Search found 218 matches
- Wed Sep 03, 2008 6:21 am
- Forum: General Discussion
- Topic: 9.6 volt dc @1-2amp adapter for 12volt auto application
- Replies: 3
- Views: 2330
- Tue Aug 19, 2008 1:35 pm
- Forum: General Discussion
- Topic: 7 Segment Displays and Luminous Intensity
- Replies: 3
- Views: 2366
Hi there Ken, Oh that's interesting. That suggests that a white color will appear brighter to the human eye than a red color. In this case, you can use my comparative intensity measuring instrument (can be huild at home for almost no cost at all) to compare the white to the red and determine exactl...
- Fri Aug 15, 2008 5:45 am
- Forum: General Discussion
- Topic: 7 Segment Displays and Luminous Intensity
- Replies: 3
- Views: 2366
Hello MrAl, I have not purchased any of the blue segment displays. You have an interesting question. I am working on a project that I want to put red LED's in series with white LED's. As you know the forward current in the LED affects the luminous intensity. I connected one red and one white LED of ...
- Sat Aug 09, 2008 7:25 pm
- Forum: General Discussion
- Topic: Help on photoresistor - how to reverse?
- Replies: 9
- Views: 5434
I built a digital clock with a clock chip (NTE2061). My displays are 4 inch 7 segment that uses about 12V for the displays. The display has its own regulator. I used a photoresistor to sense ambient lighting, and when the room gets darker the voltage to the displays is decreased. I used an op amp wi...
- Tue Jul 08, 2008 2:46 pm
- Forum: General Discussion
- Topic: Easily assembled single in-line connector
- Replies: 22
- Views: 10849
You might want to consider the MTA series by TYCO(AMP) A digikey part # is A30994-ND. I have used a lot of similar ones that used to be made by Panduit. They were CT100f22-XX. I still have some and the manual insertion tool. The CT100F28-XX is for ribbon cable. 28 guage wire. The FXX is the wire siz...
- Tue Jun 10, 2008 6:11 am
- Forum: General Discussion
- Topic: LED'S as indicator lights on 110 volt a.c.
- Replies: 11
- Views: 5303
- Sat May 03, 2008 1:44 am
- Forum: General Discussion
- Topic: Numbers
- Replies: 22
- Views: 8716
This bring brings up something I have always maintained about the AM radio detector. Most explain the AM radio detector as a simple rectifier. I think it is a mixer, that is mixing the carrier and one of the sidebands to get the difference. What confirms this to me is in SSB reception the carrier is...
- Thu Apr 24, 2008 7:05 am
- Forum: General Discussion
- Topic: Blue transfer paper
- Replies: 21
- Views: 8606
I think having the board really clean is the key. I do my boards with a different process. I use positive sensitized boards and create my artwork and print the pattern on a clear transparancy. I found an inkjet printer that works excellent(Epson R200). I expose the boards, develop,etch,drill and tin...
- Tue Apr 08, 2008 7:53 pm
- Forum: General Discussion
- Topic: Miniature Numeric Display - Is it possible?
- Replies: 10
- Views: 5714
Re: Miniature Numeric Display - Is it possible?
I'm trying to find a way to make a small numeric display device with at least three digits, ideally five, to display numbers in increments of 50 (or 5 with a smaller display). Display would be on top, with tiny buttons on the sides. Four buttons: +50, -50, +1000, -1000 with on/off. Size would have ...
- Fri Apr 04, 2008 6:16 pm
- Forum: General Discussion
- Topic: Front Panels
- Replies: 23
- Views: 10322
- Sat Mar 29, 2008 5:54 am
- Forum: Up For Grabs
- Topic: LA2730 Dolby B-type noise reduction system
- Replies: 3
- Views: 5297
- Sat Mar 22, 2008 7:48 am
- Forum: Up For Grabs
- Topic: LA2730 Dolby B-type noise reduction system
- Replies: 3
- Views: 5297
I received a PM over month ago regarding these IC's. At the time of the personal message exchange I had lost track of the IC's. I thought I had discarded them, but I just found them. I have lost the personal messages so they are still available. All I remember was that the person that wanted them wa...
- Sun Mar 16, 2008 8:32 am
- Forum: General Discussion
- Topic: Happy Pi Day!!
- Replies: 8
- Views: 4863
- Thu Jan 31, 2008 8:21 pm
- Forum: General Discussion
- Topic: Primecell
- Replies: 13
- Views: 6001
I used to work in a independant electronic distributor that has a value added department. In that department they rebuild battery packs. One reason that tabs are spot welded to ni-cad and nickle-metal hydride cells is that the soldering temperatures can damage the rubber seals on near the + terminal...
- Tue Jan 15, 2008 7:53 pm
- Forum: General Discussion
- Topic: Ponder this for the new year...
- Replies: 16
- Views: 7402
I honestly believe rf transmission is about the most efficient transfer of energy I can think of. An area that has truly amazed me is skip zone foot print for short wave. Wether it be long skip or short skip. Let me explain. I am an active amateur radio operator(ham). I check in to a net on 40 meter...