[sdiy] Analog Delay Lines (was) [common acronyms?]

[media at mail1.nai.net]

At 2:19 PM -0700 10/09/01, GothGeek Sysadmin wrote:
>
>The tuna can you see in there doesnt actually rotate.  Inside it is a disk
>with a couple rubber wipers.  From what I can gather its actually an
>electrostatic unit, but not much info is available.

Good point -- that would make more sense.  I haven't opened it up in years,
but I distinctly remember an electric motor that changed speed.

Afaik, the voltage representing the input signal is placed on the drum by
the "record" wiper, then discharged and converted to the output signal by
the "playback" wiper.  What I don't understand is why doesn't the can
conduct making the electrostatic charge equal all over.  Any ideas??

>Make sure it stays full of oil.  If not the shaft will seize up and then
>>you have to take it fully apart to free it up.  Then insert my previous
>>rant about finding oil for it...

The oil in there now might contain toxic PCB's, so I'm not going to open it
up to add more oil unless it's absolutely necessary.   Then again, I
haven't used it in while.