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From: bill@videovax.tv.tek.com (William K. McFadden)
Newsgroups: rec.ham-radio,sci.electronics
Subject: Re: Making a clodk go at twice the normal speed.
Message-ID: <6027@videovax.tv.tek.com>
Date: 24 Aug 90 16:08:00 GMT
References: <1990Jun7.141107.6790@bnrgate.bnr.ca> <1990Aug23.173721.7942@arnor.uucp>
Reply-To: bill@videovax.tv.tek.com (William K. McFadden)
Followup-To: rec.ham-radio
Organization: Tektronix TV Measurement Systems, Beaverton OR
Lines: 20

The easiest way to do this is to run a variable sinewave oscillator (e.g.,
audio gernerator) into an audio power amplifier.  Connect a standard AC wall
clock to the amplifier's output.  With the frequency set to 60 Hz, gradually
increase the amplitude until the clock seems to be running normally (or use a
voltmeter to set the voltage to 120 VAC).  To change the speed of the clock,
vary the frequency.

You will need to use a PA amplifier with a 70V output, since the 8 ohm outputs
on regular amplifiers don't put out enough voltage.  If all you have is an 8
ohm amplifier, you can get a transformer from Radio Shack for about $5 that
adapts the 8 ohm output to 70 volts.

BTW, I have heard stories of coworkers doing this to chronic clock watchers.
They would set the clock to run slightly fast or slightly slow, being sure to
vary it a little every day.  Drives 'em nuts!
-- 
Bill McFadden    Tektronix, Inc.  P.O. Box 500  MS 58-639  Beaverton, OR  97077
bill@videovax.tv.tek.com,     {hplabs,uw-beaver,decvax}!tektronix!videovax!bill
Phone: (503) 627-6920       "The biggest difference between developing a missle
component and a toy is the 'cost constraint.'" -- John Anderson, Engineer, TI