Search found 124 matches

by Bern
Wed Dec 27, 2006 10:17 pm
Forum: General Discussion
Topic: Desiccant ?
Replies: 6
Views: 1749

Desiccant ?

Where is a good place to get desiccant? Can you buy the material cheap, and make your own packages? What is a good way to drive out the moisture, so they can be used again? Thanks
by Bern
Thu Nov 16, 2006 9:17 pm
Forum: General Discussion
Topic: Amperage, DC vs. AC
Replies: 4
Views: 1794

Amperage, DC vs. AC

I am planning on running DC through a standard house type circuit breaker. How much will the current carrying capacity go up because of the DC over AC? There are some numbers available comparing DC to AC when working with current capacity of wires, do those same ratios work with breakers? Example, w...
by Bern
Sat Nov 11, 2006 9:10 am
Forum: General Discussion
Topic: charging a battery without electrical connections
Replies: 13
Views: 2697

When you were testing using induction, what frequency were you using? If you were using 60 cycle, I would suggest you try a higher frequency; it should increase coupling, and therefore efficiency. With the inside self-righting capability, you will know where the inside coil is, so position the drive...
by Bern
Sat Oct 28, 2006 9:54 pm
Forum: General Discussion
Topic: Barking Dog
Replies: 32
Views: 6226

Hey, guys, I’m just looking for some thoughts on how to discourage the neighbors’ dog from barking, hour after hour for apparently no reason. Don’t want to “hurtâ€
by Bern
Thu Oct 26, 2006 11:34 pm
Forum: General Discussion
Topic: Barking Dog
Replies: 32
Views: 6226

Well, I don’t want to hit him with something that is going to cause pain, or something bad. I hope to cause a little discomfort for a few seconds at the time of barking. Just enough to get his attention, and maybe he will connect the discomfort with excessive barking. I figured I would have a remo...
by Bern
Thu Oct 26, 2006 1:35 pm
Forum: General Discussion
Topic: Barking Dog
Replies: 32
Views: 6226

Yes, I have talked to the owners. Their basic comment is, no, their dog does not bark, it must be the other neighbors dog. (Back to my neighbor) The dog also does a lot of barking when they are home. Their comment then is that they don’t hear it. ( They are quite elderly, and normally have the TV ...
by Bern
Wed Oct 25, 2006 9:08 pm
Forum: General Discussion
Topic: Barking Dog
Replies: 32
Views: 6226

Yes, there are a lot of piezeos out there, however I cannot find any that are rated for the type of power it sounds like I need. Those that are about an inch or inch and a half in Dia, I don’t think is what I need. But then I may be wrong about what I really need. When I hear speaker, I think abou...
by Bern
Wed Oct 25, 2006 7:26 pm
Forum: General Discussion
Topic: Barking Dog
Replies: 32
Views: 6226

It appears like I need to get a piezoelectric speaker. Any suggestions from anyone about where to get one? I have looked through some catalogs, but no luck.
by Bern
Wed Oct 25, 2006 4:13 pm
Forum: General Discussion
Topic: Barking Dog
Replies: 32
Views: 6226

Barking Dog

I read what I could find in history on barking dog problems, and it appears nothing recently. What are the latest updates on systems? Where is a good source of transducers, like speakers or piezo units for the job? Which is the best? My problem is almost every afternoon, the owners are gone for abou...
by Bern
Sun Oct 15, 2006 9:22 pm
Forum: General Discussion
Topic: Max vehicle alternator current
Replies: 6
Views: 2027

A few months ago, I had a project where I was pulling heavy current from the electrical system, and was concerned about alternator capabilities. I asked several different auto mechanics, and alternator rebuild houses, and basically was told the same story. The ratings on an alternator are peak and f...
by Bern
Sat Jul 15, 2006 6:40 pm
Forum: General Discussion
Topic: SMT, getting started
Replies: 4
Views: 1635

SMT, getting started

I have intentionally steered clear of working with SMTs, and now that bit me. I have a project where I must use SMT, and I know next to nothing about it. I need to design the circuit, do the layout, and build boards. - - - Any suggestions on how to get up to speed in a hurry? Somewhere it seems I sa...
by Bern
Tue May 30, 2006 10:06 am
Forum: General Discussion
Topic: Voltage Regulation
Replies: 12
Views: 2620

Thanks for all the inputs, everyone. I have been gone for several days, so missed a lot of the action. For this application I think I will use a combination of ideas. If I break the load into two sections with a R & C, the critical steady load and the variable load, along with your inputs, I think I...
by Bern
Thu May 25, 2006 11:33 am
Forum: General Discussion
Topic: Voltage Regulation
Replies: 12
Views: 2620

A switcher sounds like too much for what is needed. I need many of them, so money is critical. I have very little room. The whole system will be running on micro-amps, so just the control circuits in a switcher, at first, sounds undoable. ---- Thanks, and please keep all ideas coming.
by Bern
Thu May 25, 2006 11:06 am
Forum: General Discussion
Topic: pos 12 volts to split 5 volts supply?
Replies: 18
Views: 4727

Hi Dacflyer -- This may be too late, but possibly another idea to look at. I haven’t tried it, but a quick thought and scribbles on paper look like it might be worth trying. The only requirement appears that the Pos load always has to be greater than the Neg. load. ------- Take your 12 volt supply...
by Bern
Thu May 25, 2006 8:09 am
Forum: General Discussion
Topic: Voltage Regulation
Replies: 12
Views: 2620

MrAl -- Input maximum of about 10 volts, and output in the 4 to 5 volt area. Not critical, but has to stay constant with input dropping as the batteries age, and has to stay solid with changing load.