X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com X-Injected-Via-Gmane: http://gmane.org/ To: geda-user AT delorie DOT com From: Kai-Martin Knaak Subject: Re: [geda-user] [OT] I need help with selecting components Date: Tue, 21 Jul 2015 22:27:19 +0200 Organization: Institut =?UTF-8?B?ZsO8cg==?= Quantenoptik Lines: 132 Message-ID: References: <1507211704 DOT AA02900 AT ivan DOT Harhan DOT ORG> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" X-Complaints-To: usenet AT ger DOT gmane DOT org X-Gmane-NNTP-Posting-Host: 130.75.103.107 User-Agent: KNode/4.14.1 Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id t6LKRg6U005942 Reply-To: geda-user AT delorie DOT com Spacefalcon the Outlaw wrote: Hi Spacefalcon. Nice to see you on this list. I got to know you from the openmoko mailing list. I agree with much of your diagnosis why openmoko was so underhelming. Would put in a less radical way, though. I hope your dumb phone project advances. If it actually delivers, I may be interested in a copy. > some recommendations as to what parts I can use I am based in Germany so my choice of distributors may not be viable to you. The parts should be available worldwide, anyway. > 1. A pushbutton switch for power-on and reset buttons. I'd use one of the "microswitches" wich come in various heights. Any of these at TME would do: http://www.tme.eu/en/katalog/#id_category=113048&s_field=niski_prog&s_order=ASC The four pin version is fairly generic. Compatible switches are sold by many manufacturers. When in doubt, I go for the most cost effficient. I tend to have a bunch of these in the drawer: http://www.tme.eu/en/details/tact-67n-f/microswitches-tact-pcb/ninigi/ My geda footprint for this button: http://www.gedasymbols.org/user/kaimartin_knaak/footprints/switches/TYCO_FSMJ.fp My corresponding symbol with the footprint preselected: http://www.gedasymbols.org/user/kaimartin_knaak/symbols/misc/button.sym > I am building > a board based on a cellphone chipset, and the power management chip > has a PWON pin that needs to be connected to GND through a > pushbutton switch for power-on control. Just to be sure: Only a short connection to GND is required, is it. If it needs to be a permanent connection, I'd go for one of these switches: http://www.tme.eu/en/details/esp1010/slide-switches/ece/ The footprint for this switch is fairly generic -- just three pins in 2.54 mm distance. > 2. A simple LED that shines upward from the board. Any SMD LED would do. I kind of arbitrarily chose these 0805 sized chips. red: http://www.tme.eu/en/details/of-smd2012r/smd-colour-leds/optoflash/# green: http://www.tme.eu/en/details/kp-2012zgc/smd-leds-0805/kingbright-electronic/# > 3. What would be a "good" or "reasonable" connector to use for > connecting a lab bench power supply? I like the IL-G series by JAE. These combine smallish size with a good fit and reasonable high force to disengage and reasonable high current rating. Two pin pcb header: http://www.mouser.de/ProductDetail/JAE-Electronics/IL-G-2P-S3T2-SA/?qs=%2fha2pyFaduihxdZ7fakcyjwa5rD0xLHVE5rhJT9guR7%2f4PS8AIW8%2fg%3d%3d Two pin cable receptacle: http://www.mouser.de/ProductDetail/JAE-Electronics/IL-G-2S-S3C2-SA/?qs=%2fha2pyFaduihxdZ7fakcyhBQCbR8deVFRGr5DtTgu6doTN3jjPmnow%3d%3d My geda footprint: http://www.gedasymbols.org/user/kaimartin_knaak/footprints/connectors/JAE_IL-G/PS_2PIN.fp The corresponding symbol: http://www.gedasymbols.org/user/kaimartin_knaak/symbols/connectors/PS-2.sym If the reasonable high force is not needed, I go for "PSK" connectors. This is the kind that is used in mother boards to connect the fan. These fit into the same footprints as the JAE connectors. The German distributor Reichelt sells a range of both types of connectors ready made with short cable pig tails. If these don't fit due to power requirements, I'd go for the 368 series by RIACON. These are compatible to the MC 3.81 series by PHOENIX CONTACT. I buy them from the German distributor Reichelt. Recepticle: http://www.reichelt.de/AKL-383-02/3/index.html?&ACTION=3&LA=446&ARTICLE=36655&artnr=AKL+383-02 Plug: http://www.reichelt.de/AKL-249-02/3/index.html?&ACTION=3&LA=446&ARTICLE=36686&artnr=AKL+249-02 footprint: http://www.gedasymbols.org/user/kaimartin_knaak/footprints/connectors/RIACON/RIACON_383_2PIN.fp > I expect my board to draw up to perhaps 2.5 A of current during GSM > radio Tx bursts If it is just short bursts, I wouldn't worry too much. Maximum current for connectors relates to mean power over several seconds. HTH, ---<)kaimartin(>--- -- Kai-Martin Knaak tel: +49-511-762-2895 Universität Hannover, Inst. für Quantenoptik fax: +49-511-762-2211 Welfengarten 1, 30167 Hannover http://www.iqo.uni-hannover.de GPG key: http://pgp.mit.edu:11371/pks/lookup?search=Knaak+kmk&op=get