> >> Also as the speaker is connected to the analog board and not the logic > >> board, does anyone know if the audio is simply carried direct or is it > >> amplified on the analog board? > > > >IIRC, the sound signal in the analogue connector of the digital board (the > >white > >two-rows connector near the center of the board) isn't amplified. A different > >thing is the sound out jack: I think it has enough power to drive a pair of > >headphones, even if it's intended to be connected to an amplifier. > > > > If it isn't amplified on the logic board, then that would mean there is an > amplifier on the analogue board. Does anyone have a schematic or > information on the Classic Analogue board to confirm this?
IIRC, the Classic's sound system is similar to that in other compacts (exc. the SE/30). There's a Sony sound chip that does the heavy lifting, and a simple amplifier, on the analog(ue) board, that drives the speaker and headphone jack. The internal speaker is a high-impedance beast (32 ohms, instead of the more common 8), so the amplifier actually drives both. I've had a Classic analog board sitting on my bench for a year now; I've been intending to trace it out "one of these days." Maybe your question will get me to actually do it, at least partially. I'll post again if/when I have new info. --Cheers, Tom -- Prof. Thomas H. Lee Center for Integrated Systems, CIS-205 420 Via Palou Mall Stanford University Stanford, CA 94305-4070 http://www-smirc.stanford.edu 650-725-3709 ph, -3383 fax -- Compact Macs is sponsored by <http://lowendmac.com/>. Support Low End Mac <http://lowendmac.com/lists/support.html> Compact Macs list info: <http://lowendmac.com/lists/compact.shtml> --> AOL users, remove "mailto:"; 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/compact.macs%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
