Search found 236 matches

by chessman
Tue Jan 04, 2005 10:18 pm
Forum: General Discussion
Topic: Automatically switching 2 audio signals based on input l
Replies: 9
Views: 3106

Re: Automatically switching 2 audio signals based on input l

Okay, here's where I ask for help.<p>This is what I have so far, it's basically the audio detection module of the circuit:<p> http://www.shootdashizz.com/images/audioswitch.jpg <p>V1 is the PPC audio source. The 1k resistor after the opamp is just a dummy resistor for simulation purposes. R2 is just...
by chessman
Sun Jan 02, 2005 9:11 pm
Forum: General Discussion
Topic: What's everyone working on?
Replies: 52
Views: 18794

Re: What's everyone working on?

Let's see...what am I working on? I'm working on a device for my car that will switch between my music and GPS voice prompts from my pocket PC playing over my car speakers :) <p>Not sure what I'll take on after that...
by chessman
Wed Dec 29, 2004 9:21 am
Forum: General Discussion
Topic: Automatically switching 2 audio signals based on input l
Replies: 9
Views: 3106

Re: Automatically switching 2 audio signals based on input l

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Dale Y: Sounds like a plan to me!<p>No need to detect music level though, just PPC level. The PPC needs to take control whether the music is blaring or off.<p>Relays might be too slow switching. Ne...
by chessman
Wed Dec 29, 2004 1:40 am
Forum: General Discussion
Topic: Automatically switching 2 audio signals based on input l
Replies: 9
Views: 3106

Automatically switching 2 audio signals based on input l

Basically, I need to switch 2 audio inputs based on which one is currently "active", and I need to do it automatically.<p>More in depth, here's the actual situation: I was given a GPS receiver for my Pocket PC for Christmas. The Pocket PC speaker isn't loud enough for me to hear over road noise and ...
by chessman
Thu Jul 15, 2004 7:30 pm
Forum: General Discussion
Topic: Reducing power surge on AC adapter
Replies: 8
Views: 1532

Reducing power surge on AC adapter

Quick and simple question:<p>I have an AC adapter for a laptop that's killing a 12V inverter. The power consumption of the adapter is well within specs of the inverter, yet the inverter is overloaded and shuts off due to an on-power surge.<p>How can I limit this surge?
by chessman
Thu Jan 08, 2004 12:37 pm
Forum: General Discussion
Topic: volts,amps, watt question
Replies: 2
Views: 716

Re: volts,amps, watt question

And remember, with the wall wart you can draw a higher current for a short period of time without damage.
by chessman
Mon Jan 05, 2004 12:34 pm
Forum: General Discussion
Topic: High Power Amps - guitar, car, PA, etc.
Replies: 14
Views: 2790

Re: High Power Amps - guitar, car, PA, etc.

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Glenn Johnson: the dreaded crossover distortion that seems to be the only attractive thing with a pure Class A. <p> <hr></blockquote><p>Also remember that class A amps are mainly used by audiophili...
by chessman
Sat Jan 03, 2004 10:35 am
Forum: Computer Programming
Topic: Building a website (hope this is the right place)
Replies: 19
Views: 5972

Re: Building a website (hope this is the right place)

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by Dale Y: Classes D and above - various digital synthesis schemes. (I don't even try to remember which-is-which.) There are pulse width modulation (PWM), pulse period modulation (PPM), combos of PWM/...
by chessman
Sat Jan 03, 2004 10:28 am
Forum: Robotics
Topic: Laptop LCD and OOpic R
Replies: 3
Views: 2121

Re: Laptop LCD and OOpic R

Theoretically, you should be able to make your own controller card on some displays, but that'd just be a stupid thing to try to do ;)
by chessman
Sat Jan 03, 2004 10:24 am
Forum: General Discussion
Topic: TV as an Oscilloscope
Replies: 13
Views: 2513

Re: TV as an Oscilloscope

Michael - look at the links above.
by chessman
Sat Jan 03, 2004 10:17 am
Forum: General Discussion
Topic: High Power Amps - guitar, car, PA, etc.
Replies: 14
Views: 2790

Re: High Power Amps - guitar, car, PA, etc.

Just thought I'd add that a true Class A amplifier will realisticly be much less efficient than 50%.<p>I know people that have built some class A amps that are lucky to get 10% efficieny.
by chessman
Sat Jan 03, 2004 10:12 am
Forum: General Discussion
Topic: White LED strobe
Replies: 40
Views: 6182

Re: White LED strobe

I'm not going to go into the whole technical aspects of the project.<p>What I want to say is that a conventional strobe is not instantly full brightness and then off again as an LED is. An LED does not take nearly as long as a flash tube to "light" to full brightness.<p>Jolly Roger, the reason the L...
by chessman
Sat Jan 03, 2004 9:50 am
Forum: General Discussion
Topic: pioneer parts id?
Replies: 5
Views: 956

Re: pioneer parts id?

I can't remember where at all, but I've found an internet resource for those types of chips before (multichannel amp, STRXXXXX). I serviced a car audio cd receiver that had some chip like that and needed a new one (casing was cracked open, leads literally torn in half).<p>Anyway, I'll search around ...
by chessman
Fri Oct 03, 2003 11:46 am
Forum: General Discussion
Topic: My Optrex LCD
Replies: 2
Views: 697

Re: My Optrex LCD

Any help?
by chessman
Fri Oct 03, 2003 11:43 am
Forum: General Discussion
Topic: 1981 Deloren
Replies: 2
Views: 836

Re: 1981 Deloren

<blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr>Originally posted by josmith:
I think you need to adjust the flux capacitor.<hr></blockquote><p>I concur