Re: IIe sound output

[et472@FreeNet.Carleton.CA (Michael Black)]

Simon Williams (DONTemail@luddite.ca) writes:
> Anyone tinkered with replacing the IIe's crappy speaker with a line out?
> I'm a little hesitant to connect the wires up to my stereo without first
> hearing from someone who's already been electrocuted =8-O
> 
> SW

Unless the IIe changed it's circuitry from the II, it's not going to
be just a matter of running a cable.

I haven't looked at the II schematic in a while, but memory tells me
the internal speaker is connected between the +5v line and the collector
of a transistor.  You don't want to run that +5v line to your stereo.
And if the speaker is not there, that transistor will not be able to
operate.

You need to take the collector side of the speaker and connect that to
the input of your stereo, using a capacitor to ensure that the DC voltage
doesn't get into the stereo.  And then connect the ground of the Apple to
the ground of the stereo.  And unless you are willing to leave the speaker
in the IIe, you're going to have to put some resistor, maybe 100 ohms or
so, between the collector of the transistor and the +5v line, ie between
the two points that the speaker is connected to now.

I suspect some have done this, and can provide specific values, but I
thought it was important to warn you against just running the wires 
to your stereo.

    Michael