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Voltage regulator/dropper

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Phil White

Joined: 10 Jan 2006
Posts: 45
Location: Downers Grove, IL

Posted: Sun Jun 06, 2010 7:34 pm Post subject: Voltage regulator/dropper

I have built a timer kit for my transfer fuel pump (CK158B from 

CanaKit.com) that works as desired.  The directions indicate that it 

should be powered by 9 Vdc supply or a 12 Vdc 'regulated' supply.  I my 

electrically dependent plane, I will be using 2 AGM batteries powered by 

2 alternators (55A from Geo Metro) converted to external Ford regulators.

    I need to build a circuit to drop the 13 to 15 Volts to 9-12 volts, 

so as to not zap the HEF4541BP timer IC or 9V relay coil.  On my lab 

supply, the ammeter doesn't register any perceptible current (it can 

show as little as 0.1 amp) while the timer is running with the relay 

energized, so I don't know the actual current draw of the timer.



Can you suggest a regulator circuit that will drop the extra 4-5 volts, 

and keep the electronics from frying?



Phil in IL, RV-10 w/20B Mazda

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icrashrc

Joined: 16 Mar 2006
Posts: 247
Location: Mishawaka, In

Posted: Mon Jun 07, 2010 2:38 am Post subject: Re: Voltage regulator/dropper

Here's an option.



http://www.castlecreations.com/products/ccbec.html



I think 9 volts is as high as you can set these but you will need their data cable to do so. I have the needed software and cable and would be happy to set it for you.

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_________________
Scott

www.ill-EagleAviation.com

do not archive

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jun 07, 2010 6:02 am Post subject: Voltage regulator/dropper

 	  Quote: 	
		  	
 

 At 10:32 PM 6/6/2010, you wrote:

 --> AeroElectric-List message posted by: Phil <philwhite9(at)aol.com>



 I have built a timer kit for my transfer fuel pump (CK158B from CanaKit.com) that works as desired.  The directions indicate that it should be powered by 9 Vdc supply or a 12 Vdc 'regulated' supply.  I my electrically dependent plane, I will be using 2 AGM batteries powered by 2 alternators (55A from Geo Metro) converted to external Ford regulators.

    I need to build a circuit to drop the 13 to 15 Volts to 9-12 volts, so as to not zap the HEF4541BP timer IC or 9V relay coil.  On my lab supply, the ammeter doesn't register any perceptible current (it can show as little as 0.1 amp) while the timer is running with the relay energized, so I don't know the actual current draw of the timer.



 Can you suggest a regulator circuit that will drop the extra 4-5 volts, and keep the electronics from frying?



 

     See:  http://aeroelectric.com/Pictures/Schematics/Accessory_Regulator.pdf 



     This circuit can be built in a variety of 'sizes'

     depending on your current demands. The LM317 is

     good for up to 1.5A on a sufficient heat sink.

     In your case, you probably don't need any heat

     sink.  Looking at the product you're integrating

     into your airplane . . .



 [img]cid:7.1.0.9.0.20100607085552.0200d548(at)aeroelectric.com.0[/img] 



    It appears that there would be room on the

    bottom of the board to bond an LM317 right

    to the ECB and wire the rest of the components

    to it . . . also tacking them to the board

    with E6000 to avoid vibration breakage of

    the leads. Thus you modify the existing

    assembly to run from the aircraft bus as

    opposed to adding another black box to condition

    power for this one accessory.



 

   Bob . . .

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etienne.phillips(at)gmail
Guest

Posted: Mon Jun 07, 2010 6:43 am Post subject: Voltage regulator/dropper

Hi Bob



Instead of the LM317 (which requires the use of tuning resistors), what about using an LM7809? It's almost identical to the LM319, but without the variable output option - it's preset to 9V. Also good for 1A, with adequate heat sink, and has all the niceties of overheat protection etc.

 

I've used the 7805 (the 5V variety of the 78xx family) for many land-based projects with great success. Is there maybe an excluding property that makes them unsuitable for aviation applications that I haven't encountered?

 

Thanks

Etienne



On 7 June 2010 16:03, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:

  	  Quote: 	
		     	  Quote: 	
		  	
 

 At 10:32 PM 6/6/2010, you wrote:

 --> AeroElectric-List message posted by: Phil <philwhite9(at)aol.com (philwhite9(at)aol.com)>



 I have built a timer kit for my transfer fuel pump (CK158B from CanaKit.com) that works as desired.  The directions indicate that it should be powered by 9 Vdc supply or a 12 Vdc 'regulated' supply.  I my electrically dependent plane, I will be using 2 AGM batteries powered by 2 alternators (55A from Geo Metro) converted to external Ford regulators.

    I need to build a circuit to drop the 13 to 15 Volts to 9-12 volts, so as to not zap the HEF4541BP timer IC or 9V relay coil.  On my lab supply, the ammeter doesn't register any perceptible current (it can show as little as 0.1 amp) while the timer is running with the relay energized, so I don't know the actual current draw of the timer.



 Can you suggest a regulator circuit that will drop the extra 4-5 volts, and keep the electronics from frying?



 



     See:  http://aeroelectric.com/Pictures/Schematics/Accessory_Regulator.pdf 



     This circuit can be built in a variety of 'sizes'

     depending on your current demands. The LM317 is

     good for up to 1.5A on a sufficient heat sink.

     In your case, you probably don't need any heat

     sink.  Looking at the product you're integrating

     into your airplane . . .



 [img]cid:7.1.0.9.0.20100607085552.0200d548(at)aeroelectric.com.0[/img] 



    It appears that there would be room on the

    bottom of the board to bond an LM317 right

    to the ECB and wire the rest of the components

    to it . . . also tacking them to the board

    with E6000 to avoid vibration breakage of

    the leads. Thus you modify the existing

    assembly to run from the aircraft bus as

    opposed to adding another black box to condition

    power for this one accessory.



 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Mon Jun 07, 2010 9:19 am Post subject: Voltage regulator/dropper

At 09:21 AM 6/7/2010, you wrote:

 	  Quote: 	
		  Hi Bob



Instead of the LM317 (which requires the use of tuning resistors), 

what about using an LM7809? It's almost identical to the LM319, but 

without the variable output option - it's preset to 9V. Also good 

for 1A, with adequate heat sink, and has all the niceties of 

overheat protection etc.



I've used the 7805 (the 5V variety of the 78xx family) for many 

land-based projects with great success. Is there maybe an excluding 

property that makes them unsuitable for aviation applications that I 

haven't encountered?



Thanks

Etienne


	


   Good choice. I tend to "jump" on the LM317 because of it's

   broad applicability and we stock the part. But a fixed

   voltage regulator from the 78xx family is certainly

   an option that eliminates a couple of resistors.



   Bob . . .

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