Search found 2801 matches

by haklesup
Thu Apr 10, 2003 2:13 pm
Forum: General Discussion
Topic: consumer alarm clock displays
Replies: 2
Views: 733

Re: consumer alarm clock displays

That LCD Display looks pretty custom. It has lots of details. Dosn't seem that anyone would offer it as a generic component. It's more likly that all those retail outlets buy the same or similar clock from the same OEM who will print any name on the base you pay them to (called VAR Value Added Retai...
by haklesup
Thu Apr 03, 2003 12:17 pm
Forum: General Discussion
Topic: Question for any TV tech out there
Replies: 6
Views: 1107

Re: Question for any TV tech out there

Sounds like a ground loop picking up noise from a circuit inside the set. There are many sources of noise in a TV. Look for unattached shield or ground wires. Wires (especially to ground) that were added by the tech at the time of repair. Broken or cold solder connections anywhere but especially gro...
by haklesup
Wed Apr 02, 2003 10:55 am
Forum: General Discussion
Topic: Monitor temps
Replies: 10
Views: 1649

Re: Monitor temps

For off the shelf, two companies immedietly come to mind. Omega and National Instruments.<p>Omega is big in the temp sensing field. A quick look at one of their excessively thick catalogs shows a model OMB-DAQ-56 can be configured with options for 120 inputs for around $3k. It's USB, comes with SW a...
by haklesup
Tue Apr 01, 2003 7:31 pm
Forum: General Discussion
Topic: ELECTRONIC GAS SAFTY DEVICE
Replies: 6
Views: 1412

Re: ELECTRONIC GAS SAFTY DEVICE

Certainly the debate over the usefulness of patents rages on. The only ones guaranteed to make money off a patent is the lawyer (no wonder he didn't like the article)<p>Since you already went through the trouble of getting a Utility Patent, your choices are: 1.Become an OEM and make it and sell it y...
by haklesup
Thu Mar 20, 2003 1:06 pm
Forum: General Discussion
Topic: stupid question
Replies: 1
Views: 613

Re: stupid question

Its in the Tools menu. Go down to Macro and another menu pops out where you will find a button for the VB editor or you can push Alt-F11.<p>You must have installed this option when you installed word to have all the choices.<p>Use the Help for more info. VBA for Excel and Word is a subset of VB so y...
by haklesup
Wed Mar 19, 2003 10:34 am
Forum: General Discussion
Topic: Differences in transistors
Replies: 7
Views: 1367

Re: Differences in transistors

Even within the same manufacturer, lot to lot differences exist. This is why it can be a challenge to build a differential amplifier out of discrete components. People pay a premium for matched pairs of transistors or even pairs mounted in the same package.<p>Look at the Electrical Characteristics o...
by haklesup
Tue Mar 18, 2003 5:07 pm
Forum: General Discussion
Topic: Differences in transistors
Replies: 7
Views: 1367

Re: Differences in transistors

I believe they are. Both part numbers cross reference to the same NTE rfeplacement part number www.nteinc.com/specs/100to199/pdf/nte123ap.pdf <p>the 2N prefix is a standard from JEDEC and is much more common http://www.chipdocs.com/pnsearch/search.html?okwd=MPS3904&partid=11732&ReR=GG but the MPS is...
by haklesup
Tue Mar 18, 2003 4:34 pm
Forum: General Discussion
Topic: CCD switching noise?
Replies: 3
Views: 781

Re: CCD switching noise?

The answer to your question is deeply rooted in the methodologies used to design IC chips. The noise you imagine should not exist in a proper design. <p>Much effort goes into simulating the electrical signals that are present in the circuit. The models that go into Spice and VHDL are based on the la...
by haklesup
Tue Mar 18, 2003 10:47 am
Forum: General Discussion
Topic: Telephone Jack
Replies: 11
Views: 1473

Re: Telephone Jack

What you want is a Molded Modular connector for an RJ-11 plug. The dual ones are just 2 plugs molded into the same part for convenience but there are no shared pins between them usually they are 2 seperate jacks and you may just as easily use two singles in your project. <p>Normally they (Red and Gr...
by haklesup
Mon Mar 17, 2003 4:36 pm
Forum: General Discussion
Topic: I'm new to this.
Replies: 4
Views: 985

Re: I'm new to this.

As a person new to electronics, my advice is to step back look at what others are doing (and how they are doing it), pick something of interest and create a project based on that interest.<p>There are a lot of good introductory and or general information books to get you started but depending on you...
by haklesup
Fri Mar 14, 2003 11:16 am
Forum: General Discussion
Topic: What is a Journeyman Electrician ?
Replies: 4
Views: 1145

Re: What is a Journeyman Electrician ?

That's essentially it but in addition there are classes given by the union that must be completed and a minimum number of hours that must be worked during those 4 years. It can take longer for some people. This is true of most trades. Getting work at the union hall can be a long wait these days as m...
by haklesup
Fri Mar 14, 2003 11:05 am
Forum: General Discussion
Topic: Current logging
Replies: 3
Views: 831

Re: Current logging

The control board in a UPS does most of these things. Measure Frequency, Voltage of mains and output, Load usage and a few other parameters about the battery like temperature and DC voltage as well as charge/discharge current etc. and they already have a Serial or USB interface.<p>I can't remember w...
by haklesup
Fri Mar 14, 2003 10:56 am
Forum: General Discussion
Topic: computer contol
Replies: 6
Views: 1160

Re: computer contol

A lot depends on the type of control your RC car needs. Most cheap toys are simply 4 channel on-off type transmitters. The right, left, forward and reverse channels are either on or off. this is the easier case since all you need to do is use an interface (your choice, USB, Serial, Parallel) which g...
by haklesup
Thu Mar 13, 2003 4:53 pm
Forum: General Discussion
Topic: Tips for removing residual solder?
Replies: 7
Views: 1303

Re: Tips for removing residual solder?

More precisely, the gold forms a thin intermetallic layer that is an alloy of the two metals (actually 3 or more since solder is already an alloy). The thickness of this layer depends on the grain size and excat composition of the base metal (gold or gold alloy) and the temperature it was applied et...
by haklesup
Thu Mar 13, 2003 3:35 pm
Forum: General Discussion
Topic: Tips for removing residual solder?
Replies: 7
Views: 1303

Re: Tips for removing residual solder?

Assuming the base metal is Gold (although Copper should give similar selectivity)Copper does etch more readily than Gold both are destroyed by anything with Nitric acid in it.<p>A solder etch bath can be made from 75%(by Vol) Acetic Acid and 25% (by vol) Hydrogen Peroxide (H2O2)(30%). Now that perox...