Search found 10 matches

by Forrest
Thu Dec 28, 2006 8:11 pm
Forum: General Discussion
Topic: Electrolytic capacitors in series...
Replies: 20
Views: 5933

A flashlight with 50 Farad capacitors? For who - King Kong? A 50 Farad capacitor is going to set you back $200 to $400 each and it looks like they weigh 10-20 lbs a piece!
by Forrest
Sat Dec 16, 2006 5:45 am
Forum: Computer Programming
Topic: BASIC to PIC
Replies: 18
Views: 9068

If you're already used to programming in PBasic, I'd switch to SX/B - which Parallax offers as a free download. An SX processor (a PIC clone running at a faster clock rate) running at 75 MIPS will cost you $3.50 http://www.parallax.com/sx/index.asp . A development board will cost you $10 and the SX-...
by Forrest
Fri Oct 20, 2006 5:38 pm
Forum: General Discussion
Topic: Radio Shack fires person with experience in Electronics
Replies: 23
Views: 7564

Robert,

These prototype boards look identical to the Radio Shack versions - and they're cheaper (I haven't tried them myself):

http://www.elexp.com/pro_pb11.htm

http://www.elexp.com/pro_pb18.htm
by Forrest
Sun Jul 02, 2006 7:47 am
Forum: General Discussion
Topic: Another Recharge Batt Operated Device Bites the Dust
Replies: 12
Views: 3311

Check the trimmer mfg's web site for instructions on how to change the batteries. Due to government regulations - they're required to post instructions on how to dispose of rechargeable batteries in their devices.
by Forrest
Sat Jul 01, 2006 7:50 am
Forum: General Discussion
Topic: How to get started with STAMP's and Microcontrollers ?
Replies: 2
Views: 1592

A Basic Stamp and a PIC aren't the same thing. A Basic Stamp has an on-board voltage regulator, crystal, Microcontroller, EEPROM and a RS232 serial to TTL converter circuit. A PIC is just a Microcontroller. If you want something less expensive than a Stamp then check out the Parallax SX processor wi...
by Forrest
Sat Jul 01, 2006 7:31 am
Forum: General Discussion
Topic: precise location in space
Replies: 32
Views: 8999

How about a simpler solution - wireless video camera mounted on the kart, and wireless receiver and a pair of walkie talkies.
by Forrest
Sun Jan 29, 2006 8:40 pm
Forum: General Discussion
Topic: 800+ holes x3
Replies: 19
Views: 4349

Re: 800+ holes x3

My prices assume you'll need to buy a box of photo paper ($10), and a set of tungsten carbide drill bits ($10), a bottle of etchant ($7) and some PCB laminate ($3). It typically takes me 3-4 hours to image, touchup, etch, clean and drill 1 PC board.
by Forrest
Sun Jan 29, 2006 11:05 am
Forum: General Discussion
Topic: 800+ holes x3
Replies: 19
Views: 4349

Re: 800+ holes x3

The real question is how much time do you want to spend imaging, etching and drilling the PCB's? In my experience, you'll probably spend 10-15 hours to build 3 PCB's and it will probably cost $30 in materials (PCB laminate, photo paper, etchent and drill bits). By comparison, www.batchpcb.com will c...
by Forrest
Fri Dec 23, 2005 7:30 pm
Forum: General Discussion
Topic: Non Existent Items
Replies: 10
Views: 3813

Re: Non Existent Items

Hmm, it seems most of the popular items listed on HSC Electronic Supply's advertisement in Nuts and Volts never seems to be available. Case in point, I got the January issue today and saw a Sharp Color 10.4 inch LCD P/N 20784 for $14.95. I did a search on their web site - it doesn't exist. I've trie...
by Forrest
Sat Sep 17, 2005 9:48 am
Forum: General Discussion
Topic: LOL, parallax customers astounded by low quality
Replies: 5
Views: 1402

Re: LOL, parallax customers astounded by low quality

From the Parallax forum's:<p>Dear SXers: Today we launched a fabrication run for the SX Blitz (our SX programmer, sans debug). We decided to bring it back to our customers for the following reasons:<p> * Promotion for the Parallax SX product line * Low-cost entry point for experimenters and educatio...