The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
From: "Helmut Sennewald"
Subject: Re: How generate a 3phase sine wave ?
Date: Wed, 6 Nov 2002 23:18:30 +0100
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
"Sparky" schrieb im Newsbeitrag
> "john" wrote in message
> > Could anyone help? I have to generate a three phase sine wave signal
> > that composes of three component, with 120 degree phase different
> > between any two components. The frequency of it has to be adjustable,
> > say from 0Hz to 5Hz. The signal will be amplified for driving some
> > device. I have no idea to start at all, could anyone help and show me
> > some hints. Is there any commercial product available for such ?
> Easiest way is probably a microcontroller with 3 dacs.
> You need a sine lookup table, you only need the first quadrant values, the
> other three quadrants can be generated by inversions.
I fully agree up to here. The 3 DACs can be done easily by 3 PWM
(pulse width modulation) outputs of a single microcontroller chip.
The only extra hardware needed are 3 resistors plus 3 capacitors
to filter the digital PWM outputs.
Look for devices with 3 or more PWM channels.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup