VansAirForceForums  
Home > VansAirForceForums

- POSTING RULES
- Donate yearly (please).
- Advertise in here!

- Today's Posts | Insert Pics

  #1  
Old 08-24-2009, 02:04 PM
Bob Hoffman Bob Hoffman is offline
 
Join Date: Jan 2005
Posts: 206
Default converting 12v to 9v

I have an ANR headset that have the ANR portion powered by a 9v battery pack,the cord has a little plug that plugs into the battery case.

Now,bearing in mind that I'm not an electrican,what do I need to do to convert the aircraft 12v power to a 9v plug so I can eliminate the battery pack.

I was thinking of putting a receptacle next to the head set jacks.

I have a "tilt" so I'm putting the jacks in the rollbar support where the rear window is.

A suggested sorce for the required parts would also be appreciated.

Thanks
Bob
Reply With Quote
  #2  
Old 08-24-2009, 02:12 PM
Mel's Avatar
Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
Default

Bob,
Go down to the aviation section of your nearest Radio Shack and get a 9v converter. Hard wire this in and put a jack next to your headset jacks. I tied mine in to the avionics master so it turns off the headsets when I turn off the AV master.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>

Last edited by Mel : 08-24-2009 at 05:32 PM.
Reply With Quote
  #3  
Old 08-24-2009, 02:35 PM
nucleus nucleus is offline
 
Join Date: Sep 2006
Location: Bozeman, Montana
Posts: 858
Default Another way would be to...

call up your headset manufacturer and get a lemo conversion kit. About $150 for the Bose.

Hans
__________________
Dr. Hans Conser
Bozeman Chiropractor
RV-6A 195 Hours, up for sale soon?
Reply With Quote
  #4  
Old 08-24-2009, 02:50 PM
Mike S's Avatar
Mike S Mike S is offline
Senior Curmudgeon
 
Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
Default

Agree, contact mfg.

My Headsets Inc. units have a built in power option, regulated power that will drive 2 headsets.

Less than $40
__________________
Mike Starkey
VAF 909

Rv-10, N210LM.

Flying as of 12/4/2010

Phase 1 done, 2/4/2011

Sold after 240+ wonderful hours of flight.

"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
Reply With Quote
  #5  
Old 08-24-2009, 02:53 PM
roee roee is offline
 
Join Date: Feb 2006
Location: San Diego, CA, U.S.A.
Posts: 770
Default LM7809

A 9V linear regulator would be a very simple solution. The LM7809 is a 3-pin device that will take anywhere from about 11V to 35V input and give you a clean 9V output up to about 1A in a TO-220 package. The LM7809 has been around since the dinosaurs walked the earth, it is made by multiple manufacturers, should cost less than a buck, is available from online distributors such as Digikey, and probably even at Radio Shack (Mel, is that what you used?).
__________________
Roee Kalinsky
San Diego, CA, U.S.A.
RV-7A under construction
www.kalinskyconsulting.com/rvproj/
Reply With Quote
  #6  
Old 08-24-2009, 06:18 PM
deene deene is offline
 
Join Date: Jan 2005
Location: Georgetown, TX
Posts: 396
Default

Yep, the 7809 works fine (7810 is actually better as a 9.6v supply) and with two additional caps (0.1 and 1uf), you've got a $3 solution. Solder the caps together directly on the regulator with pigtail leads and shrink wrap the whole thing.

And at the low power levels needed, the linear regulator is quiet and works very well.

I have built many of these for friends and their ANR headsets as a ships power unit. Order the right mini jack for the deal and install in less than one hour.

If anyone wants to not deal with the solder, I'll send you one built for $20 ($30 with the jack which you need to specify for your headset).
__________________
Deene Ogden.
N399AD RV-12...flying
N299AD RV8 QB, IO-390X, BA prop...SOLD
N199AD One Design...SOLD
N99AD BD4, flew for 22 years...SOLD
EAA Tech Counselor/Flight Advisor
CFII, MEI, CFIG
Reply With Quote
  #7  
Old 08-25-2009, 12:58 PM
Bob Hoffman Bob Hoffman is offline
 
Join Date: Jan 2005
Posts: 206
Default

Thank you all for your responses.
Deene -- what are caps (0.1 & 1uf) ??? what do they do ?
Thanks again
Bob
P.S. Is a 9V battery 9V or 9.6V ? (do I need the LM7809 or the LM7810)?
Reply With Quote
  #8  
Old 08-25-2009, 03:27 PM
roee roee is offline
 
Join Date: Feb 2006
Location: San Diego, CA, U.S.A.
Posts: 770
Default

Quote:
Originally Posted by Bob Hoffman View Post
Deene -- what are caps (0.1 & 1uf) ??? what do they do ?
Capacitors. Adding input and output capacitors as Deene suggests helps clean up the signal even further, and in some cases is necessary for stability of the regulator. In this application you could probably do ok without them, but adding them is certainly a good idea.

See Figure 7 in the LM7809 datasheet: http://www.fairchildsemi.com/ds/LM/LM7809.pdf

Bob, if you're not electronically inclined, consider taking Deene up on his offer to sell you a complete circuit.

Quote:
Originally Posted by Bob Hoffman View Post
P.S. Is a 9V battery 9V or 9.6V ? (do I need the LM7809 or the LM7810)?
What type of battery is it exactly? An alkaline 9V battery really is nominally approximately 9V (six cells, ~1.5V per cell). A rechargeable battery pack composed of eight NiCd or NiMH cells (~1.2V each) would be more like 9.6V nominally. In either case, there will be quite a bit of variation in battery voltage depending on load and decreasing as the battery discharges. Battery powered devices are therefore generally designed to accommodate a wide variation in input voltage. What really matters is what is the input voltage range that your headset requires? Anywhere within that range should be fine.
__________________
Roee Kalinsky
San Diego, CA, U.S.A.
RV-7A under construction
www.kalinskyconsulting.com/rvproj/

Last edited by roee : 08-25-2009 at 03:29 PM.
Reply With Quote
  #9  
Old 01-27-2010, 07:11 PM
Ken9 Ken9 is offline
 
Join Date: Sep 2006
Location: Milwaukee Wi. area
Posts: 50
Default ken9

I am wiring this elcheapo 9v power supply for my Headsets Inc. ANR. Can anyone tell me where to get the correct mini jacks for the system?
Reply With Quote
  #10  
Old 01-27-2010, 07:22 PM
Mel's Avatar
Mel Mel is offline
 
Join Date: Mar 2005
Location: Dallas area
Posts: 10,769
Default

The aviation aisle at Radio Shack. Assuming that it's a standard 1/8" jack.
__________________
Mel Asberry, DAR since the last century.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
<rvmel(at)icloud.com>
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -6. The time now is 07:29 AM.


The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.