Search found 2970 matches
- Fri Aug 13, 2004 11:39 am
- Forum: General Discussion
- Topic: Build to order (or swap)
- Replies: 24
- Views: 9782
Re: Build to order (or swap)
Selling Kits is a delicate balance between cost and features. Most of us are aware that a gadget in kit form cost far more than the equivelent mass produced item due to the cost of kitting, labeling and producing an instruction sheet (nevermind supporting your customers)for such a low volume market....
- Tue Aug 10, 2004 3:25 pm
- Forum: General Discussion
- Topic: Build to order (or swap)
- Replies: 24
- Views: 9782
Re: Build to order (or swap)
Usually, I've seen others post such requests right here in this section of the BBS and such requests have been warmly recieved. Though, I don't know if anyone ever has in fact done a design for barter or money due to a hookup here. <p>So long as these requests come at the same pace, I don't see a ne...
- Wed Aug 04, 2004 1:46 pm
- Forum: General Discussion
- Topic: Spice Question
- Replies: 3
- Views: 1623
Re: Spice Question
For low current and used as an interconnect, use a plain resistor model. For higher current used as a heating element it would have to be a resistor that takes into account self heating and temperature coefficient.<p>I is a function of R and V, R is a function of Temp, Temp is a function of I, R (an...
- Tue Aug 03, 2004 10:29 am
- Forum: General Discussion
- Topic: 11.5Vdc / 12Vdc to 12.5Vdc/13Vdc
- Replies: 16
- Views: 7991
Re: 11.5Vdc / 12Vdc to 12.5Vdc/13Vdc
The detail about the end application helps. I was beginning to think that you did know about cars but like the fuel pump, had a bottleneck in electrical ideas.<p>Increasing the wire gague (size) may reduce a voltage drop if the current in the wire is very high. Not sure what kind of current a fuel p...
- Mon Aug 02, 2004 3:40 pm
- Forum: General Discussion
- Topic: 11.5Vdc / 12Vdc to 12.5Vdc/13Vdc
- Replies: 16
- Views: 7991
Re: 11.5Vdc / 12Vdc to 12.5Vdc/13Vdc
Anything made to work in a car should already work equally well at both those voltages. 11.5 to 12V is what you get from the battery when the car is off and 13 to 13.5V is what you get from the alternator when the car is running.<p>Increasing DC voltage a small amount is suprisingly technically diff...
- Fri Jul 30, 2004 3:16 pm
- Forum: General Discussion
- Topic: P.C.Board design
- Replies: 18
- Views: 8263
Re: P.C.Board design
Are you looking for a recommendation for CAD software or on an inexpensive PCB fab<p> www.pcdandm.com is a trade magazine with links from its website for vendors. Click on the current advertizers link<p>I use www.pcbnet.com because I can get 5 two layer boards delivered for $100 full spec, standatd ...
- Fri Jul 30, 2004 2:38 pm
- Forum: General Discussion
- Topic: LED Sequencing
- Replies: 10
- Views: 4369
Re: LED Sequencing
An LED sequencer can be made with a counter chip or a bunch of flip flops (for a little more control)<p>Basically the chip is clocked by an oscillator (can be a 555 circuit) which causes the output pins to change state in the designed sequence. Each output pin drives 1 LED. <p>By designing a counter...
- Fri Jul 30, 2004 2:20 pm
- Forum: General Discussion
- Topic: electronic jobs for people with disabilities
- Replies: 6
- Views: 2454
Re: electronic jobs for people with disabilities
Most tasks in electronics require little mobility. I spend most of my day at the PC doing CAD, customer support, searching for and researching parts on the web and lurking in this forum. When not in front of a computer, I may be seated at a bench assembling prototypes or making measurements.<p>Only ...
- Fri Jul 30, 2004 2:01 pm
- Forum: General Discussion
- Topic: another dumb LED question.
- Replies: 5
- Views: 2446
Re: another dumb LED question.
In such a simple circuit, it makes no difference whatsoever the order the LED and associated dropping resistor.<p>In addition to using ohm law, you should also add up all the voltage drops in the loop, they should add to 0 and all the currents in and out of any node should also be 0. These three con...
- Thu Jul 22, 2004 3:05 pm
- Forum: General Discussion
- Topic: Board usage
- Replies: 4
- Views: 2078
Re: Board usage
Only the rules of polite society apply here.<p>In my opinion, any subject or question commercial or private within the scope of the magazine's subject is fair game here. (and a bit more)<p>I also feel the posting of links that are ultimately commercial in nature is fine so long as the link was liste...
- Tue Jul 20, 2004 12:11 pm
- Forum: General Discussion
- Topic: Temperature controlled home brew
- Replies: 18
- Views: 7959
Re: Temperature controlled home brew
Any temp controller has inputs for one or more thermo couples, outputs to control the load (usually a relay) and a way to power it.<p>Look for one that works at 110V to power it up and use a relay with 110V coil and 220V rated contacts. This will alleviate you from needing a DC supply to power it an...
- Tue Jul 20, 2004 11:48 am
- Forum: General Discussion
- Topic: Public art piece_ Peekskill festival (looking 4 cheap w
- Replies: 2
- Views: 2069
Re: Public art piece_ Peekskill festival (looking 4 cheap w
synesthesia right? <p>Do you want to dimm all of the lights at once or dim each light individually acording to your program.<p>The first route is easy, you just need to put a variable resistor or dimmer on the common return line for all the bulbs. (this is really cheap). Note that most dimmer switch...
- Fri Jul 16, 2004 12:45 pm
- Forum: General Discussion
- Topic: Reducing power surge on AC adapter
- Replies: 8
- Views: 4309
Re: Reducing power surge on AC adapter
You say the inverter circuit protection trips upon power up of the AC powered switching supply you have plugged into it. Does it power the PC ok after it is powered up or have you ever gotten that far.<p>If the Inverter were starved then you could put a cap in parallel with the DC input but that wou...
- Fri Jul 16, 2004 12:33 pm
- Forum: General Discussion
- Topic: Water Filter
- Replies: 3
- Views: 1972
Re: Water Filter
Go the home depot and look for a filter cartrage. The one I am thinking of is about 18" and 2" or 3" in diameter (a guess from memory). Use an activated charcoal filter for taste and oders. If it were silty you would need a paper filter first but this is not nessary here. The filters ...
- Fri Jul 16, 2004 12:20 pm
- Forum: General Discussion
- Topic: Moisture Sensor
- Replies: 9
- Views: 4280
Re: Moisture Sensor
I assume you mean a non-contact sensor suitable for use turning on the windshield wipers. I think it has something to do with IR light and how light reflects differently off wet and dry glass.<p>see auto.howstuffworks.com/wiper4.htm and the associated PDF link on the same page.<p>TRW makes a sensor ...