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nuckolls.bob(at)aeroelect
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 Posted: Sun Feb 02, 2014 8:49 am Post subject: 12V to 9V converter |
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| Quote: | Bob, I have an old (30+ years) Hall variometer that I want to put in my trike. It's powered by 9V batteries so it seems an easy enough project to use a converter to power it off the dynamo on the HKS engine. 2 amps should be more than enough output. There are quite a few vendors on eBay that offer them for $2 or so. Do you have any favorite vendors for this kind of thing?
Rick Girard |
What kind of 9v batteries? These things?
[img]cid:7.1.0.9.0.20140202104522.04eb35d8(at)aeroelectric.com.0[/img]
More than one? How many and do you KNOW
they are in parallel and not series for
+/- supply to the electronics?
Bob . . .
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Mon Feb 03, 2014 5:14 am Post subject: 12V to 9V converter |
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Bob, Yes, they are the standard 9V battery as you pictured. The vario has two, but they are switched so that only one is used at a time. Not much worse, at least in a hang glider, than being 40 miles out on a cross country flight and having your vario go down for a depleted battery.
Rick
On Sun, Feb 2, 2014 at 10:49 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: |
| Quote: | Bob, I have an old (30+ years) Hall variometer that I want to put in my trike. It's powered by 9V batteries so it seems an easy enough project to use a converter to power it off the dynamo on the HKS engine. 2 amps should be more than enough output. There are quite a few vendors on eBay that offer them for $2 or so. Do you have any favorite vendors for this kind of thing?
Rick Girard |
What kind of 9v batteries? These things?
[img]cid:7.1.0.9.0.20140202104522.04eb35d8(at)aeroelectric.com.0[/img]
More than one? How many and do you KNOW
they are in parallel and not series for
+/- supply to the electronics?
Bob . . .
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Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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http://www.matronics.com/Navigator?AeroElectric-List |
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nuckolls.bob(at)aeroelect
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| Posted: Mon Feb 03, 2014 5:23 am Post subject: 12V to 9V converter |
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At 07:07 AM 2/3/2014, you wrote:
| Quote: | | Bob, Yes, they are the standard 9V battery as you pictured. The vario has two, but they are switched so that only one is used at a time. Not much worse than being 40 miles out on a cross country flight and having your vario go down for a depleted battery. |
Okay. Devices that operate from this style of battery
don't take much current. Suggest you cobble this circuit
up on a piece of perf-board . . .
For 9v out, make R1 a FIXED 1500 ohm resistor. You won't
even need to heat sink the regulator. Both resistors can
be 1/4 watt or larger. Capacitors rated for 15v or more.
Radio Shack probably has all the parts you need . . .or I
can drop you a care-package . . .
Bob . . . [quote][b]
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Mon Feb 03, 2014 5:38 am Post subject: 12V to 9V converter |
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Bob, Thanks. For the purposes of learning a thing or two, I'll stop at RS this afternoon and pick up the parts. Looks like we're going to be house bound for a couple of days, if the weather guessers have it right, so a little project like this will be a welcome relief.
Rick
do not archive
On Mon, Feb 3, 2014 at 7:22 AM, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
| Quote: | At 07:07 AM 2/3/2014, you wrote:
| Quote: | | Bob, Yes, they are the standard 9V battery as you pictured. The vario has two, but they are switched so that only one is used at a time. Not much worse than being 40 miles out on a cross country flight and having your vario go down for a depleted battery. |
Okay. Devices that operate from this style of battery
don't take much current. Suggest you cobble this circuit
up on a piece of perf-board . . .
For 9v out, make R1 a FIXED 1500 ohm resistor. You won't
even need to heat sink the regulator. Both resistors can
be 1/4 watt or larger. Capacitors rated for 15v or more.
Radio Shack probably has all the parts you need . . .or I
can drop you a care-package . . .
Bob . . . | Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
|
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
[quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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etienne.phillips(at)gmail
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| Posted: Mon Feb 03, 2014 5:46 am Post subject: 12V to 9V converter |
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Hi Bob
You could also use an LM7809... It's the same as the LM317, but already set to 9V, and doesn't require the external resistor divider. Although I have used it fairly reliably without the input and output smoothing capacitors, I would still recommend putting them in to assure stability.
Thanks
Etienne
On 3 February 2014 15:22, Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
[quote] At 07:07 AM 2/3/2014, you wrote:
| Quote: | | Bob, Yes, they are the standard 9V battery as you pictured. The vario has two, but they are switched so that only one is used at a time. Not much worse than being 40 miles out on a cross country flight and having your vario go down for a depleted battery. |
Okay. Devices that operate from this style of battery
don't take much current. Suggest you cobble this circuit
up on a piece of perf-board . . .
For 9v out, make R1 a FIXED 1500 ohm resistor. You won't
even need to heat sink the regulator. Both resistors can
be 1/4 watt or larger. Capacitors rated for 15v or more.
Radio Shack probably has all the parts you need . . .or I
can drop you a care-package . . .
Bob . . . | Quote: |
ist" target="_blank">http://www.matronics.com/Navigator?AeroElectric-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
|
[b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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