Alt-BEAM Archive
Message #10983
To: beam@sgiblab.sgi.com
From: Bruce Robinson Bruce_Robinson@telus.net
Date: Sun, 27 Feb 2000 17:31:49 -0800
Subject: [alt-beam] Re: Schematics
Hi, Mike.
> ... On a schematic, which of the leads is the emitter and which is the
> collector?
Base is the middle. Emitter has the arrow. Collector has no arrow.
The arrow direction convention is often ignored these days, even by
manufacturers. Read the transistor number to be sure.
Arrow out = NPN
Arrow in = PNP
Regards,
Bruce
10984 Sun, 27 Feb 2000 17:51:32 -0800 Re: Diskette Drives "Mike Kulesza"
>
>
> >I was wondering if 3.5 in floppy drives used geared motors, i'm assuming
> >they
> >do, but i wanted to be sure before i destroyed something!
>
> None that I've seen. They use really flat, and wide motors for the main
disk
> rotor, and a stepper for the wand with the reader/recorder device on it.
>
> ______________________________________________________
>
10985 Sun, 27 Feb 2000 20:48:38 -0500 [alt-beam] Re:Diskette Drives alt-beam@egroups.com, "beam@sgiblab.sgi.com" David Simmons Most use a pair of stepper motors, a small 5v for the reader head and a larger
wieghted 5v motor for the main driver. There are plans on the internet,
somewhere, to turn a floppy drive into a small robot. Remember the motors are
steppers, they need a driver IC to run and draw a fair amount of amps. I haven't
seen any steppers used in BEAM so far--There is no motor feedback loop like what
is created with geared DC motors. However the small motors are great for CPU
robots or other projects.Often the main drive motor is part of the PCB and can
not be removed with out damage to the motor.
Regards,
Dave
BUDSCOTT@aol.com wrote:
> I was wondering if 3.5 in floppy drives used geared motors, i'm assuming they
> do, but i wanted to be sure before i destroyed something!
>
> -Spencer
>
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