The regulator on the Motorola alternator on my boat (>25 years old)
appears to use pulse width modulation to control the field current ...
at least, that's what it looks like on a 'scope
Larry
>----------
>From:  Peter Cousens[SMTP:peter@cousens.her.forthnet.gr]
>Sent:  Saturday, February 08, 1997 12:56 AM
>To:    PICLIST@MITVMA.MIT.EDU
>Subject:       Re: Battery Isolators (Totally Unrelated to PIC)
>
>(SNIP)
>Regulators normaly use two transistors a Zener diode
>one small cap (22n) and a few resistors
>and the output is set to 13.8V
>though a few are made for 14 or 14.2
>
>