Search found 2766 matches

by haklesup
Wed Jan 22, 2003 4:01 pm
Forum: General Discussion
Topic: crystal rating
Replies: 7
Views: 986

Re: crystal rating

It can't be 16kHz since the lowest frequency crystal I see in catalogs is 1.0MHz or 1.544MHz and the highest is around 150MHz<p>If the P/N were to be interpreted as 1600kHz then that would make it 1.6MHz which dosen't seem to be a common value in these same catalogs. Most jump from 1.544 to 1.8432MH...
by haklesup
Fri Jan 17, 2003 11:10 am
Forum: General Discussion
Topic: Waves Converter
Replies: 38
Views: 5233

Re: Waves Converter

Michael, check the replies to your private messages by clicking on the "My Profile" link at the top of the Forum page.
by haklesup
Mon Jan 13, 2003 4:01 pm
Forum: General Discussion
Topic: heated bobbers
Replies: 7
Views: 1435

Re: heated bobbers

That may be a tough nut to crack. A fair amount of engineering is needed to match the heater, the battery and the operating conditions (cold and wet)and put in a package that meets the need. Problem is power density. Heating elements tend to draw large amounts of power while batteries are limited in...
by haklesup
Sun Jan 12, 2003 8:56 pm
Forum: General Discussion
Topic: Dropping voltage on "Christmas Lights..."
Replies: 9
Views: 1348

Re: Dropping voltage on "Christmas Lights..."

If you don't actually burn your finger on the resistor, its not too hot and you can't beat the simplicity of a resistor. What you do need to worry about is the heat discolering or warping the plastic or other materials in its vicinity. If you have some air space around the R when you are finished, i...
by haklesup
Sun Jan 12, 2003 8:38 pm
Forum: General Discussion
Topic: Garage door opener safety sensors
Replies: 13
Views: 2248

Re: Garage door opener safety sensors

Keymaker- good to see you're feeling better :p <p>Shorting the wires for the reciever might work but it may also want a load, experiment with a resistor or diode if a simple short dosen't work. Leave the transmitter leads open because all that is a voltage source for the light (beam)<p>The oldest op...
by haklesup
Sun Jan 12, 2003 11:11 am
Forum: General Discussion
Topic: Poptronics Is Gone???
Replies: 48
Views: 13052

Re: Poptronics Is Gone???

Neil- You're preaching to the choir here.<p>Have you ever noticed how long your stuff lasts and how soon those "operators" break theirs and ask you to fix it.<p>It's not just Poptronics. Many magazines have gone out of print last year. I think it's partly the internet stealing readership but it is a...
by haklesup
Sun Jan 12, 2003 10:36 am
Forum: General Discussion
Topic: Dropping voltage on "Christmas Lights..."
Replies: 9
Views: 1348

Re: Dropping voltage on "Christmas Lights..."

Purely resistive voltage dropping will create a fair amount of heat considering the amount of voltage you are trying to "waste" as heat. <p>As an alternative to resistors you could wire 2 or 3 bulbs in series or drop the excess voltage using a zener diode and resistor combination or any combination ...
by haklesup
Thu Jan 09, 2003 7:54 pm
Forum: General Discussion
Topic: Power supplies
Replies: 9
Views: 1364

Re: Power supplies

If you do use a PC power supply, read the output specs (sticker on side) carefully. Note that very often the 5V and/or 12V supplies do not guarantee regulation until a minimum current load is applied. In other words, it may not be 5V under no load or small load conditions.<p>AT supplies are easier t...
by haklesup
Wed Jan 08, 2003 7:37 pm
Forum: General Discussion
Topic: Big Screen TV Splitter
Replies: 3
Views: 764

Re: Big Screen TV Splitter

I haven't seen anything exactly like that. You may want to try your question in the Ausio Visual Forum www.avsforum.com there are some hard core couch potatos there who may be able to help you.<p>If your bigscreen TV can take input from a PC you may have other options. A couple of USB video capture ...
by haklesup
Sat Jan 04, 2003 10:05 pm
Forum: General Discussion
Topic: Garage door opener safety sensors
Replies: 13
Views: 2248

Re: Garage door opener safety sensors

The transmitter is a lamp of some sort. It may be infrared or it may be plain white light and a lens. The reciever is a photosensor sensitive to the light from the transmitter. The TX is simply aimed at the RCVR or the door won't work. If the beam is broken, the logic circuit turns off the motor and...
by haklesup
Fri Jan 03, 2003 12:55 pm
Forum: General Discussion
Topic: Waves Converter
Replies: 38
Views: 5233

Re: Waves Converter

Michael<p>I didn't mean to be so pessimistic in my last post but I do still favor a low-tech solution here. A roll of "No cell phone" stickers (like the no smoking symbol) strategically stuck in visible places, a few "please turn off cell phone" signs by the door, a verbal reminder during the announ...
by haklesup
Mon Dec 23, 2002 6:03 pm
Forum: General Discussion
Topic: Monitoring electical usage on multiple circuits
Replies: 4
Views: 881

Re: Monitoring electical usage on multiple circuits

I'm glad you want to monitor AC current because DC is a pain in the neck unless you use a series resistor.<p>What you want is a simple data acquisition system. Almost any system with a few channels of A/D would work. Check out this URL http://www.dataq.com/products/startkit/di154rs.htm they have a 4...
by haklesup
Mon Dec 23, 2002 5:32 pm
Forum: General Discussion
Topic: Poptronics Is Gone???
Replies: 48
Views: 13052

Re: Poptronics Is Gone???

I sure do remember Radio Electronics. I started off with it in 1982 and rode it all the way through Elecronics Now and a couple years into Poptronics when it stopped serving my needs. I had most of my back issues until a few years ago when I let someone clean them out based on the 10-year rule (if y...
by haklesup
Thu Dec 19, 2002 6:49 pm
Forum: General Discussion
Topic: Waves Converter
Replies: 38
Views: 5233

Re: Waves Converter

Michael<p>I suspect that the design of a transmitter of your specification on both the circuit synthesis(theoretical design) and the actual physical circuit design (nevermind the special considerations you need to take in laying out an RF circuit onto a PCB) are well beyond the scope of this or any ...
by haklesup
Tue Dec 17, 2002 6:13 pm
Forum: General Discussion
Topic: Hollywood tracker beacon?
Replies: 9
Views: 1649

Re: Hollywood tracker beacon?

A bit more on avalanche beacons can be found here:http://www.couloirmag.com/gear/reviews/accessories/beacons99/beacons99.htm<p>I think that the beeping reciever you describe from the movies would probably work like this: The transmitter would be a continuous wave TX at a relatively low frequency of ...