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Voltage reducer

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jgamtmann2(at)gmail.com
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Posted: Fri Jul 17, 2015 3:27 pm Post subject: Voltage reducer

This is not aircraft related (but I do have an RV6) but is electronic related.  Many years ago I converted an old Porsche 356 from 6V to 12V.  There were no 12V windshield wiper motors available so I had to use the original 6V wiper motor which drew about 5-10A.  Speed was controlled with a rheostat, but adding another dropping resistor generated heat and made the speed control ineffective.  Someone assembled a transistor circuit for me that dropped the 12V supply to a constant 6V (independent of current draw) and everything worked well.  I am now restoring this car and this device became lost.  Does anyone of you electronic experts (maybe Bob N) know of a circuit I can build or purchase a device that will give me the constant 6V at 5 or 10A?



Jurgen Amtmann



  [quote][b]

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user9253

Joined: 28 Mar 2008
Posts: 1927
Location: Riley TWP Michigan

Posted: Fri Jul 17, 2015 6:57 pm Post subject: Re: Voltage reducer

Search for PWM Motor Speed Controller.  Maybe something like this will work:

http://www.ebay.com/itm/9-60V-40A-DC-Motor-Speed-Control-PWM-HHO-RC-Controller-12V-24V-48V-1500W-MAX-/261421453931?pt=LH_DefaultDomain_0&hash=item3cddeed26b

The rated capacity of some items from China are exaggerated, so get 2 or 3 times the expected load capacity.

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_________________
Joe Gores

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Jul 18, 2015 10:21 am Post subject: Voltage reducer

At 09:57 PM 7/17/2015, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com>



 Search for PWM Motor Speed Controller.  Maybe something like this will work:

  http://www.ebay.com/itm/9-60V-40A-DC-Motor-Speed-Control-PWM-HHO-RC-Controller-12V-24V-48V-1500W-MAX-/261421453931?pt=LH_DefaultDomain_0&hash=item3cddeed26b 

 The rated capacity of some items from China are exaggerated, so get 2 or 3 times the expected load capacity.

 	


   I've used several similar products and they seemed to

   be of good value. You will want to limit the 'travel'

   on the control potentiometer such that output never

   exceeds 7v on a 14v system. The stock controller will

   allow output all the way up to what ever the bus

   voltage is.



   You can do this with a mechanical stop on a pointer

   knob . . . or perhaps add a resistor in series with

   the potentiometer body such that full travel on

   the pot represents only 1/2 of the original electrical

   travel.



 

 

   Bob . . .    [quote][b]

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