[sdiy] Xfig users

[Dave Manley]

Ingo Debus wrote:
>
> Am 06.09.2009 um 02:22 schrieb fmg:
>
>> And not to be too OT, an old project: a EQ/Mix I made with a VFD biased
>> for linear operation. (One of the last schematics made with Xfig)
>>
>> http://www.geocities.com/eqys/var_tmp/vfd_eq_mix_01b.pdf
>
> That's amazing! What does the VFD do here, is it a buffer?
>
> Ingo
Looks like you can use a VFD as an amplifier:

http://www.hpfriedrichs.com/rr-vfd.htm which links to a video: 
http://www.youtube.com/watch?v=aiszksJs9C8

Or another (I googled: vacuum fluorescent display amplifier):

http://www.5volt.eu/archives/62

-Dave

BTW: in the video is that guy using a old-school hand cranked detonator 
(not sure what they are really called) re-purposed as a power supply????