Rockbox mail archiveSubject: Re: general notes on AJB circuit
From: Eric Linenberg (elinenbe_at_umich.edu)
It seems the Archos writes a few things to the hard drive which in the
AJ> Just thought I'd deliver some general info on the AJB HW whilst I am still working on the schematic.
AJ> * During the whole time I've been buzzing this thing out, it has remembered the last song played - this without attached batteries. Therefore, the status of the currently played song must be
AJ> * The value of the caps on the output circuit is only 10uF (which is still kinda impressive for a 1206 based ceramic, but I digress ...). Therefore, with 18 Ohm buds and the stock standard
AJ> F(3dB) = 1/(2*Pi*R*C)
AJ> Where R = (47 + 18) || 1k5 = 62.3 Ohms
AJ> Therefore, F(3dB) = 255 Hz !!! No wonder this unit has a problem with bass at low load impedance.
AJ> * For those of you wanting to take the unit appart to get at the LCD or Backlight, I gotta warn you - it can be a bastard getting the zebra stripe (little rubbery thingie that connects the LCD
Page was last modified "Jan 10 2012" The Rockbox Crew