[half] was spot on when he wrote of the difficulties of the perfect shave. To quote : ... it may take many passes over the same area to accomplish a close shave. Once the area is clean, there's no point in continuing to work on that area, but it's tough to tell when you're done, so extra time may be taken in that area.
[half]'s tactile razor is one potential solution and I now present another.
Additional circuitry is added to your electric shaver or battery operated wet shave razor. This buzzer circuit uses your wet skin to close the loop.
A perfect connection betwix skin and razor indicates a perfectly smooth, stubble-free surface which produces no sound. The rougher the skin, the worse the connection, the louder the noise.
Shave a spot until you can't hear it. An audibly cleaner shave.-- jonthegeologist, Oct 11 2004 Inspiration : [half]'s tactile razor system http://www.halfbake...20Feedback_20Shaver [jonthegeologist, Oct 11 2004] I liked it so much I bought the company. err- couldn't what you've suggested be achieved with a microphone close to the cutting edge ?-- neilp, Oct 12 2004 yes, of course, but that would be an unnecessarily simple solution.-- jonthegeologist, Oct 12 2004 What about a blood curdling screaming sound when you connect with the longer hairs.-- benfrost, Oct 12 2004 I like this. Now make an electric shaver that shaves properly and you're done.-- wagster, Oct 12 2004 [wagster], with a microphone, it needn't ben an electic razor (indeed that would be less than preferably).-- neilp, Oct 12 2004 random, halfbakery