Date: Fri, 28 Sep 2001 10:33:44 +0200 From: "Robbert J. van Herksen" <[EMAIL PROTECTED]> Subject: RE: Key commands and impedance
About the speakers and it's impedance: It doesn't make much sense to take an ohmmeter and measure the resistance of the speakers. The 8 or 4 Ohm values that we always talk about is Impedance, which means that it's the resistance for AC signals. not for dC, and they differ. Moreover, I suppose that there is an amplifier in those speakers (you talk about batteries). the imputcircuit of the amplifier gives a totally wrong indication of dC resistance. the fact that the speakersound is a bit distorted can be caused by the lower voltage of the Nicad rechargable batteries. Try different adjustments at libretto outputlevel and amplificationlevel of the speaker amplifier. put the libby on the low side, and make sure that you don't put the speakeramplifier to high, otherwise you will get distortion. those amplifiers are maybe 2 or 3 Watss at most. cheers Robbert > -----Original Message----- > From: Raymond [mailto:[EMAIL PROTECTED]] > Sent: Friday, September 28, 2001 07:08 > To: Libretto > Subject: Re: Key commands and impedance > > > Date: Fri, 28 Sep 2001 13:00:42 +0800 > From: Raymond <[EMAIL PROTECTED]> > Subject: Re: Key commands and impedance > > Hi Matt, > > It wouldn't surprise me if the 50ct DIDN'T have a key combo, > there were a number of laptops by both Compaq and Toshiba about > that era and perhaps a little earlier that either didn't have the > option or had problems (the Compaq Contura comes to mind - it DID > have the button but it only worked properly if the planets were > in the right alignment and if Jupiter was rising in Orion and ... > you get the idea). > > Generally hot plugging monitors (or most other things for that > matter) isn't a big problem from the point of view of hardware > (of course, if your software doesn't know about it then you're > often sunk) and it'll certainly solve the "Can't see the screen > to boot" problem (plus it'll also save your audience from having > to go through the boot process with you). Once you're in Windows > without the external monitor, you can hot plug the monitor (it > won't be active yet so it should be even safer than normal hot > plugging) then use the display switcher (start>programs>toshiba > utilities I believe) to get your external monitor going (you can > assign this to a hotkey if you like or if you don't like the idea > of hot plugging). > > If you're worried about the sparks that you sometimes see when > you hot plug battery powered devices together (as the ground > rails equalize) you can hold one of the port shells on the lappy > and touch a ground point on the monitor with a finger before you > bring them together. I've never damaged a video card or a monitor > by hot plugging, certainly even the cheaper KVM switches > effectively hot plug monitors in the way they switch from one set > to another (and where I used to work, we'd switch monitors a few > times every hour and these monitors and video cards have been > doing this for years without ill effects). OK correction, the > only time I've damaged a monitor by hot plugging is when I > slipped and bent the pins on the back (but thats a different > story ... hehe). > > I dunno about your walkman issue, I've not gotten around to > getting an adapter that'll let me plug anything into the 1.5mm > phono jack in the back of my lappy yet ... one thing you might > wanna try though (in the unlikely event that you haven't already > tried) is to turn the volume on the lappy down and the volume on > the speakers themselves up. I find that with Toshiba Satellite > and Tecra laptops (the few that I've used anyway) you tend to > overdrive powered speakers if your volume level on the laptop is > over about 1/4 level. Regardless of what the manual says, the > 'headphone' port on most of the laptops I've seen are powerful > enough to drive 8 ohm unamplified speakers to a comfortable level > without any ill effects (if you wanna double check you could get > your ohmmeter out and check your walkman speakers but they're > unlikely to be anything less than 8 ohms in which case it should > be fine). You probably found a difference going from NiMH to > alkaline because the amplifier in the speakers would probably > have been biased for 1.4-1.5 volts per cell (where NiMH only > gives 1.1-1.25 volts per cell), this coupled with possibly > overdriving the input by turning the volume on the lappy way up > will almost always cause distortion. Bear in mind that those > things weren't designed to give a big sound ;-) > > *sigh* the next question is why the heck I felt compelled to > write all this when I really didn't answer either of your > questions ... ah well ... > > I might as well ask a question of my own to make this post > worthwhile. Does anyone know if there is any way to emulate the > numeric keypad and other extended keys on the Libretto keyboard > (or if there is any program that'll allow me to map key combos to > emulate the numeric keypad)? Alternatively does anyone know how > to do ASCII characters (eg. Alt-0186 to type the '�' character) > WITHOUT having to fight through charmap? > > > - Raymond > > > > At 09:23 PM 27/09/2001 -0700, you wrote: > >Date: Fri, 28 Sep 2001 04:15:30 +0000 > >From: "Matthew Hanson" <[EMAIL PROTECTED]> > >Subject: Key commands and impedance > > > >Two questions for anyone who might help: > > > >1. Is there a key combination for the 50ct and 70ct that will > enable the LCD when the system boots with an external monitor connected? > > > >I had a hell of a time to even SEE a projection system screen > from the back of a hall in order to navigate the Windows menus (I > didn't... a 16 year of kid just rebooted me without the monitor, > and jammed the monitor plug to the back of the Libby hot. But he > managed to get my sister's larger Toshiba notebook to respond to > a Function-F8 command that activated that LCD immediately. > > > >2. Has anyone else tried hooking a couple little walkman > external speakers to their Libretto. I got a set of little Sony > SRS-A21 walkman speakers to travel with, and found the sound > seemed a bit distorted with my NiMH rechargeable AAs. I put some > alkalines in, which seemed to improve the sound, but I'm still > not satisfied. I'm wondering if there may be an impedance > problem between the 50ct output circuit and the walkman speakers > that may be causing the problem. Maybe I just need to get a > different pair of speakers. > > > >Matt > > > > > >_________________________________________________________________ > >Get your FREE download of MSN Explorer at > http://explorer.msn.com/intl.asp > > > > > > > > > >************************************************************** > >http://libretto.basiclink.com - Libretto mailing list > >http://libretto.basiclink.com/archive - Archives > >http://www.picante.com/~gtaylor/portable/faq.html - FAQ > > -------TO UNSUBSCRIBE------- > >Reply to any of the list messages. 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