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.
Search found 11 matches
- Mon Jun 17, 2002 12:47 pm
- Forum: General Discussion
- Topic: tricky dc voltage problem
- Replies: 7
- Views: 4367
- Wed Jun 05, 2002 6:42 am
- Forum: General Discussion
- Topic: Getting started programming microcontrollers
- Replies: 14
- Views: 9410
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
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
- Tue Jun 04, 2002 2:39 pm
- Forum: Robotics
- Topic: Robot Soccer!
- Replies: 1
- Views: 2858
Robot Soccer!
Did you enjoy the international robotic
World Cup that was broadcast on PBS?
World Cup that was broadcast on PBS?
- Tue Jun 04, 2002 2:22 pm
- Forum: General Discussion
- Topic: Getting started programming microcontrollers
- Replies: 14
- Views: 9410
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 ...
- Mon May 20, 2002 9:45 am
- Forum: General Discussion
- Topic: GPS Devices To Track Cars
- Replies: 8
- Views: 5548
Re: GPS Devices To Track Cars
That suggestion of Lo-Jack sounds the best.
- Mon May 20, 2002 9:43 am
- Forum: General Discussion
- Topic: GPS Devices To Track Cars
- Replies: 8
- Views: 5548
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.
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.
- Wed Apr 17, 2002 2:19 pm
- Forum: General Discussion
- Topic: crystal radio
- Replies: 3
- Views: 3127
Re: crystal radio
It's so simple, I doubt that you'll even
need a schmematic. Try old children's books on
electronics.
need a schmematic. Try old children's books on
electronics.
- Wed Apr 17, 2002 6:52 am
- Forum: General Discussion
- Topic: Battery-Powered Radio Transmitter?
- Replies: 4
- Views: 3639
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.
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.
- Tue Apr 16, 2002 10:00 am
- Forum: General Discussion
- Topic: Battery-Powered Radio Transmitter?
- Replies: 4
- Views: 3639
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.
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.
- Mon Apr 15, 2002 2:33 pm
- Forum: General Discussion
- Topic: Solar Fan
- Replies: 13
- Views: 7703
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.
For a little, personal fan, you could just hook
up a solar cell to a toy airplane. Probably costs
just a few bucks.
- Mon Apr 15, 2002 7:00 am
- Forum: General Discussion
- Topic: Elapsed Timer
- Replies: 3
- Views: 3361
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.
to use ultrasonic range-sensors (A good choice is the Polaroid Kit, $50 from Wirz.com), and then
tie them into a stopwatch chip.