Search found 124 matches

by Bern
Tue Aug 16, 2005 5:05 pm
Forum: General Discussion
Topic: Dew Point
Replies: 25
Views: 4440

Re: Dew Point

Thanks, Chris. It got me thinking, but I am not sure how those work. Do they sense the point when condensation forms, which would be the dew point of the sensor temperature, or due they somehow sense the approach of dew point? ----- I need to turn a fan on/off, blowing air through a small enclosure....
by Bern
Tue Aug 16, 2005 4:07 pm
Forum: General Discussion
Topic: Dew Point
Replies: 25
Views: 4440

Dew Point

I am looking for a transducer, or a method to measure the dew point. Do to the use; I don’t want to use the method of measuring RH and temperature, and then using look-up tables or computation. Needs to be low power, simple, and inexpensive. Anything available, or any ideas? Thanks
by Bern
Sat Apr 09, 2005 9:15 pm
Forum: General Discussion
Topic: D. Recorder,
Replies: 8
Views: 1688

Re: D. Recorder,

Miguel, thanks, but I guess I don’t totally follow you. If I record on my computer system, it sounds like I would then have to move it to the player somehow. What I am looking for, is a small recorder/playback system. Maybe that is what you have in mind, and I just am not familiar enough, with avail...
by Bern
Sat Apr 09, 2005 5:45 pm
Forum: General Discussion
Topic: 3X4 Keypad and NTE1690 DTMF Encoder
Replies: 1
Views: 782

Re: 3X4 Keypad and NTE1690 DTMF Encoder

It has been a long time, but as I remember when I was working with telephone key pads, they were available wired both ways. Some connected the R & C together, while other types had a common line that connected to R & C.
by Bern
Sat Apr 09, 2005 5:40 pm
Forum: General Discussion
Topic: D. Recorder,
Replies: 8
Views: 1688

D. Recorder,

I have a need for a digital recorder. I want several short (4 to 35 sec.) recordings that can be selected at random. I need to be able to push one of several buttons, and have that selection only, play. The selection button can be either on the recorder, or remotely wired. Anybody ever do this, or h...
by Bern
Sat Mar 26, 2005 11:43 am
Forum: Robotics
Topic: PWM controllers
Replies: 2
Views: 2886

PWM controllers

I need PWM control for a motor, (up to 36V, 65A) continuous use. I want to use an analog signal for control, very basic with no ramp ups, down, direction control, etc. -- I planned on building it myself, however I now understand there are commercial ones available at very reasonable pricing. Looking...
by Bern
Sat Mar 26, 2005 11:42 am
Forum: General Discussion
Topic: PWM controllers
Replies: 1
Views: 582

PWM controllers

I need PWM control for a motor, (up to 36V, 65A) continuous use. I want to use an analog signal for control, very basic with no ramp ups, down, direction control, etc. -- I planned on building it myself, however I now understand there are commercial ones available at very reasonable pricing. Looking...
by Bern
Tue Jan 25, 2005 6:30 pm
Forum: General Discussion
Topic: Sound Recording Chip
Replies: 2
Views: 994

Sound Recording Chip

I want to record several short sound bits (up to about 30 seconds) and be able to selectively play them back. What are some of the best ways of doing this? Where is a good place to get the sound chips? Pricing information? Etc. Thanks
by Bern
Fri Dec 10, 2004 11:13 am
Forum: General Discussion
Topic: Al Williams, Book
Replies: 10
Views: 2766

Re: Al Williams, Book

Thanks Al, - - - <p>Received the new CD. Everythings up and running. Looking good. Very glad I invested in your book, even if it did have a little hick-up.
by Bern
Thu Dec 02, 2004 7:18 pm
Forum: General Discussion
Topic: Drill Bits
Replies: 15
Views: 3229

Drill Bits

Help refresh my mind, guys. I know I have seen small drill bits (PC board hole sizes) someplace, but now I can’t find them. I think they were in one of the surplus catalogs. Where do you get your best buys? Thanks
by Bern
Tue Nov 30, 2004 3:56 pm
Forum: General Discussion
Topic: Al Williams, Book
Replies: 10
Views: 2766

Re: Al Williams, Book

Thanks to both of you. If you think the question is dumb, then I am the really dumb one, because I have no idea. Reading the reply from Mike, it must be CD-R, because it is green. I bought this system in Feb. of ’02. Other than that I don’t know what it can or cannot read. I have never had problems ...
by Bern
Tue Nov 30, 2004 2:06 pm
Forum: General Discussion
Topic: Al Williams, Book
Replies: 10
Views: 2766

Al Williams, Book

I bought the book, "Build Your Own Printed Circuit Board", by Al Williams. When I try to load the CD that came with the book, nothing happens. I go to the CD drive, and it says it can’t find it. Never had this problem before. Put in another CD, and it came up OK. Apparently my system is OK. Prefer n...
by Bern
Thu Nov 25, 2004 7:07 pm
Forum: General Discussion
Topic: Website on batteries ???
Replies: 5
Views: 1249

Re: Website on batteries ???

Some sites to check; A LOT of good information. ----------- http://www.mrsharkey.com/busbarn/electrics/chapt3.htm-----------------http://www.lifelinebatteries.com/graphs.asp-------------- http://www.windsun.com/Batteries/Battery_FAQ.htm------------ http://www.trojan-battery.com/customercare_batterym...
by Bern
Thu Nov 25, 2004 6:54 pm
Forum: General Discussion
Topic: DIY circuit boards
Replies: 11
Views: 2485

Re: DIY circuit boards

Thanks guys. I just went ahead and ordered Al Williams book. I hope it can lead me by the hand, and is worth the price.
by Bern
Tue Nov 23, 2004 5:14 pm
Forum: General Discussion
Topic: DIY circuit boards
Replies: 11
Views: 2485

DIY circuit boards

Please bear with me, but after reading a lot on different board design software, and methods, I am still not sure what would be the best way for me to go. I want to be able to lay out small, single and double-sided boards. I want to be able to make my own boards for testing, or where one or two are ...