Search found 30 matches

by Lin Farquhar
Thu Sep 02, 2004 4:32 am
Forum: General Discussion
Topic: Hints for a rookie writer?
Replies: 34
Views: 6955

Re: Hints for a rookie writer?

You could learn to spell hobbyists for starters :)
by Lin Farquhar
Fri Aug 27, 2004 6:11 am
Forum: General Discussion
Topic: 12C509 programming
Replies: 23
Views: 2997

Re: 12C509 programming

check out rev-ed.co.uk their PicAxe system is a bootstrapped PIC, programmable in BASIC. Software is a free download with full tutorials. Programming hardware doesn't come much simpler than 2 resistors and a D9 plug. I have no connection with Rev-ed, just a satisfied user, and yes, I can program pic...
by Lin Farquhar
Fri Aug 27, 2004 6:00 am
Forum: General Discussion
Topic: Need Simple Clock Design
Replies: 1
Views: 456

Re: Need Simple Clock Design

Silicon Chip magazine have something you may be able to adapt. Check
http://siliconchip.com.au/cms/A_101797/article.html
by Lin Farquhar
Wed Aug 11, 2004 10:15 am
Forum: Robotics
Topic: root locus diagram
Replies: 10
Views: 4129

Re: root locus diagram

just for the record, re the first computer, ENIGMA etc, have a look at
http://www.picotech.com/applications/colossus.html
Sorry guys, it wasn't ENIAC.
by Lin Farquhar
Wed Aug 11, 2004 9:48 am
Forum: General Discussion
Topic: AC motor control
Replies: 1
Views: 658

Re: AC motor control

presuming you want to speed control your lathe, no way home-brew unless you change to a DC or universal motor. Every lathe I have used, metal or wood, uses an induction motor. The only way to control these is with a variable frequency controller. The complexity, parts availability and safety issues ...
by Lin Farquhar
Wed Aug 11, 2004 9:32 am
Forum: General Discussion
Topic: Servo Questions
Replies: 9
Views: 1757

Re: Servo Questions

check out rev-ed.co.uk They supply a range of PicAxe chips which are bootstrapped PICs, programmable in BASIC. Software is a free download with full tutorials. Programming hardware is 2 resistors and a D9 plug out of your serial port. The 'basic BASIC' language includes a 'servo' one-line command fo...
by Lin Farquhar
Wed Aug 11, 2004 8:58 am
Forum: General Discussion
Topic: LED Sequencing
Replies: 10
Views: 1441

Re: LED Sequencing

Have a look at
rev-ed.co.uk
They supply a bootstrapped PIC chip series, programmable in BASIC. Software is a free download, and the programmer is 2 resistors and a D9 plug outta your serial port. Full tutorials are provided with the software, and the chips will drive leds directly.
Rgds, Lin
by Lin Farquhar
Wed Aug 11, 2004 8:50 am
Forum: General Discussion
Topic: DC to AC, low voltage, high amperage.
Replies: 5
Views: 906

Re: DC to AC, low voltage, high amperage.

Agree, in part, with what Chris sez above but best advice is forget it and buy an AC HF TIG. It aint that simple. When welding aluminium, the positive half cycle cleans the oxide film from the metal, the negative half cycle provides the heat into the parent metal and filler wire. Get the balance wro...
by Lin Farquhar
Wed Aug 11, 2004 7:01 am
Forum: General Discussion
Topic: Reversing Rotation of 115V Table Saw Motor
Replies: 19
Views: 3210

Re: Reversing Rotation of 115V Table Saw Motor

Along the lines of Ed B's suggestion, take a look at
http://www.homemetalshopclub.org/news/sep01/sep01.html
Rgds, Lin
by Lin Farquhar
Wed Aug 04, 2004 8:33 am
Forum: General Discussion
Topic: RS-232 control of light bulb
Replies: 10
Views: 1395

Re: RS-232 control of light bulb

You really married to the serial port? If not, just use the parallel port. You've got 8 data lines dedicated to going click-clack. Use a ULN2803 darlington driver to pick off the signal and drive a relay.
by Lin Farquhar
Wed Aug 04, 2004 8:20 am
Forum: General Discussion
Topic: solar tracker
Replies: 2
Views: 794

Re: solar tracker

Best advice is, forget it. The power costs of driving an alt/az mount outweigh any advantage gained. Having said that, I've had success using 2 leds as sensor elements, op-amp comparator and feed the OP to a simple transistor switch or an H-bridge controller. Not being hypocrytical here ,I was using...
by Lin Farquhar
Wed Aug 04, 2004 7:13 am
Forum: General Discussion
Topic: P.C.Board design
Replies: 18
Views: 2675

Re: P.C.Board design

Re cutting fibreglass PCB, I use 5" metal cut-off discs in an angle grinder. These discs are only 1MM thick and I also use em for cutting stainless steel, they're tough! Inox is the brand commonly available here in Oz. Sorry if this seems like a smartarse reply, but consider it. A little ingenuity j...
by Lin Farquhar
Thu Feb 12, 2004 10:05 am
Forum: Robotics
Topic: computer-moved levers and fake digital info (long)
Replies: 5
Views: 2592

Re: computer-moved levers and fake digital info (long)

Marc, you are speaking my language. I have an old XT (yes with 5 1/4" floppy drive) doing the sorta stuff of which you speak. Too long to go into here, but if you'd like to leave a personal message, I'll get back to you with as many details as you like.
by Lin Farquhar
Thu Feb 12, 2004 9:54 am
Forum: General Discussion
Topic: Intro to Microcontrollers HELP
Replies: 8
Views: 1503

Re: Intro to Microcontrollers HELP

PS, I've just googled "picaxe code" and come up with 429 hits :)
by Lin Farquhar
Thu Feb 12, 2004 9:48 am
Forum: General Discussion
Topic: Intro to Microcontrollers HELP
Replies: 8
Views: 1503

Re: Intro to Microcontrollers HELP

Yup, me again. Yes I did it the hard way first, PIC assembler etc. When I came across the picaxe system I damn near wept! It is cheap, not much more than the original PIC chips. It is so easy for the beginner (and pro). The software is free and well supported. The programming "hardware" is about $5 ...