Today's Message Index:
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1. 02:20 PM - Re: Some Thoughts on Z101 (prestonkavanagh)
2. 03:05 PM - Re: Re: Some Thoughts on Z101 (Charlie England)
3. 08:20 PM - Poor Man's Battery Tester (Roger Evenson)
Message 1
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| Subject: | Re: Some Thoughts on Z101 |
This has turned into a thread on alternative ways of providing a brownout bus.
As discussed in the past, we don't necessarily need one. Accepting that my Garmin
GPS-Comm might cutout on startup, and that there are situations where this
would be inconvenient, in my Z101 design I'm including a booster (see attached
photos). I built two small boxes and both work. Now I pick one and decide
whether to brown-out protect a circuit or add a small brownout bus. Yes, I
should add a diode. Other comments? Skip this complication entirely?
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PBK3
PA-12, BD-4, RV6a, gliders
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=500465#500465
Attachments:
http://forums.matronics.com//files/boost2_166.png
http://forums.matronics.com//files/boost1_133.png
Message 2
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| Subject: | Re: Some Thoughts on Z101 |
On Fri, Jan 29, 2021 at 4:25 PM prestonkavanagh <preston.kavanagh@gmail.com>
wrote:
> preston.kavanagh@gmail.com>
>
> This has turned into a thread on alternative ways of providing a brownout
> bus. As discussed in the past, we don't necessarily need one. Accepting
> that my Garmin GPS-Comm might cutout on startup, and that there are
> situations where this would be inconvenient, in my Z101 design I'm
> including a booster (see attached photos). I built two small boxes and
> both work. Now I pick one and decide whether to brown-out protect a
> circuit or add a small brownout bus. Yes, I should add a diode. Other
> comments? Skip this complication entirely?
>
> --------
> PBK3
> PA-12, BD-4, RV6a, gliders
>
> Have you tested the 'dual' version for proper boost operation? The data
sheet hints that it is a buck converter; not boost.
As to whether to include brownout: If there's no delay, or the delay in
bootup of your installed devices isn't inconvenient, then don't install
one. I had hoped that a new battery would solve my issue, but it didn't. I
installed one because my older EFIS equipment requires several minutes to
fully boot, and often will 'lock up' during cranking, requiring me to shut
off the entire airframe to enable a re-start of the EFIS equipment. Livable
in winter, but in summer, it just wastes fuel to sit idling so long.
(Almost all my flying is from uncontrolled fields, so clearance delivery
isn't a factor for me.)
Charlie
Message 3
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| Subject: | Poor Man's Battery Tester |
I built Bob's "Poor Man's Battery Capacity Tester".
Somehow I got the impression the relay would 'drop' out and thus turn off
the lamp and clock when the battery reached about 10V. But after
re-reading "Battery Replacement: A Plan for Throwing in the Towel", that
expectation is not written there. My experience has been that it turns
off when the battery reaches about 4V.
Odyssey Load Test Procedure and Reconditioning Procedures recommend ending
the test at 10V. I've done this, but it requires my presence when the
battery nears 10V.
Is there a way to modify this circuit so that it will 'turn off' when the
battery reaches 10V?
Or, is there a commercially available tester that would load a battery at 4
amps and record the time required until the battery reaches 10V?
Roger.
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