Search found 2753 matches

by haklesup
Fri Aug 30, 2002 9:42 pm
Forum: General Discussion
Topic: animal tracking transmitter
Replies: 13
Views: 2427

Re: animal tracking transmitter

Looked at the circuit, deceptively simple. Hard to say what's wrong without hands on but there are a few things I noticed.<p>1. Construction counts, especially in RF circuits. Not so much a quality issue but for example you don't want the inductors to be too close together or they could share a B fi...
by haklesup
Thu Aug 29, 2002 10:45 am
Forum: General Discussion
Topic: Suppliers
Replies: 8
Views: 1503

Re: Suppliers

I can't verify that these guys have exactly what you want but a few of my favorite surplus dealers are:<p> www.alltronics.com (San Jose) www.halted.com (San Jose) www.dalbani.com (Miami)<p>All of these have large surplus stocks only a protion of which is listed on their websites. You may have to cal...
by haklesup
Wed Aug 28, 2002 11:12 am
Forum: General Discussion
Topic: MINIATURE LINEAR ACTUATOR
Replies: 5
Views: 1185

Re: MINIATURE LINEAR ACTUATOR

I can think of two ways. A solonoid along with a lever would give you rapid action and instant release when power is removed. A slow motor with a cam attached would give you slower action and may stay open when power is removed. A simple circle with an off center pivit hole would work as a cam or yo...
by haklesup
Tue Aug 27, 2002 1:51 pm
Forum: General Discussion
Topic: Test Equipment
Replies: 1
Views: 732

Re: Test Equipment

Psosting like you have in forums like this one or general newsgroups like sci.electronics.equipment (use your outlook program to access these) will likly generate some direct interest but you will still have the difficulty of determining a fair price.<p>I have been selling testers on eBay of a few m...
by haklesup
Tue Aug 27, 2002 1:10 pm
Forum: General Discussion
Topic: Ethernet Connector
Replies: 4
Views: 899

Re: Ethernet Connector

If you lost the whole PCMCIA card then you can probably buy just about any brand to replace it. If you lost the cable or broke off the connector that goes with a card then you may have to replace the card. anyway. There not too much if you don't buy a sony exact replacement.
by haklesup
Sun Aug 25, 2002 12:02 am
Forum: General Discussion
Topic: Switch debouncing
Replies: 9
Views: 1365

Switch debouncing

Your comments please:<p>I'm designing a simple 2 digit counter circuit based on the CMOS 4518 BCD counter and 5411 7-segment decoder ICs. The input will come from a momentary pushbutton at the end of a long cable. The whole thing is powered to 12V.<p>I am accounting for EOS and ESD by putting double...
by haklesup
Mon Aug 19, 2002 4:07 pm
Forum: General Discussion
Topic: x10 technology
Replies: 8
Views: 1215

Re: x10 technology

Here is another link<p> http://www.smarthome.com/bookvid.html this has some books like the "X-10 hackers secrets vol 1" and x-10 applications guide" as well as a few other technical books on the subject.<p>Search "home automation" on a search engine then look at the support/technical sections of the...
by haklesup
Mon Aug 19, 2002 1:13 pm
Forum: General Discussion
Topic: x10 technology
Replies: 8
Views: 1215

Re: x10 technology

X10 website itself has one app note on Tansmission theory. http://www.x10.com/support/technology1.htm <p>They also offer a RS232 compatible transmitter reciever at http://www.x10.com/products/x10_tw523.htm <p>A PDF app note with schematic (a link) can be found on that page (above) look for "Download...
by haklesup
Mon Aug 19, 2002 12:59 pm
Forum: General Discussion
Topic: BIOS and device drivers - difference?
Replies: 3
Views: 932

Re: BIOS and device drivers - difference?

BIOS (Basic Input Output System) is firmware and is located in an EPROM on the Motherboard. It is specific to the motherboard hardware and has basic code for booting the system hardware and hard disk drives etc. Real low level stuff and it is independent of the operating system (Windows or DOS). Loo...
by haklesup
Sun Aug 18, 2002 10:21 pm
Forum: General Discussion
Topic: Radio Control Receiver
Replies: 1
Views: 548

Re: Radio Control Receiver

Just a guess but: Reciever 58Mhz <p>Rx often stands for reciever. I have one RC toy that comes in 27, 35, 45, 57MHz versions for competitive racing so 58MHz is in the ballpark.
by haklesup
Sat Aug 17, 2002 11:07 pm
Forum: General Discussion
Topic: Scoreboard design
Replies: 1
Views: 637

Re: Scoreboard design

Do you mean a grid of 6x8 lamps which you light up selectively to display numbers. or some other arrangement of lights. You could make a 7-segment display with the 12V bulbs if you built some sort of bezel/frame and filter to form the characters.<p>However you do it, you will quickly find that you n...
by haklesup
Fri Aug 16, 2002 11:39 pm
Forum: General Discussion
Topic: Filter Choke Overheating
Replies: 4
Views: 897

Re: Filter Choke Overheating

Check the output voltage with a resistive load and you may find that it no longer looks so good (see "PC power supply problems" in the computer part of this forum)
by haklesup
Wed Aug 14, 2002 1:06 pm
Forum: General Discussion
Topic: A little design help...
Replies: 18
Views: 2887

Re: A little design help...

"Wall worts" molded transformers with integrated rectifiers and regulators cap out at less than 1A typically. most I have are less than 600mA. Fine for 1 or 2 fans but not 6. Higher current (compact) supplies are actually small switchers (like the ones used for laptop computers and digicams)these ar...
by haklesup
Tue Aug 13, 2002 6:07 pm
Forum: General Discussion
Topic: If you responded below, Pls read my responce
Replies: 1
Views: 543

Re: If you responded below, Pls read my responce

I basically agree, he should spend a little money and err on the side of safety. on the other hand, your example of death by 12V is a little extreme even if you tried. (and I would not build a pipe bomb any day of the year and thus would never hammer the ends on)<p>I am not as familiar with the UL s...
by haklesup
Mon Aug 12, 2002 11:24 pm
Forum: General Discussion
Topic: A little design help...
Replies: 18
Views: 2887

Re: A little design help...

Correct me if I am wrong but it sounds like you have six 12V, .55A DC fans wired in series for a total of 72V. <p>First, and most importantly, these fans may not be isolated from their cases posing a potential shock hazard.<p>Second, the series configuration is unreliable in that an open in any fan ...