Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!zaphod.mps.ohio-state.edu!unix.cis.pitt.edu!fmgst
From: fmgst@unix.cis.pitt.edu (Filip Gieszczykiewicz)
Newsgroups: sci.electronics
Subject: Re: Making a clodk go at twice the normal speed.
Message-ID: <31301@unix.cis.pitt.edu>
Date: 24 Aug 90 05:56:35 GMT
Reply-To: fmgst@unix.cis.pitt.edu (Filip Gieszczykiewicz)
Organization: The Last Jedi
Lines: 31


	Greetings. I needed a clock to go 2 X the normal
	speed. Quite simple.

	Typical "Quartz" clock consists of:

	1) p.c. boards with a resistor, crystal, IC, variable cap
	(minor adjustment), and 1 or 2 diodes (battery polarity
	protection).

	2) coil that drives a small magnetic wheel (2 pole motor?)

	3) Various gears to "derive" the minutes and hours.

	
	All I did was take a NE555 (timer chip) and set it
	to pulse 2 times per second. I connected the output
	of the 555 to a transistor that drove the coil.

	It work's just fine. (you can set the speed to anything!)

	Take care.

	P.S. Now, getting the clock to go BACKWARDS is an "adventure"
	(with a quartz, anyways.... :-)	

-- 
_______________________________________________________________________________
"The Force will be with you, always." It _is_ with me and has been for 10 years
Filip Gieszczykiewicz    "A man without a dream is like a fish without water."
FMGST@PITTVMS  or  fmgst@unix.cis.pitt.edu "My ideas. ALL MINE!!"