Comments on: Audio output on RS-232 http://vivara.net/blog/?p=24 Mark is a weblogger! Mon, 06 Sep 2010 11:09:29 +0000 http://wordpress.org/?v=2.3.3 By: Vladislav67 http://vivara.net/blog/?p=24#comment-65854 Vladislav67 Wed, 24 Mar 2010 15:10:10 +0000 http://vivara.net/blog/?p=24#comment-65854 <a href="http://rupeople.com/" rel="nofollow">Это должно быть в цитатнике</a> Это должно быть в цитатнике

]]> By: Vladislav65 http://vivara.net/blog/?p=24#comment-65838 Vladislav65 Tue, 23 Mar 2010 22:25:53 +0000 http://vivara.net/blog/?p=24#comment-65838 <a href="http://www.generals-zh.ru/" rel="nofollow">Я писал что-то подобное, но у Вас тема более глубого раскрыта</a> Я писал что-то подобное, но у Вас тема более глубого раскрыта

]]> By: Vladislav30 http://vivara.net/blog/?p=24#comment-65811 Vladislav30 Mon, 15 Mar 2010 15:22:24 +0000 http://vivara.net/blog/?p=24#comment-65811 <a href="http://japantheatre.ru/" rel="nofollow">Советую подписку на РСС поставить на видном месте! Читателей будет больше! Особенно на таком блоге, как у вас! Пробовала - у меня на 50% больше посетителей стало!</a> Советую подписку на РСС поставить на видном месте! Читателей будет больше! Особенно на таком блоге, как у вас! Пробовала - у меня на 50% больше посетителей стало!

]]> By: bkizzy http://vivara.net/blog/?p=24#comment-62261 bkizzy Sat, 31 Oct 2009 06:24:20 +0000 http://vivara.net/blog/?p=24#comment-62261 Howdy! Nice work. I am built a microphone that connects to serial, but I can't seem to get the data to be sound. How do I do that? Any tips would be greatly appreciated. Howdy! Nice work. I am built a microphone that connects to serial, but I can’t seem to get the data to be sound. How do I do that? Any tips would be greatly appreciated.

]]> By: BCP http://vivara.net/blog/?p=24#comment-1852 BCP Sat, 16 Sep 2006 17:57:14 +0000 http://vivara.net/blog/?p=24#comment-1852 RS232 ports are designed with a current limit (12-20mA) in mind and will survive a direct short circuit...a better way to do this of course is a "covox device" which is a resistor DAC on the parallel port. Either way, its probably only usefull to do this is embedded devices/routers/etc for warning tones and such. RS232 ports are designed with a current limit (12-20mA) in mind and will survive a direct short circuit…a better way to do this of course is a “covox device” which is a resistor DAC on the parallel port. Either way, its probably only usefull to do this is embedded devices/routers/etc for warning tones and such.

]]> By: Liam http://vivara.net/blog/?p=24#comment-196 Liam Wed, 18 Jan 2006 14:34:00 +0000 http://vivara.net/blog/?p=24#comment-196 ^^^^ Agreed with Elektrojänis Even most soundcards have difficulty adequately driving a pair of headphones. It's not so bad when connected to the input on an amplifier as the load effectively--->infinity. So effectively, the card will 'see' a huge load. The effect is particularly noticable in the bass tones, they litereally drop out when the load is too heavy (i.e. the cutoff increases). I'd assume the same for the serial port. In fact, if you've joined both headphones in dual-mono (parallel) then you'll be dropping the impedence even more = more instantanious current = smoke your gear. ^^^^ Agreed with Elektrojänis

Even most soundcards have difficulty adequately driving a pair of headphones. It’s not so bad when connected to the input on an amplifier as the load effectively—>infinity. So effectively, the card will ’see’ a huge load. The effect is particularly noticable in the bass tones, they litereally drop out when the load is too heavy (i.e. the cutoff increases). I’d assume the same for the serial port. In fact, if you’ve joined both headphones in dual-mono (parallel) then you’ll be dropping the impedence even more = more instantanious current = smoke your gear.

]]> By: Elektrojänis http://vivara.net/blog/?p=24#comment-192 Elektrojänis Sat, 14 Jan 2006 19:51:36 +0000 http://vivara.net/blog/?p=24#comment-192 Hmmm... Maybe you should use an amplifier between the serial port and the speaker/headphones. Serial port's are probably not be designed to drive low impedance loads. If you are clever you could work the amplifier in high efficiency class D. Hmmm… Maybe you should use an amplifier between the serial port and the speaker/headphones. Serial port’s are probably not be designed to drive low impedance loads. If you are clever you could work the amplifier in high efficiency class D.

]]> By: ian king http://vivara.net/blog/?p=24#comment-183 ian king Wed, 09 Nov 2005 15:16:15 +0000 http://vivara.net/blog/?p=24#comment-183 this is so cool i tryed to do this earlier and i blowed out my rs232 controler thanks fo the design this is so cool i tryed to do this earlier and i blowed out my rs232 controler thanks fo the design

]]> By: Robert http://vivara.net/blog/?p=24#comment-181 Robert Wed, 02 Nov 2005 11:12:30 +0000 http://vivara.net/blog/?p=24#comment-181 The headphones were some cheap folding ones but I was combining left and right together. You can see the output of pciconf here: http://home.m33p.be/~robert/pciconf The parallel port is working fine as I have a thermal printer attached to it spewing out selected output from syslogd. The headphones were some cheap folding ones but I was combining left and right together. You can see the output of pciconf here: http://home.m33p.be/~robert/pciconf

The parallel port is working fine as I have a thermal printer attached to it spewing out selected output from syslogd.

]]> By: Mark http://vivara.net/blog/?p=24#comment-180 Mark Wed, 02 Nov 2005 02:44:19 +0000 http://vivara.net/blog/?p=24#comment-180 Sorry about your serial port. What kind of headphones were you driving? I wonder if the serial port is integrated with the floppy controller on that motherboard? I guess it's too late to do a 'lspci' (or the BSD equivalent) to see what chips are being used. Sorry about your serial port. What kind of headphones were you driving?

I wonder if the serial port is integrated with the floppy controller on that motherboard? I guess it’s too late to do a ‘lspci’ (or the BSD equivalent) to see what chips are being used.

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