my birthday, c. 1972

I’ve kept this catalog bit in the pocket with the precision TV tuning tools.

the kit

I was too shy to ask for the vo meter option.

I still have most of the tools too.

Posted at 5pm on 06/25/08 | no comments | Filed Under: notes read on

hacking the 16mm optical track, notes

projector exciter circuit

there is a 26 frame offset between picture and sound
ie: 1.0833 seconds

  1. amplitude modulation: more light => more sound
  2. amplitude is the height of the wave, and
  3. frequency is the distance between wave crests

film moves at 24fps
there are 40 frames per foot, so film runs through the sound gate at 7.2inches/sec

to make middle C you would draw a waveform with 512 cycles per second. graphically that works out to:

512cps/7.2in = 71cycles per inch
  • how hard is
Posted at 7am on 06/25/08 | no comments | Filed Under: notes read on