY in San Francisco. *View Trailer: http://youtu.be/PGvP0OREI2E* *Facebook Event Page: https://www.facebook.com/events/594600013935599/?source=1* Hip Hop is Bigger than the Occupation is a documentary about a ten day journey of artists traveling through Palestine, teaching and performing nonviolent resistance through the arts. The tour included M1 of Dead Prez, Shadia Mansour, Marcel Cartier, Mazzi of Soul Purpose, DJ Vega Benetton, Lowkey, Jody McIntyre and Trinidad, Brandon and Lavie from the South West Youth Collaborative/University of Hip Hop Chicago. Staying in the heart of Balata Refugee Camp at the Yafa Cultural Center in Nablus the group witnesses night raids, toured places like Hebron where there are roads for the Arabs and roads for the Jews, they meet families of shaheeds as well as young Palestinians who have been jailed, shot and humiliated. The group visits Bi’lin where they get shot at and tear gassed and experience first hand what it felt like living under occupation.

11 years, 10 months

feedback from saturday's screening - hip hop is beigger than the occupation

by AnimationAmber .

so bummed that i missed the screening of "hip hop is bigger than the occupation" this past saturday. anyone make it? any feedback? for any folks this side of the bay, it looks like they're screening it in san francisco this monday, flier attached. peace! -amber -- *Animator Mama You-Tube Channel<http://www.youtube.com/user/videocabulary/videos?view=0> * *Animator Mama on Tumblr <http://animatormama.tumblr.com/>*

11 years, 10 months

[Consensus] Event Expectations (incl. Last-Minute / Controversial)

by Matthew Senate

Hey all, we reached consensus on this tonight: - Categories of events we strongly discourage: - events not open to the public (already a long established policy) - events sponsored by or held by arms manufacturers or defense industry - possible other categories if they arise - list acknowledged as incomplete - There won't be extra infrastructure for vetting events but these values will be applied do-o-cratically by the community. To help with this, we strongly encourage tags to be used on the mailing list: - [event] for events - [!] for urgent or potentially controversial things Additionally, do-ocratically, here are some relevant action items: - Phone trees - notification of email only. - Calls / Texts you? - Tom :D - Contacts for awesome event collaboration, for feedback on last-minute events - Timon, Marc, Tom, Matt

11 years, 10 months

Giovanni here to talk about low-power FM broadcast radio at meeting

by mattsenate＠gmail.com

We can apply to get a license, learn how! // Matt

11 years, 10 months

Event using the common area Saturday 10/26

by Yardena Cohen

There will be an event in the common area this coming Saturday (10/26), starting at 9am and going all day. It appears to involve electronic music. They are renting the space directly from George, including the big common room and all the vacant side rooms. George is asking us to make sure the space is clean and cleared out before they begin, ideally the night before.

11 years, 10 months

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