Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10 beta 3/9/83; site sunrise.UUCP
Path: utzoo!linus!philabs!sunrise!jgc
From: jgc@sunrise.UUCP (Jim Constantine)
Newsgroups: net.auto,net.audio
Subject: Re: How do you get 60W out of a car stereo with 12 V????
Message-ID: <118@sunrise.UUCP>
Date: Wed, 12-Oct-83 13:56:51 EDT
Article-I.D.: sunrise.118
Posted: Wed Oct 12 13:56:51 1983
Date-Received: Fri, 14-Oct-83 07:55:54 EDT
References: <617@eisx.UUCP>
Organization: Sun Microsystems NY Office
Lines: 17

There are basically two methods for obtaining higher power outputs :

1) for intermediate power 7-20 W, Use what is called a "bridge" amplifier.
   They work like this :

   input
   ----.---{ 180 deg. phase shift}-------{amp}-------|
       |                                             |   /
       |                                            |---/   speaker
       |                                            |---\
       |                                             |   \
       ----------------------------------{amp}-------|

   Note: neither side of the speaker is connected to ground.
   
2) For large power outputs a power inverter is neccessary to convert
   the +13.5VDC input voltage to something larger, usually  + and - 35VDC.