You guys are correct! My feeble old mind mixed up George's birthday and Pres day. Well atleast I woke a few of you up!<grin> Cheers Gene...
42039
Robert Crichton
parnslayer
Feb 11, 2010 10:58 pm
The meeting should be on the 20th, not the 13th, so President's day should have no effect. -Bob Crichton...
42038
Mike Payson
mpayson
Feb 11, 2010 10:58 pm
Hey Gene, You had me worried for a while, but if I'm not mistaken, Presidents day is this Monday, but the meeting isn't until the 20th. Hopefully that is...
42037
homeshopguy
gene98329
Feb 11, 2010 4:40 pm
Does this mean the college will be closed again and no meeting? Gene Gig Harbor, WA...
42036
Fenchurch
fenagogue
Feb 9, 2010 1:08 am
Looking for a new way to work out those project problems you have been having? Try out the Seattle Robotics Monday Night Chat! Richard I hear the Freenode has...
42035
John Palmisano
palmisano@...
Feb 6, 2010 3:40 pm
Just an FYI, Dagu practices forum/email spamming (the bad kind). I've had to ban them multiple times in the past, despite many warnings. John Palmisano ...
42034
Peter Balch
peterbalch@...
Feb 6, 2010 12:17 pm
... I've played with polymorph several times - including making werewolf fangs - but have never managed such a beautiful finish. It always comes out a bit ...
42033
Duane Blanchard
blanchau
Feb 6, 2010 12:56 am
Hello, I'm looking to share an order of Polymorph to keep shipping costs reasonable. The best deal I can find is from DAGU in Taiwan. Does anyone know a better...
42032
Fenchurch
fenagogue
Feb 5, 2010 8:05 pm
Someone that might want to get a scope and not pay shipping, the Tacoma Goodwill store has on the Goodwill auction site this scope. ...
42031
Tony Mactutis
matapang007
Feb 5, 2010 5:57 am
TI is having a fire sale on their microcontroller development boards. I have used TI processors for years and have always found them to be head and shoulders...
42030
Peter Balch
peterbalch@...
Feb 4, 2010 1:21 am
Richard ... I suspect I'm going to have to rule out 20kHz PWM from a cheap PIC. ... True but even with children, there's not much energy above 8kHz in an S ...
42029
Richard Greenway
fenagogue
Feb 3, 2010 7:00 pm
TI also has a line of Class D amplifier chips that use PWM inputs (Pure Path Digital is their marketing term for it) Which may be better suited for you. Small...
42028
Alan Marconett
km6vv
Feb 3, 2010 6:14 pm
Robin, Did you go ahead and use Schmart Boards in your project? Alan KM6VV _____ From: On Behalf Of Robin Hewitt There are SchmartBoards for BGAs. - Robin ...
42027
Robin Hewitt
get_imaginary
Feb 3, 2010 5:12 pm
________________________________ From: Peter Balch <peterbalch@...> To: SeattleRobotics@yahoogroups.com Sent: Wed, February 3, 2010 3:32:51 AM ...
42026
Doug Bell
douglas_warr...
Feb 3, 2010 1:33 pm
Your PWM is the kind that would need an output filter to remove the 20 kHz note. If you do this before you go into the analog input of a class D amp chip, your...
42025
David Buckley
robots42
Feb 3, 2010 1:30 pm
Well having just revisited the SPO256 where the 'speech' is PWMed out and various filters were suggested in the data sheets I think there is more to getting...
42024
Peter Balch
peterbalch@...
Feb 3, 2010 11:43 am
Richard ... Interesting idea. I'll look into those ... They look like nice chips. Unfortunately, some of the nicest are only available as Ball Grid Array...
42023
Peter Balch
peterbalch@...
Feb 3, 2010 11:42 am
Doug ... Yes, that one looks excellent. The whole TPA2000D1, TPA2001D1, TPA2005D1, TPA2006D1, TPA2014D1 looks good. ... By "quality" you mean low freq...
42022
David Buckley
robots42
Feb 3, 2010 11:20 am
Well Recently I bought some 'iPod' speakers to put on TecFoot and Freya ( I have a lot of SPO256s to use up), 1.25"dia 8 ohm speaker and 3v AA operation, they...
42021
Doug Bell
douglas_warr...
Feb 3, 2010 10:54 am
You need to convert the current to RMS as well. 1.25 A peak = 884 mA RMS. Or, you can convert the peak power to average power: 5 V peak x 1.25 A peak = 6.25 W...
42020
Peter Balch
peterbalch@...
Feb 3, 2010 9:52 am
David ... Good question. It's a battery powered unit - 4 AAs - so mW.hours really matter. The average modern speaker is _really_ inefficient - maybe less than...
42019
"Dairyo Gokan(€ ...
nand@...
Feb 3, 2010 3:55 am
Hello Peter, If you just want to increase drive current to drive low resistance load, MICROCHIP's MCP1405 or similar device may fit. MCP1405 can be drive by...
42018
Randy M. Dumse
rmdumse
Feb 2, 2010 10:10 pm
Peter Balch asid: Tuesday, February 02, 2010 10:08 AM ... Since you have a 4 ohm coil, as David said, you're limited to max about an amp at 5V. It would be a...
42017
David Calkins
askelad
Feb 2, 2010 8:30 pm
Only two and a half months to go before the big show, and we need you to register! Everyone loves to wait til the last minute (hey, all robot builders are ...
42016
Richard Greenway
fenagogue
Feb 2, 2010 7:47 pm
As you said, you are making a Class D amplifier. Your best bet may just be to use one of the TI Inductorless Class D amplifier chips. (they are designed for...
42015
David Buckley
robots42
Feb 2, 2010 5:45 pm
What sort of speaker are you using? From 5v you can't ever get more than 1.25A into a 4ohm speaker!!!!! David ... From: Peter Balch To:...
42014
Peter Balch
peterbalch@...
Feb 2, 2010 4:08 pm
Hi I'm trying to find an H-bridge driver chip. It's to drive a loudspeaker from the PWM output of a PIC. I've used the PIC's ADC to record some speech in 8-bit...
42013
Fenchurch
fenagogue
Feb 1, 2010 7:36 pm
Looking for a new way to work out those project problems you have been having? Try out the Seattle Robotics Monday Night Chat! Richard I hear the Freenode has...
42012
David Buckley
robots42
Feb 1, 2010 7:28 pm
Ah, I thought it was advice to a 16 year old, my mistake, I apologise. ... From: drugrepin_florida To: SeattleRobotics@yahoogroups.com Sent: Monday, February...
42011
drugrepin_florida
drugrepin_fl...
Feb 1, 2010 6:00 pm
Thank you for your concern. At first I felt insulted by your comments but not fully understanding your intentions, I will just accept that you don't know my...
