- on Audio/Video/Photography
- Published in issue 7/2007 on page 0
Stepped Volume Control
Louder music, sirens or speech in response to higher ambient noise levels? This simple circuit has the answer, and it may enable your robot to be at least as noisy or loudmouthed as the others in an arena.
Then circuit consists basically of a microphone, a level detector, a 4-state counter and four analogue switches connected to a resistive ladder network.