11-1 is designed to track the gradually-rising charge voltage in the capacitor of 555-B, and to output the inverse of this curve as a modulation ... The result is that each bark has a characteristic rise in pitch, sounding more like an animal aquot;yelpaquot; than an electronic beep. ... The Audigen circuit output is fed either into an integrated circuit or discrete transistor audio amplifier, which in turn drives a small 8-ohmanbsp;...
|Title||:||How to Build Your Own Working Robot Pet|