Search found 2856 matches

by haklesup
Wed Mar 17, 2004 1:16 pm
Forum: General Discussion
Topic: LCD Displays
Replies: 10
Views: 1813

Re: LCD Displays

Why not just buy a generic LCD monitor for desktop use and remove the case.
by haklesup
Tue Mar 16, 2004 3:05 pm
Forum: General Discussion
Topic: help with x-10
Replies: 5
Views: 1272

Re: help with x-10

This is one of the best X-10 sites I know of<p>http://www.geocities.com/IDO_Bartana/<p>it has theory, projects and modifications for 110 to 220V use. Protocols for the carrier current and RF systems are explained. Schematics are also posted for many modules etc.
by haklesup
Tue Mar 16, 2004 1:29 pm
Forum: General Discussion
Topic: help - need encapsulant?
Replies: 5
Views: 1169

Re: help - need encapsulant?

While almost any coating (including varnish) will provide a suitable mechanical barrior, you may be unhappy with the electrical performance of some coatings such as dielectric withstanding voltage or the leakage caused by additives or uncured material.<p>You also should consider what happens if you ...
by haklesup
Tue Mar 16, 2004 1:18 pm
Forum: General Discussion
Topic: Sending data on AC supply lines
Replies: 11
Views: 2477

Re: Sending data on AC supply lines

The X-10 protocols are explained on links from this site http://www.geocities.com/IDO_Bartana/ Check out the Technical articles link. <p>The X-10 protocol works for digital data sent at rates no faster than 120 bps since it is encoded at the zero crossings. If you want to transmit audio, you will ne...
by haklesup
Thu Mar 11, 2004 12:07 pm
Forum: General Discussion
Topic: spark plug voltage
Replies: 5
Views: 1243

Re: spark plug voltage

If you connect your multimeter in place of a typical spark plug, you will most likly kill the meter.<p>Most DMM and Analog meters have a 600V max input voltage or less. It should be clearly marked on the meter on the front or embossed on the back. A coil output voltage probably 10 or more times high...
by haklesup
Tue Mar 02, 2004 4:13 pm
Forum: General Discussion
Topic: Pre-amp Circuit Help
Replies: 21
Views: 3402

Re: Pre-amp Circuit Help

I agree with cato in that the issue may not be the circuit design but the selection of the component.<p>The 741 is an old design and has very loose specs. Presently, there are many op amps with excellent specs. Type "op amp selection guide" into a search engine and go from there. It is likly that yo...
by haklesup
Tue Mar 02, 2004 1:09 pm
Forum: General Discussion
Topic: Connecting Portable CD player to car radio
Replies: 5
Views: 1099

Re: Connecting Portable CD player to car radio

Unless you have a schematic, you're more likly to break the radio than you are to design a line level input plug and a switch to activate it. This would require an opamp for level shifting and isolation from the main amplifier circuit. If you have a radio with say a broken tape player, you might be ...
by haklesup
Wed Feb 25, 2004 2:39 pm
Forum: General Discussion
Topic: Automotive dual battery question
Replies: 29
Views: 5096

Re: Automotive dual battery question

Do they still put big diodes between the main battery and the auxillary battery. A properly connected diode will prevent one battery from becoming a load if the other one should become too weak to fully charge or if a cell shorts out and the voltage drops.<p>In such a configuration, the Aux battery ...
by haklesup
Wed Feb 25, 2004 2:13 pm
Forum: General Discussion
Topic: 1v to 5v output
Replies: 10
Views: 2091

Re: 1v to 5v output

Since the inputs take very little current, you can do the whole thing with a voltage divider.<p>One or two fixed resistors and a potentiometer should do the trick.<p>Place the resistors and pot in series between the source (10V) and ground with the pot in the middle and the wiper connected to the in...
by haklesup
Wed Feb 25, 2004 1:45 pm
Forum: General Discussion
Topic: Wireless driveway alarm
Replies: 14
Views: 2426

Re: Wireless driveway alarm

I gather proximity sensor is IR and the communication link to the base is RF.<p>You can try to improve the efficiency of the transmitter and/or reciever by modifying the antenna it uses. Try to find the antenna node on the PCB (it may be nothing more than a PCB trace or wire stub) and extend it with...
by haklesup
Wed Feb 25, 2004 1:23 pm
Forum: General Discussion
Topic: who makes this POT?
Replies: 12
Views: 1732

Re: who makes this POT?

I have no clue, the logo on the RS website is unclear and I have no sample. Besides, the logo was unfamiliar anyway. Is there a country of origin marking on the device. <p>By offshore I meant any one of a number of OEM manufacturers in China, Taiwan, Hong kong, Malasia or Phillipines etc (S E Asia)....
by haklesup
Tue Feb 24, 2004 1:39 pm
Forum: General Discussion
Topic: who makes this POT?
Replies: 12
Views: 1732

Re: who makes this POT?

Horizontal Trim pot. probably 6mm size, Open Frame, Carbon comp.<p>Looks like<p> www.Bourns.com model 3319<p>Alps Model RH01(www.potentiometer.com bottom left link to trimmers) Alps website hard to navigate<p>Panasonic (didn't look it up but they are a primary OEM) <p>Also take a look at Ohmmite, Cl...
by haklesup
Mon Feb 23, 2004 4:50 pm
Forum: General Discussion
Topic: measuring AC/DC Amps
Replies: 6
Views: 1197

Re: measuring AC/DC Amps

Ideally, the clamp on meter probe will not measure any DC component. If you do get anything off your alternator, it is just ripple current or the big surge you get when you turn on or off current.<p>66% factor is that proportion of the answers that will make sense ;) (Sorry, just kidding. I couldn't...
by haklesup
Thu Feb 19, 2004 1:34 pm
Forum: General Discussion
Topic: lightning strike
Replies: 13
Views: 2306

Re: lightning strike

I don't think that NEC has anything to say about structural protection from lightning except to how it pertains to protecting the active electrical distribution system like the breaker box and service connections.<p>In general, only the local building code would require lightning protection and prob...
by haklesup
Wed Feb 18, 2004 3:09 pm
Forum: General Discussion
Topic: Internet Bandwidth
Replies: 19
Views: 3445

Re: Internet Bandwidth

It seems both definitions are correct. We may all have to increase our intellectual bandwidth to accept alternate definitions as the technology progresses further. That's how the english language works (among others). In fact websters (www.m-w.com) lists both definitions while britannica only lists ...