Re: Thursday, Jan 27

[Joyce Poon <poonj@ecf.utoronto.ca>]

My plans for tomorrow:

Today I tested the emitter circuit (it WORKS!).  Tonight I will
investigate the differences among the OPAMPs.  So tomorrow I will be able
to hook a couple more emitters together & maybe even start building the
sensor circuit.  (This probably entails a visit to Supremetronics
tomorrow.)  One thought: I think it might be better to modulate the signal
at a really high frequency (ie 10+kHz or maybe even 40+kHz, since our
filters are just high pass filters and people are modulating their signals
at high freq -- ie if we modulate at 800Hz, our filter will pick up
anything over 800Hz, including the enemy signal possibly).  I could build
a bandpass filter but that gets complicated....

BTW, I think I may have made a mistake on the capacitor connections on the
motor.  Cindy, pls bring the motor tomorrow & I will fix it.  As well,
Cindy, I know most people are using toothed gears -- we don't have to do
what they are doing.  Belts are fine... (yes... Joyce finally succumbs to
the belt).  Moreover, I don't understand why people are using plastic
gears.  Just keep in mind that plastic cracks easily & wears out rather
quickly.  I worry about how the joint b/w the gear & the shaft will wear
out or fatigue.

Joyce :)