Electronics Forum / Basics / May 2007

Fourier Transform is difficult for me. How can i practic this?

How do you make if very difficult for someone to figure out the
schematic and components parts of a pcb circuit?
Is there an encapsulation compound that is so tough no-one would
bother breaking it up to analyse the circuit?  Are there any other

I am using a Logitech/Labtech USB microphone which is doing an okay
job but could benefit from some more gain. I don't want to touch their
ADC and USB circuit but would prefer adding something in-line. Given
that their 2-wire electret micro is powered by 2.5v on the signal line

Does anyone make a 90 degree stepper or oscillator motor.  Need
something that will swing 90 degrees at 90 Hz.