Search found 2801 matches

by haklesup
Mon May 12, 2003 11:00 am
Forum: General Discussion
Topic: Car stereo buzz problem
Replies: 8
Views: 1703

Re: Car stereo buzz problem

Buzzing is one of the most common problems in car sterio installations. especially when connecting a head unit to an amplifier, in your case it is a CD and the amplifier is the head unit. <p>In any case, it sounds like ground loop noise. You can either make absolutly sure that the CD power supply (c...
by haklesup
Tue May 06, 2003 10:15 pm
Forum: General Discussion
Topic: Micro electronics, micro wiring, terminals...?
Replies: 1
Views: 588

Re: Micro electronics, micro wiring, terminals...?

How many conductors and what is the lead pitch (how far apart are the pins) on this "Flex Cable"?<p>You can find these cables in lots of computer equipment like printers and CD drives but if the number of conductors and lead pitch don't match up then it would be difficult to mate them. YOu can find ...
by haklesup
Tue May 06, 2003 7:51 pm
Forum: General Discussion
Topic: Transistor power rating(newbie)
Replies: 1
Views: 520

Re: Transistor power rating(newbie)

It has to do with the voltage drop across the xistor and the load. Take this example:<p>Imagine a transiator (E- GND) in series with a coil with a 120ohm resistance. (C to load, B to control ckt).<p>If the power in the transistor is P=Ic*Vce. Bias it at 3V and 100mA (whatever hypothetical xistor you...
by haklesup
Mon May 05, 2003 12:52 pm
Forum: General Discussion
Topic: Moving cable sensing
Replies: 3
Views: 701

Re: Moving cable sensing

It's difficult to tell how much contrast two colors will have when viewed in IR light. The paint you used may not be good enough. Try glitter nail polish or some other paint with high reflective qualities. Or use a carbon black for high contrast. Use a lighter to make soot on a piece of Al foil then...
by haklesup
Fri May 02, 2003 12:20 pm
Forum: General Discussion
Topic: Moving cable sensing
Replies: 3
Views: 701

Re: Moving cable sensing

I think you are on the right track by putting black and white contrasting bands on the cord. This is essentially a linear optical encoder.<p>The IR LED/Detector depends on line of sight between the two parts (transmitted light). Since the cord blocks the beam all the time, it would not work. You nee...
by haklesup
Thu May 01, 2003 3:24 pm
Forum: General Discussion
Topic: Vacucoating?
Replies: 5
Views: 1096

Re: Vacucoating?

What you want is called "Potting Compound" search for it or "Silicone Potting Compound" on the web and you will find many references. <p>For electronics you want one with low electrical conductivity (some RTV like the tool dip may have additives that might increase leakage)and high thermal conductiv...
by haklesup
Tue Apr 29, 2003 11:25 am
Forum: General Discussion
Topic: S-Video
Replies: 3
Views: 740

Re: S-Video

S-Video is Video only. It is not an A/V cable. On a high end system, you might also have the choice of Digital optical Audio or Digital Coax Audio in addition to the RCA inputs.
by haklesup
Tue Apr 29, 2003 10:33 am
Forum: General Discussion
Topic: idiot question
Replies: 2
Views: 656

Re: idiot question

Digital cable is not really digital, The Video and in most cases the Audio is still Analog. What is Digital is the services like the on screen guide and the ability for them to charge you more money for more pay stations. The higher channel numbers are for for the most part just like the others but ...
by haklesup
Tue Apr 29, 2003 10:10 am
Forum: General Discussion
Topic: Temperature readings into a PC?
Replies: 16
Views: 2817

Re: Temperature readings into a PC?

Many motherboards have one or two temperature sensors built right in and used to monitor HDD or CPU temp etc. It wouldn't be too hard to extend the wires on one of these sensors and put it outside the box.<p>The MB should have a utility for looking at the temp as well as other stats about the PC (fa...
by haklesup
Fri Apr 25, 2003 11:55 am
Forum: General Discussion
Topic: audio frequency oscillator w/ meter
Replies: 1
Views: 632

Re: audio frequency oscillator w/ meter

Don't know about a kit but a search for "Function Generator" on ebay showed lots of used equipment in the $5 to $50 range. A function generator would be more useful in the long run because you can make more than sine waves. Some have displays and others just have a calibrated dial. You may want one ...
by haklesup
Tue Apr 22, 2003 1:22 pm
Forum: General Discussion
Topic: ¿ A very different approach for circuit boards ?
Replies: 14
Views: 2633

Re: ¿ A very different approach for circuit boards ?

Conductive Ink printed on a hard paper substrate with ICs bonded directly was supposed to form the basis of really cheap disposable cell phones. Even though I saw a prototype on TV, I have never seen a commercial product for sale anywhere that uses this PWB technology. <p>What ever happened to that?...
by haklesup
Wed Apr 16, 2003 6:41 pm
Forum: General Discussion
Topic: SP8685 IC----- 500Mhz counter
Replies: 2
Views: 854

Re: SP8685 IC----- 500Mhz counter

Do you know who made the IC? (is it Plessy). Are there any other markings on the device. Put "Obsolete Semiconductors" in a search engine to come up with distributors who specialize in out of production devices. <p>I found it on the ubid.com. They list about a dozen distributors with quantity. Searc...
by haklesup
Mon Apr 14, 2003 7:28 pm
Forum: General Discussion
Topic: Composite Video Output
Replies: 6
Views: 990

Re: Composite Video Output

Could be pretty useful but at $70 it is just on the line of being worth it since you can get a small TV with AV inputs for about the same price. If the price does come down a bit (it is likely to) then I may buy one too.
by haklesup
Mon Apr 14, 2003 5:44 pm
Forum: General Discussion
Topic: Electrical Engineering as a College Major and Career
Replies: 11
Views: 1969

Re: Electrical Engineering as a College Major and Career

A career is sort of an evolutionary process. Don't worry so much about exactly what job you will have when you get out (unless you do have a clear goal). That first job will be a function of what is available and where you live as much as it is what you want. I had to move from Baston to San Jose to...
by haklesup
Mon Apr 14, 2003 10:40 am
Forum: General Discussion
Topic: Electrical Engineering as a College Major and Career
Replies: 11
Views: 1969

Re: Electrical Engineering as a College Major and Career

Mike,<p>Although I cannot underestimate the usefulness of hands on projects for learning, fostering interest and lets not forget the simple pleasure of a hobby, there are plenty of EE disciplines that require no soldering skills at all.<p>Take for example the Semiconductor industry which dominates t...