Re: Mockingboard in 128EX?

["Bill Garber" <willy46pa@comcast.net>]

"Ed Eastman" <noone@nowhere.net> wrote in
message news:diqs4v$qnf$1@unlnews.unl.edu...

> 12V line?  I think you found your power source for a real amplifier 
> circuit then!

If by real you mean more powerful, do you think
that 300mA will be enough?

> Seriously, you'd need an isolation cap anyway, it would filter the noise 
> with an added resistor. (RC bandpass circuit.) Added bonus, no LONG wire 
> along the outside of the IIc.  :)

True, but again, what about Video-7 users.

> (Looking for schematics to see if the IIc speaker is directly connected to 
> video port line on the same circuit, dang he doesn't have any!)

Looks to me as though Pin-5 is the audio out line.
Taken from Pin-5 of the earphone out circuit. You
may have to be happy with the internal speaker.

> Thoughts, thoughts, thoughts...
> So could this sound card circuit be made very small?  Say small enough to 
> retro fit inside the IIc case?  (wrapped in foil, then insulator) There is 
> lots of room inside the Power Supply section of a IIc or adjacent to the 
> floppy disk in a IIc+.  :)

Well, no, being this thing is about 8" x 4" as it is.
I was hoping to cram it onto a board about half the length
and just slightly narrower.

> (Never wants ANYTHING to not look stock or dongles hanging out...)

(Wants everything to not look stock.)   :o)

Bill Garber