Amanda Ward wrote: > Hi All... > > Anyone know what the impedance is for the audio input jack on my iMac > (Intel early 2008)? > I have an older piece of equipment whose audio output normally drives > a 4K ohm magnetic headphone. > Audio quality isn't a big issue... the output is just occasional > spikes with some low level background noise. > Looking to write a program to count the spikes and develop some > statistical values. > Do I need to build/find an impedance matching circuit or is it close > enough to for a direct connection to work? > I can use one of my G4/G3 towers or my Powerbook as well.
Impedance matching isn't a big concern, signal level is. That input is line level, 1V. It your source drives a 4K load that should work okay as long as it's max output is around 1V. -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting "I'm a designated driver on the Information Super Highway" --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to Low End Mac's iMac List, a group for those using G3, G4, G5, and Intel Core iMacs as well as Apple eMacs. The list FAQ is at http://lowendmac.com/imac/list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/imaclist?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
