stop, a set of contacts is opened. This disconnects the current allowing the
armature and disc to return under spring tension. The whole process keeps
repeating when the horn switch is on. The frequency of movement and hence
the fundamental tone is arranged to lie between 1.8 and 3.5 kHz. This gives
good penetration through trafc noise. Twin horn systems, which have a high
and low tone horn, are often used. This produces a more pleasing sound but is
still very audible in both town and higher speed conditions. Figure 11.21 shows
two typical horns and with the associated circuit is Figure 11.22.
11.3.2 Engine cooling fan motors ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month, and much more.
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.
Julian F.
Head of Cybersecurity
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.
Addison B.
Field Engineer
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.
Amir M.
Data Platform Tech Lead
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.