At 3:53 PM +0200 6/6/02, mart wrote: > >I recently got an Asante micro asanteprint through the LEM swap list. I >>hope to use it to get my vintage appletalk network Macs talking to their >>PPC ethernet brethren. >> >>The problem is... it don't work! [...] >> >>Here's the rub. The wall wart that was sent with the device outputs 12 >>VDC. The device specs say input should be 12 VAC. Before I drive out to >>All Electronics (it *is* nice to live within driving distance of them) >>for a 12 VAC wall wart, does anyone know if there's anything inside the >>asanteprint that needs AC, or does it just get rectified to DC inside >>there anyway? > >Yes, AFAIK, AC from a wall-wart to digital/consumer electronics gets >rectified to DC inside >there anyway? The fun part is that mostly (with a common 'double rectiefier >bridge' in there) you can still feed the device with DC, although it states >it wants AC. > >But that does not always hold true, perhaps due to the use of other >rectifier tricks or maybe because of the voltage loss of 0.6 Volts over the >(unused) diodes. Sorry :)
In the Shiva Net Serial, IIRC, they require AC in and use it to get + and minus voltage internally. The minus supply is needed for the serial output. A more modern design would likely use an inverter to generate the negative supply from the positive. I suspect a number of modems do the same thing. Voltage drop shouldn't be a big issue, wall warts have such poor line and load regulation characteristics that they have to operate as several volts more than is needed, letting the regulator turn the excess into heat. > >>I'm inclined to believe that it does require AC [...] > >I'm also inclined to suggesting that indeed you try to stick to how it was >meant :) Other than this wall wart thing, my guess is that a whole bunch of >network things can be wrong. > >And I don't even know what an Asante micro asanteprint IS , other than that >it was obviously made by a company called Micro print. It's made by a company called Asante, an old name in Mac networking. It is an Ethernet to LocalTalk bridge. It was produced specifically for connecting older LocalTalk printers to iMacs and newer Macs that don't have LocalTalk. -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting [EMAIL PROTECTED] "I'm a designated driver on the Information Super Highway" -- Vintage Macs is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Enter To Win A | -- Canon PowerShot Digital Cameras start at $299 | Free iBook! | Support Low End Mac <http://lowendmac.com/lists/support.html> Vintage Macs list info: <http://lowendmac.com/lists/vintagemacs.shtml> The FAQ: <http://macfaq.org/> Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/vintage.macs%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
