SeattleRobotics at Yahoo! Groups

Monday Night Chat Reminder

Fenchurch — Tue, 09 Feb 2010 01:08:55 GMT

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

Re: Looking to share an order of Polymorph (Polycaprolactone/ShapeLo

John Palmisano — Sat, 06 Feb 2010 15:40:01 GMT

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

Re: Looking to share an order of Polymorph (Polycaprolactone/ShapeLo

Peter Balch — Sat, 06 Feb 2010 12:17:42 GMT

... 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

Looking to share an order of Polymorph (Polycaprolactone/ShapeLock/t

Duane Blanchard — Sat, 06 Feb 2010 00:56:55 GMT

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

Oscilloscope Deal maybe.

Fenchurch — Fri, 05 Feb 2010 20:05:08 GMT

Someone that might want to get a scope and not pay shipping, the Tacoma Goodwill store has on the Goodwill auction site this scope.

Texas Instruments uC boards on sale

Tony Mactutis — Fri, 05 Feb 2010 05:57:05 GMT

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

Re: H-bridge driver

Peter Balch — Thu, 04 Feb 2010 01:21:54 GMT

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

Re: H-bridge driver

Richard Greenway — Wed, 03 Feb 2010 19:00:22 GMT

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

Re: H-bridge driver

Alan Marconett — Wed, 03 Feb 2010 18:14:49 GMT

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

Re: H-bridge driver

Robin Hewitt — Wed, 03 Feb 2010 17:12:55 GMT

________________________________ From: Peter Balch To: SeattleRobotics@yahoogroups.com Sent: Wed, February 3, 2010 3:32:51 AM

Re: H-bridge driver

Doug Bell — Wed, 03 Feb 2010 13:33:25 GMT

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

Re: H-bridge driver

David Buckley — Wed, 03 Feb 2010 13:30:48 GMT

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

Re: H-bridge driver

Peter Balch — Wed, 03 Feb 2010 11:43:18 GMT

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

Re: H-bridge driver

Peter Balch — Wed, 03 Feb 2010 11:42:48 GMT

Doug ... Yes, that one looks excellent. The whole TPA2000D1, TPA2001D1, TPA2005D1, TPA2006D1, TPA2014D1 looks good. ... By "quality" you mean low freq

Re: H-bridge driver

David Buckley — Wed, 03 Feb 2010 11:20:21 GMT

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