Search found 106 matches
- Wed Nov 15, 2006 1:40 pm
- Forum: Robotics
- Topic: Brain waves control robot
- Replies: 7
- Views: 8245
- Wed Nov 08, 2006 4:54 am
- Forum: Computer Programming
- Topic: PIC oscillator frequency quite low
- Replies: 17
- Views: 13594
- Fri Oct 20, 2006 10:38 am
- Forum: Computer Programming
- Topic: basic code what am I missing? IF ADC is => increase PWM
- Replies: 46
- Views: 42798
What is the difference between a goto or gosub statement, and an interrupt? So you would recommend interrupts over gosubs? An interrupt is trigered by an external event It may be a sensor detecting something, a switch pressed, a cero crossing in the AC voltage or even a timer that reaches its prese...
- Wed Oct 18, 2006 8:11 am
- Forum: General Discussion
- Topic: satalite advice needed...
- Replies: 11
- Views: 4441
- Wed Oct 11, 2006 3:09 pm
- Forum: General Discussion
- Topic: Does this kind of counter IC even exist?
- Replies: 18
- Views: 8093
philba wrote doesn't that have the problem of not handling down shift? going from 3 to 2, for example. The CD 4029 is an UP/ DOWN counter: It has an input pin (U/D) that sets if it counts up or down. It also can count from 0 to 9 (decimal mode) or from 0 to 15 (or F if you like hexadecimal) (binary ...
- Wed Oct 11, 2006 2:58 pm
- Forum: General Discussion
- Topic: Does this kind of counter IC even exist?
- Replies: 18
- Views: 8093
- Fri Sep 22, 2006 6:33 am
- Forum: General Discussion
- Topic: A PC costs $10 per month
- Replies: 15
- Views: 6991
I have a cheap DVM with AC amps. I wired it so I can measure PC current consumption. ..... 30 watts There are two reasons that can make your measurements useless: >>> Phase angle : AC Power is V x I x Cos Fi, where Fi is the phase angle between the voltage U and the current I. >>> Waveform : cheap ...
- Thu Sep 07, 2006 6:03 am
- Forum: General Discussion
- Topic: Power transmission lines...
- Replies: 103
- Views: 57495
Externet: .....an attempt I did years ago to capture the radiation from very nearby transmission lines (~120ft overhead) trying to gather at least 1 Watt of power (24/7) from such radiation to charge a battery for a commercial radio repeater at the top of a mountain with no 115V in miles around. A b...
- Thu Aug 24, 2006 1:51 pm
- Forum: General Discussion
- Topic: Another ICL7107 & LM34 question
- Replies: 24
- Views: 10647
In the data sheet that Chris has posted I see that the LM 34 outputs 0 V at 0°F (with a pull down to -V), so you don't need to add offset . (I made a mistake supposing that the LM 34 behaved identically to it's centigrade counterpart (LM 35??), which has an output proportional to the absolute tempe...
- Thu Aug 24, 2006 6:20 am
- Forum: General Discussion
- Topic: Another ICL7107 & LM34 question
- Replies: 24
- Views: 10647
The LM 34 outputs some voltage at 0°F, so you must substract that voltage (offset) in order to read 0°. You may do that with an op amp (summing amplifier, gain = 1), imputting some of the reference voltage to the - (negative) input with a voltage divider. Adjusting that voltage divider (second cal...
- Thu Aug 24, 2006 5:34 am
- Forum: General Discussion
- Topic: Another ICL7107 & LM34 question
- Replies: 24
- Views: 10647
- Tue Aug 22, 2006 10:20 am
- Forum: General Discussion
- Topic: Scanning mechanism
- Replies: 11
- Views: 5483
If you allow some time / distance for the device to accelerate (and decelerate), I think that Engineer1138's idea will result in a smoother movement: Just use a regular DC motor with a gear train or belt reduction to drive it, then the only control you need is a limit switch at the end of travel As ...
- Fri Aug 18, 2006 11:03 am
- Forum: General Discussion
- Topic: Water as a fuel.... again.
- Replies: 14
- Views: 5677
- Fri Aug 04, 2006 10:09 am
- Forum: General Discussion
- Topic: Invisible infrared lamps...
- Replies: 30
- Views: 11234
- Thu Jul 06, 2006 3:42 pm
- Forum: General Discussion
- Topic: another capacitor question???
- Replies: 50
- Views: 22071