gmane.comp.hardware.microcontrollers.pic

Re: [EE] Solenoid valves

Dave Schmidt — 2008-08-21T17:11:51

What fluid? (air, water?) Clippard makes small ones for air and I've bought them resonably from their stocking distributors. I just 'built' a pn from this website. $22.05 http://www.clippard.com/store/byo_electronic/byo_mouse_valves.asp Martin wrote:

Re: [EE] Solenoid valves

Funny NYPD — 2008-08-21T16:08:48

one disadvantage on ebay is: there is few datasheet, and not always good quality guarantee. Funny N. Au Group Electronics, New Bedford, MA, http://www.AuElectronics.com ----- Original Message ---- From: Nicola Perotto nicolaperotto.it> To: Microcontroller discussion list - Public. mit.edu> Sent: Thursday, August 21, 2008 11:49:26 AM Subject: Re: [EE] Solenoid valves http://stores.ebay.com/valves4projects Good and cheap! Martin wrote:

Re: [EE] Solenoid valves

Carl Denk — 2008-08-21T17:08:20

Asco makes a large selection of valves, then check the distributor list http://www.ascovalve.com/applications/products/SolenoidValves.aspx Martin wrote:

Re: [EE] Solenoid valves

Carl Denk — 2008-08-21T17:05:58

We have a huge Mcmaster (and Graingers) warehouses near us on the Southeast side of Cleveland. I stopped in the Mcmaster, and was able to fill out at catalog request, a few weeks later it arrived. This was 2 years ago. I have received order several weeks ago. Funny NYPD wrote:

Re: [OT]: nuntio vobis

Vasile Surducan — 2008-08-21T16:59:56

An italian talking latin does not surprising me, but an english man in Ithaca (Ithaca is in Grece not in NY) , that's weird. :) http://en.wikipedia.org/wiki/Ithaca,_New_York On 8/21/08, Sean Breheny cornell.edu> wrote:

RE: [PIC] Device for 3 PWM apps?

gardenyu — 2008-08-21T16:51:23

A company called Allegro has some pretty good 3 phase gate driver chips, with 100% duty cycle possible on each leg. http://www.allegromicro.com/en/Products/Categories/ICs/motor.asp That's for 3 phase motor control, but you can check whether it fits your design too. _________________________________________________________________ 看MSN史诗巨片，票选人气角色，赢取PSP等诸多好礼！ http://im.msn.cn/-- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist

Re: [PIC] Device for 3 PWM apps?

Olin Lathrop — 2008-08-21T16:48:32

Bad idea. So then where are your "strings" of LEDs? Are those separate? In any case 300mA is not a good excuse for a darlington (very little is). Transistors with a minimum gain of 50 are readily available, so that means you need 300mA/50 = 6mA base current. The PIC can source that directly with plenty of margin. Even if I wanted to keep the PIC pin current low an use a additional transistor, I still wouldn't hook it up in a darlington configuration. You can have a first NPN driving the second NPN, but collector of the first NPN can go to Vdd. Connecting it to the collector of the second transistor would be a bad idea. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000.

Re: [EE] Solenoid valves

M. Adam Davis — 2008-08-21T16:35:22

I imagine the person was either kidding, or meant that their regional office was closing. McMaster, I expect, isn't going away anytime soon. They are a big enough company that if they were having troubles that were bad enough that customers were finding out about them, then it'd be in the news. However, they are very picky about who they'll send their printed catalog to. They aren't interested in supplying parts as an OEM (ie, parts that go in products that are sold) but rather parts that are used by their customer directly, such as to repair machinery, maintain an assembly line, or build lab equipment. You can see that they aren't terribly competitive on price, and don't have quantity discounts that would suggest they expect their customers to resell them, or integrate them into a medium to high volume product. As such, they call each person that requests a catalog and then decide whether to send one based on the type of customer they expect them to be - though I expect that order history has a large effect on this decision as well. You can see that old catalogs are traded on ebay for more than a few dollars for something that is supposedly 'free' - they are artifically scarce, and yet very desirable in some industries. So he may also have been telling you those things because you are not their 'ideal' customer. Or maybe he was having a bad day, who knows... -Adam * I sat through one of their recruiting seminars and went through the interview process. Very interesting company... On 8/21/08, Funny NYPD yahoo.com> wrote:

Re: [OT]ebay seller is quitting.

Funny NYPD — 2008-08-21T16:06:37

Actually Craigslist is also good on job hunting. The company is still a private hold company though their business is huge. The last time I heard: there are only about 25 employees (or a very small number, not so sure). It is amazing, so limited people run such a large online business. There are many features are still free, like house renting, etc. People says, if you are living in New York city, you better visit Craigslist for opportunities. Funny N. Au Group Electronics, New Bedford, MA, http://www.AuElectronics.com ----- Original Message ---- From: Martin nnytech.net> To: Microcontroller discussion list - Public. mit.edu> Sent: Thursday, August 21, 2008 11:06:05 AM Subject: Re: [OT]ebay seller is quitting. John Ferrell wrote: Craigslist is very big in densely populated areas. Not nearly as flashy as eBay though which is often a good thing. There are plenty of people who never use computers (or their brain) and hence can't type sentences or even whole words though. It makes the piclist look like the "grammarlist" - Martin

Re: [OT]ebay seller is quitting.

Funny NYPD — 2008-08-21T15:59:04

Not sure Google Checkout will be the next ebay alternative or not? At least the "google checkout" cannot compete with paypal at this moment for small online business. The function of "google checkout" is not as powerful as paypal though its fee is 1% less than paypal. Funny N. Au Group Electronics, New Bedford, MA, http://www.AuElectronics.com ----- Original Message ---- From: John Ferrell earthlink.net> To: Microcontroller discussion list - Public. mit.edu> Sent: Thursday, August 21, 2008 10:52:55 AM Subject: Re: [OT]ebay seller is quitting. The changes have been great for their competition. They seem to be unaware that they are creating "niches" for specialty items. There is more auction outside of eBay than inside on Radio Control models now. I was disappointed with the charges for the last couple of items I sold. Once again the trivial junk just goes to the dump. John Ferrell W8CCW "All that is necessary for the triumph of evil is for good men to do nothing." -- Edmund Burke http://DixieNC.US ----- Original Message ----- From: "Funny NYPD" yahoo.com> To: mit.edu> Sent: Thursday, August 21, 2008 9:57 AM Subject: [OT]ebay seller is quitting.

Re: [EE] Solenoid valves

Nicola Perotto — 2008-08-21T15:49:26

http://stores.ebay.com/valves4projects Good and cheap! Martin wrote:

Re: [EE]: arp tables

Tomás Ó hÉilidhe — 2008-08-21T14:57:36

I've already responded to this under the "OT" tag so take a look at that reply if you're interested. For the meantime, I'll reply in sequence below: Justin Richards wrote: Yes, the purpose of the ARP request is to figure out what MAC address the frame should be sent to. Correct. Correct. If you go through a router such as 10.10.10.1, then you send out an ARP request for 10.10.10.1, you do *not* send out an ARP request for 192.168.0.1. In order to find out which router you should go through to get to a particular address (or even if you need to go through a router at all), you consult your Route Table. Correct. But it *will* results in the router's address being added to the ARP table. You'll never see an ARP table entry for a device that isn't on the same Ethernet wire. (Please don't bring up the topic of VPN's haha) I tried to give an explanation of how it all works in my other "OT" reply.

Re: [SX] Is the Scenix Chip Alive?

Funny NYPD — 2008-08-21T15:54:05

Cygnal sure is a good silicon designer expect its price. It has much less silicon errata than microchip. And they used to be a fabless supplier. Not sure they now manufactur in-house or not after join silicon-lab. Funny N. Au Group Electronics, New Bedford, MA, http://www.AuElectronics.com ----- Original Message ---- From: Spehro Pefhany interlog.com> To: piclist< at >mit.edu Sent: Thursday, August 21, 2008 11:23:21 AM Subject: Re: [SX] Is the Scenix Chip Alive? Quoting Pete Calinski gmail.com>: As others have said, Parallax is the owner. For a new design that requires high timer resolution you might want to look at the C8051F353R from Silabs (50MHz, they also have 100MHz) or the 40-MIPS PIC24. More CISC-y than RISC-y, I know, but probably longer design life 4U. Best regards, Spehro Pefhany

Re: [EE] Solenoid valves

Martin — 2008-08-21T15:49:19

I thought I had checked there but I checked again and found a valve for $51 - thanks! - Martin

Re: [EE] Solenoid valves

Funny NYPD — 2008-08-21T15:50:31

Is mcmaster still alive? The last time I called for a catalog, I was told the catalogs are out of stock and they are prepare to close the business. The guy must be kidding me. I used to buy a lot of stainless pipes from them. Funny N. Au Group Electronics, New Bedford, MA, http://www.AuElectronics.com ----- Original Message ---- From: William Bross cinci.rr.com> To: Microcontroller discussion list - Public. mit.edu> Sent: Thursday, August 21, 2008 11:10:24 AM Subject: Re: [EE] Solenoid valves Martin wrote: Martin, goto and search on solenoid valves. Lots of materials / seals / voltages to choose from. Bill

Re: [AD]CB0703 1cent/PCB deal ends after Labor day (Sept-01-2008)

Funny NYPD — 2008-08-21T15:47:04

Actually, if you already have the PIC18F2550 and 24LC512, which count about 20-30% of the total material cost, the low cost "ICKCB0703 - CB0703 Electronic Components Kits without U1, U3, U4" is not a bad deal at all. There are many people seems really enjoy the process of do-it-yourself. We do see some of them came back buy more CB0703 kits once they succeeded on the first run. It is quite interesting Massachusetts and Texas are the top two states on our CB0703-DIY-kits customer list. Funny N. Au Group Electronics, New Bedford, MA, http://www.AuElectronics.com ----- Original Message ---- From: Martin nnytech.net> To: Microcontroller discussion list - Public. mit.edu> Sent: Thursday, August 21, 2008 10:55:52 AM Subject: Re: [AD]CB0703 1cent/PCB deal ends after Labor day (Sept-01-2008) Vitaliy wrote: I don't know. I have most of the parts in stock except for the PICs which I'll get as samples. I'll probably just have to buy the USB sockets. - Martin

Re: [EE] FePH batteries

'Grif' — 2008-08-21T15:44:46

Are you able to source the cells in smallish numbers individually, or are you "harvesting" from Bosch products? -----Original Message-----

Re: [PIC] Device for 3 PWM apps?

Rodent of Unusual Size — 2008-08-21T15:45:19

Because the LEDs are in parallel (forgot to mention that), so it's 300mA nominal, not 30mA.

Re: [SX] Is the Scenix Chip Alive?

Spehro Pefhany — 2008-08-21T15:23:21

Quoting Pete Calinski gmail.com>: As others have said, Parallax is the owner. For a new design that requires high timer resolution you might want to look at the C8051F353R from Silabs (50MHz, they also have 100MHz) or the 40-MIPS PIC24. More CISC-y than RISC-y, I know, but probably longer design life 4U. Best regards, Spehro Pefhany

Re: [SX] Is the Scenix Chip Alive?

Dwayne Reid — 2008-08-21T15:20:02

Click on the big "SX" logo near the top of the page. Parallax purchased the distribution rights for the Scenix family. dwayne

Re: [EE] Solenoid valves

William Bross — 2008-08-21T15:10:24

Martin, goto and search on solenoid valves. Lots of materials / seals / voltages to choose from. Bill