RE: [T3] wiper motors

[Russell Wolfe <russella@netins.net>]

How about using the 12v regulator to drive a darlington pair on a heat sink?
You would want to include some current limiting, due to the fact that wiper
blades get frozen to the windshield in the winter, and the wiper shafts do
seize up if not lubricated properly.

--
Russ Wolfe
http://www.wolfenet.net


On Wed, 14 Jun 2000, Oliver Parker wrote:
> For anyone that cares.  I am currently working on a solid state voltage 
> regulator to solve the wiper motor voltage drop for a friend. When finished 
> I am hoping to be in the $10 range for parts.  The major problem I am coming 
> across is that none of the inexpensive off the shelf voltage regulators can 
> handle more than 1.25 amps.  So it is looking like a dual regulator setup (a 
> little more complex to wire up).  When I get it working (and some hours on 
> it) I will let everyone know.
> 
> -Ollie
> 
> 
> >From: "Jim Adney" <jadney@vwtype3.org>
> >Reply-To: jadney@vwtype3.org
> >To: <type3@vwtype3.org>
> >Subject: RE: [T3] wiper motors
> >Date: Tue, 13 Jun 2000 21:58:31 -0600
> >
> >On 13 Jun 00, at 22:24, Andrew Riley wrote:
> >
> > > fitted a voltage drop to a 6v motor to power it from 12v - disasterous 
> >is
> > > the only word for it - don't bother too slow
> >
> >Done the cheap way, with a resistor, will never work quite right.
> >Done with solid state linear voltage regulation (really not hard) it
> >should work perfectly. This will waste a LOT of power that will have
> >to be dissipated on a heat sink somewhere, however.
> >
> >The RIGHT way to do this would be with PWM (pulse width modulation)
> >which should also work well and waste very little power. I don't know
> >if anyone makes such a device, but they should.
> >
> >-
> >*******************************
> >Jim Adney, jadney@vwtype3.org
> >Madison, Wisconsin, USA
> >*******************************
> >
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