Today's Message Index:
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1. 08:57 AM - Re: Battery capacity tester- Why isn't there a flyback diode? (user9253)
2. 09:21 AM - Re: Battery capacity tester-was flyback diode, now clock source (Mark Todd)
3. 09:38 AM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Robert L. Nuckolls, III)
4. 10:56 AM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Roger & Jean)
5. 11:02 AM - jumpimg gauge needles (bob noffs)
6. 11:23 AM - Re: Re: Battery capacity tester-was flyback diode, now clock source (JOHN TIPTON)
7. 11:59 AM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Bill)
8. 01:02 PM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Robert L. Nuckolls, III)
9. 01:06 PM - Re: jumpimg gauge needles (Robert L. Nuckolls, III)
10. 02:15 PM - Re: jumpimg gauge needles (bob noffs)
11. 03:22 PM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Robert L. Nuckolls, III)
Message 1
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| Subject: | Re: Battery capacity tester- Why isn't there a flyback |
diode?
A quartz clock with hands can be used instead of an AC powered clock. Strip the
ends of two wires. Flatten the ends with a hammer and anvil. Make a sandwich
of the two flattened wires with a paper or plastic insulator between them.
Place this sandwich in the clock battery holder between the AA battery and a
holder contact. Connect the other ends of the two wires to the tester relay.
Joe
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=404970#404970
Message 2
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| Subject: | Re: Battery capacity tester-was flyback diode, now |
clock source
> From: "Eric M. Jones" <emjones@charter.net>
>
>
> There probably should be a "flyback" diode there. Actually I've been searching
> the antique shops for an AC plug-in clock and haven't been able to find one.
I went ahead and added the coil diode per yours and Bob's advice. As for
the clock, I gave up on finding an AC clock. I didn't want an AC
dependent time piece anyway. I just piggy-backed an 8V regulator
(MC7808C) I had on hand and a couple of resistors for a voltage divider
to give me a regulated 1.8 volt supply that seems to work just fine with
the quartz clock I got at Goodwill for $1.
Boy, that 55W light bulb sure gets warm after a few minutes. I bet a
big ol' heat sink and a surplus computer cooling fan would probably
extend bulb life. Back to the workbench!
Mark
Message 3
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| Subject: | Re: Battery capacity tester-was flyback diode, |
now clock source
>I went ahead and added the coil diode per yours and Bob's advice. As
>for the clock, I gave up on finding an AC clock. I didn't want an
>AC dependent time piece anyway. I just piggy-backed an 8V regulator
>(MC7808C) I had on hand and a couple of resistors for a voltage
>divider to give me a regulated 1.8 volt supply that seems to work
>just fine with the quartz clock I got at Goodwill for $1.
Good workaround . . .
>Boy, that 55W light bulb sure gets warm after a few minutes. I bet
>a big ol' heat sink and a surplus computer cooling fan would
>probably extend bulb life. Back to the workbench!
Yeah, they do. Not sure how you would heat sink
it . . . most of the energy is radiated. But a fan
would help. A salvaged 12v cooling fan from a computer
should be low-cost option. The one I'm finishing up
on the bench has 3 lamps. Let me know how the fan
thingy works out for you. I might just do the same
thing with this one.
Bob . . .
Message 4
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| Subject: | Re: Battery capacity tester-was flyback diode, |
now clock source
>>Boy, that 55W light bulb sure gets warm after a few minutes. I bet a big
>>ol' heat sink and a surplus computer cooling fan would probably extend
>>bulb life. Back to the workbench!
>
> Yeah, they do. Not sure how you would heat sink
> it . . . most of the energy is radiated. But a fan
> would help. A salvaged 12v cooling fan from a computer
> should be low-cost option. The one I'm finishing up
> on the bench has 3 lamps. Let me know how the fan
> thingy works out for you. I might just do the same
> thing with this one.
I understood that these lamps were designed to work for many
100's of hours without any form of cooling, other than ambient air.
If this is the case, then I do not see much advantage in going to
the
$effort$ of adding extra cooling. Please correct me if I am wrong.
Roger
Message 5
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| Subject: | jumpimg gauge needles |
i know this has come up before but i can't find it. a friend with a 912 has
the needles on his falcon engine gauges jumping and twitching while engine
is running. are there places to look at to fix this? he has been told to
run wire from regulator to battery terminal, not just to bus. anything else
come to mind?
bob noffs
Message 6
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| Subject: | Re: Battery capacity tester-was flyback diode, |
now clock source
What's a 'fly-back' diode
John
----- Original Message -----
From: "Roger & Jean" <mrspudandcompany@verizon.net>
Sent: Saturday, July 20, 2013 6:55 PM
Subject: Re: AeroElectric-List: Re: Battery capacity tester-was flyback
diode, now clock source
> <mrspudandcompany@verizon.net>
>
>>>Boy, that 55W light bulb sure gets warm after a few minutes. I bet a big
>>>ol' heat sink and a surplus computer cooling fan would probably extend
>>>bulb life. Back to the workbench!
>>
>> Yeah, they do. Not sure how you would heat sink
>> it . . . most of the energy is radiated. But a fan
>> would help. A salvaged 12v cooling fan from a computer
>> should be low-cost option. The one I'm finishing up
>> on the bench has 3 lamps. Let me know how the fan
>> thingy works out for you. I might just do the same
>> thing with this one.
>
>
> I understood that these lamps were designed to work for many
> 100's of hours without any form of cooling, other than ambient air.
> If this is the case, then I do not see much advantage in going to
> the
> $effort$ of adding extra cooling. Please correct me if I am wrong.
>
> Roger
>
>
>
Message 7
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| Subject: | Re: Battery capacity tester-was flyback diode, |
now clock source
That was my question John!
I found this:
http://en.wikipedia.org/wiki/Flyback_diode
Bill
On Sat, Jul 20, 2013 at 11:22 AM, JOHN TIPTON <jmtipton@btopenworld.com>wrote:
> jmtipton@btopenworld.com>
>
> What's a 'fly-back' diode
>
> John
Message 8
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| Subject: | Re: Battery capacity tester-was flyback diode, |
now clock source
> I understood that these lamps were designed to work for many
> 100's of hours without any form of cooling, other than ambient air.
> If this is the case, then I do not see much advantage in going to the
> $effort$ of adding extra cooling. Please correct me if I am wrong.
Oh sure. Those are quartz-glass envelopes high
temperature materials elsewhere. They're in no
'danger' for operating uncooled.
Bob . . .
Message 9
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| Subject: | Re: jumpimg gauge needles |
At 01:01 PM 7/20/2013, you wrote:
>i know this has come up before but i can't find it. a friend with a
>912 has the needles on his falcon engine gauges jumping and
>twitching while engine is running. are there places to look at to
>fix this? he has been told to run wire from regulator to battery
>terminal, not just to bus. anything else come to mind?
>
Does the jumping stop with the alternator
OFF?
Can you describe the architecture of his
ground system? Do all the gauges wiggle
or just some . . . and what do they display.
Are there oil, coolant or fuel SENSORS
that ground locally . . . in others words
ground where they mount and then carry their
data off on a single wire?
Bob . . .
Message 10
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| Subject: | Re: jumpimg gauge needles |
bob, i know the answer to some of your questions but i will track down
arnie and get answers for them all and get back to you.
bob noffs
On Sat, Jul 20, 2013 at 3:05 PM, Robert L. Nuckolls, III <
nuckolls.bob@aeroelectric.com> wrote:
> nuckolls.bob@aeroelectric.com**>
>
>
> At 01:01 PM 7/20/2013, you wrote:
>
>> i know this has come up before but i can't find it. a friend with a 912
>> has the needles on his falcon engine gauges jumping and twitching while
>> engine is running. are there places to look at to fix this? he has been
>> told to run wire from regulator to battery terminal, not just to bus.
>> anything else come to mind?
>>
>>
> Does the jumping stop with the alternator
> OFF?
>
> Can you describe the architecture of his
> ground system? Do all the gauges wiggle
> or just some . . . and what do they display.
> Are there oil, coolant or fuel SENSORS
> that ground locally . . . in others words
> ground where they mount and then carry their
> data off on a single wire?
>
>
> Bob . . .
>
>
Message 11
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| Subject: | Re: Battery capacity tester-was flyback diode, |
now clock source
At 01:59 PM 7/20/2013, you wrote:
>That was my question John!=C2
>
>I found this:
><http://en.wikipedia.org/wiki/Flyback_diode>http://en.wikipedia.org/wiki/Fl
yback_diode
This is a good description. See also this
series of articles on 'spike suppression'
on our website.
http://tinyurl.com/mkcshhs
Bob . . .
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