[sdiy] voice recorder

[ElmacacoX at aol.com]

while at radioshack today I saw the ISD1000A chip, some marked $17, and 
another marked $9.95, so I grabbed it, and it ended up being only $5.38.

I just read the app notes and it seems pretty simple to implament into a 20 
second sample jammie module.  no need to even mess with the address points 
since in operation mode you can move the playback from sample to sample (you 
can sample more than once within the twenty seconds, although you can only 
loop the sample that begins at the beginning, unless you add external 
circuitry).  you also can only loop if you don't overload the memory, so less 
than 20 seconds.

I guess for wavetable modules and whatnot based on this you'd need extensive 
logic on the address pins.  not really what i am going for.  

the only thing that seems tricky to me is matching up the impedeances for use 
with my synths and stuff, and also attenuating the input signal or something 
since it can only have 50mV at the analog input. and also maybe someway to 
mess with the internal sample clock, it has a clock input, but the app notes 
don't go into it.

This sounds like too much fun!

Ed