Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!ncs.dnd.ca!uupsi!cmcl2!yale!think!zaphod.mps.ohio-state.edu!uakari!ames!elroy.jpl.nasa.gov!peregrine!ccicpg!cci632!rdi
From: rdi@cci632.UUCP (Rick Inzero)
Newsgroups: sci.electronics
Subject: Re: Need Scematics for DC Motor Speed Control.
Summary: Please post if you can help
Keywords: Speed Control
Message-ID: <34597@cci632.UUCP>
Date: 23 Feb 90 15:15:50 GMT
References: <3609@tahoe.unr.edu>
Reply-To: rdi@ccird3.UUCP (Rick Inzero)
Distribution: usa
Organization: Computer Consoles Inc. an STC Company, Rochester, NY
Lines: 32

In article <3609@tahoe.unr.edu> isaac-b@tahoe.unr.edu (Benjamin Isaac) writes:
>I have had a lot of problems locating a decent schematic for a speed controler
>for a cordless drill.
>  
>The type of schematics I am looking for is one that:
> 
>       1. DOESN'T use a transitor/resistor design (i.e. heat/excessive drain).
>       2. doesnt require extremely hard to find components.
>       3. can handle around 1amp at 6volts.
>       4. will hopefully have some torque at lower speeds. 
> 
>I would appreciate any help through e-mail or through this newsgroup.
>
>net: isaac-b@tahoe.unr.edu 
> 

If anyone has a good, tried-and-true circuit for this, I'd be interested 
in seeing it posted too!  

I've found a "Speed Control for Power Tools" schematic in the Feb. 1967
Popular Science (plus a correction on p. 10 of Apr 1967), but is uses
resistors and a mechanical contact set up that would be difficult to
make from scratch.  Hey, at least it matches the age of my electric drill!!

---
Rick Inzero					rochester!cci632!rdi
Computer Consoles Inc. (CCI)			uunet!ccicpg!cci632!rdi
Rochester, NY					uunet!rlgvax!cci632!rdi

"Your grandmother never, ever called me stupid.  
	She always called me 'pinhead'." -Jimmy Stewart in 1988 Campbells Soup
								commercial.