Search found 11 matches

by thomasng558
Mon Jun 17, 2002 12:47 pm
Forum: General Discussion
Topic: tricky dc voltage problem
Replies: 7
Views: 1426

Re: tricky dc voltage problem

No. An op-amp wouldn't work because of clipping.
A very stable voltage reference for the
output voltage would be a reverse-biased Zener
diode. You could then use a potentiometer (as
a voltage diver) to reduce it to the desired
voltage.
by thomasng558
Wed Jun 05, 2002 6:42 am
Forum: General Discussion
Topic: Getting started programming microcontrollers
Replies: 14
Views: 3529

Re: Getting started programming microcontrollers

Here's the data:
o Trainer Unit :
SDK-85, from urda.com
o Associated Text :
"Microprocessors and Microcontroller
Fundamentals : The 8085 and 8051 Hardware
and Software" , by William Kleitz, from
amazon.com
by thomasng558
Tue Jun 04, 2002 2:39 pm
Forum: Robotics
Topic: Robot Soccer!
Replies: 1
Views: 1443

Robot Soccer!

Did you enjoy the international robotic
World Cup that was broadcast on PBS?
by thomasng558
Tue Jun 04, 2002 2:22 pm
Forum: General Discussion
Topic: Getting started programming microcontrollers
Replies: 14
Views: 3529

Re: Getting started programming microcontrollers

There are many available microcontrollers, and many of those will do any specific application well. Rather than advocate a type vs. another, I'd suggest understanding the basics. For this, I'd suggest buying an URDA (www.udra.com) trainer SDK, for the 8055/8051. Then I'd use a text (I don't have it ...
by thomasng558
Mon May 20, 2002 9:45 am
Forum: General Discussion
Topic: GPS Devices To Track Cars
Replies: 8
Views: 1884

Re: GPS Devices To Track Cars

That suggestion of Lo-Jack sounds the best.
by thomasng558
Mon May 20, 2002 9:43 am
Forum: General Discussion
Topic: GPS Devices To Track Cars
Replies: 8
Views: 1884

Re: GPS Devices To Track Cars

GPS sounds like overkill.
Would a radio transmitter and matching
rerceiver work? They're both available, in
kit form, at www.jameco.com. $13 each, plus
postage and handling.
by thomasng558
Wed Apr 17, 2002 2:19 pm
Forum: General Discussion
Topic: crystal radio
Replies: 3
Views: 1147

Re: crystal radio

It's so simple, I doubt that you'll even
need a schmematic. Try old children's books on
electronics.
by thomasng558
Wed Apr 17, 2002 6:52 am
Forum: General Discussion
Topic: Battery-Powered Radio Transmitter?
Replies: 4
Views: 1318

Re: Battery-Powered Radio Transmitter?

Thanks all! I found a kit at a mail-order
spot, JAMECO ELECTRONICS, that sells a kit
for $12.95. Since, I work a few miles away,
I'll just order it on "will call" and save myself
the shipping charge.
by thomasng558
Tue Apr 16, 2002 10:00 am
Forum: General Discussion
Topic: Battery-Powered Radio Transmitter?
Replies: 4
Views: 1318

Battery-Powered Radio Transmitter?

I'd like a low-cost way to broadcast the
output from my portable CD player from the
AM/FM radio speakers from my car.
There is a kit that does this for $40, but
it seems pretty overpriced.
by thomasng558
Mon Apr 15, 2002 2:33 pm
Forum: General Discussion
Topic: Solar Fan
Replies: 13
Views: 3688

Re: Solar Fan

It depends on how powerful a fan you want.
For a little, personal fan, you could just hook
up a solar cell to a toy airplane. Probably costs
just a few bucks.
by thomasng558
Mon Apr 15, 2002 7:00 am
Forum: General Discussion
Topic: Elapsed Timer
Replies: 3
Views: 1378

Re: Elapsed Timer

If economy is a consideratrion, you may wish
to use ultrasonic range-sensors (A good choice is the Polaroid Kit, $50 from Wirz.com), and then
tie them into a stopwatch chip.