Today's Message Index:
----------------------
1. 12:30 PM - strobe capacitors (Sheldon Olesen)
2. 12:51 PM - Re: strobe capacitors (Jeff Luckey)
3. 01:17 PM - Re: strobe capacitors (Sheldon Olesen)
4. 01:49 PM - Re: strobe capacitors (Charles Kuss)
5. 03:23 PM - Re: strobe capacitors (Charlie England)
6. 05:29 PM - Re: NanoCAD SoftwaRe: resurrecting an old thread (Charlie England)
7. 09:32 PM - Re: strobe capacitors (user9253)
Message 1
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| Subject: | strobe capacitors |
My strobes aren't working and I am assuming that the power pack is bad. The fuses
aren't blown and I have checked that there is voltage to the unit. I think
the capacitors are to blame. Creativair, the company I bought the Avi-Pak
strobe unit from, appears to be out of business.
The capacitors are 400uf and 360vdc. I checked on Mouser and Digikey for equivalents
but there none that match the specs, are in stocked in <12 weeks, or don't
require the purchase of >30 units. Digikey showed nothing.
The actual part reads: Nova-Cap-12 400uf 360vdc 658-0793-049
Does anyone know where to source these parts quickly or of an equivalent part that
would work? Am I correct in thinking the capacitors are the problem?
Sheldon Olesen
Sent from my iPad
Message 2
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| Subject: | Re: strobe capacitors |
Sheldon,
It would be good to confirm that the caps are the problem before you start
swapping parts.
Sometimes, as caps age, they swell or leak.=C2- Do yours exhibit those sy
mptoms? Can you get one out of the circuit & test it?
-Jeff
On Friday, December 4, 2015 12:41 PM, Sheldon Olesen <saolesen@sirentel
.net> wrote:
.net>
My strobes aren't working and I am assuming that the power pack is bad.=C2
- The fuses aren't blown and I have checked that there is voltage to the
unit.=C2- I think the capacitors are to blame.=C2- Creativair, the comp
any I bought the Avi-Pak strobe unit from, appears to be out of business.
=C2-
The capacitors=C2- are 400uf and 360vdc.=C2- I checked on Mouser and Di
gikey for equivalents but there none that match the specs, are in stocked i
n <12 weeks, or don't require the purchase of >30 units.=C2- Digikey show
ed nothing.
The actual part reads: Nova-Cap-12=C2- 400uf=C2- 360vdc=C2- 658-0793-
049
Does anyone know where to source these parts quickly or of an equivalent pa
rt that would work?=C2- Am I correct in thinking the capacitors are the p
roblem?
Sheldon Olesen
Sent from my iPad
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
-
S -
-
=C2- =C2- =C2- =C2- =C2- -Matt Dralle, List Admin.
Message 3
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| Subject: | Re: strobe capacitors |
Jeff,
There is no swelling or leakage.
With my multimeter set CAP, one reads .051nf and the other .083nf. My ca
pacitor testing knowledge is meager.
Sheldon
Sent from my iPad
> On Dec 4, 2015, at 3:49 PM, Jeff Luckey <jluckey@pacbell.net> wrote:
>
> Sheldon,
>
> It would be good to confirm that the caps are the problem before you start
swapping parts.
>
> Sometimes, as caps age, they swell or leak. Do yours exhibit those sympto
ms? Can you get one out of the circuit & test it?
>
> -Jeff
>
>
>
> On Friday, December 4, 2015 12:41 PM, Sheldon Olesen <saolesen@sirentel.ne
t> wrote:
>
>
.net>
>
> My strobes aren't working and I am assuming that the power pack is bad. T
he fuses aren't blown and I have checked that there is voltage to the unit.
I think the capacitors are to blame. Creativair, the company I bought the A
vi-Pak strobe unit from, appears to be out of business.
>
> The capacitors are 400uf and 360vdc. I checked on Mouser and Digikey for
equivalents but there none that match the specs, are in stocked in <12 week
s, or don't require the purchase of >30 units. Digikey showed nothing.
>
> The actual part reads: Nova-Cap-12 400uf 360vdc 658-0793-049
>
> Does anyone know where to source these parts quickly or of an equivalent p
art that would work? Am I correct in thinking the capacitors are the proble
m?
>
> Sheldon Olesen
>
> Sent from my iPad
>
>
> > htsp; -= - The AeroElectric-List Email Fo
rum -avigator?AeroElectric-List" target="_blank">http://www.matronics.com/
Navi========================
Message 4
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| Subject: | Re: strobe capacitors |
Sheldon,
Before you start replacing parts, a question. Has the power pack sat unused for
an extended period of time? [more than 1 year] If so, you can probably bring
those capacitors back to life. You just need to reform them, by applying reduced
voltages to the unit, in stages. See
http://www.robotroom.com/Capacitor-Self-Discharge-3.html
http://www.vcomp.co.uk/tech_tips/reform_caps.htm
If you do need to replace them, read this first.
http://www.robotroom.com/Capacitor-Self-Discharge-3.html
I seem to remember that Bob Nuckolls listed a method to resurrect a dead strobe
power supply. I believe I have that info stashed on my home computer. I'll look
when I get home.
Charlie
--------------------------------------------
On Fri, 12/4/15, Sheldon Olesen <saolesen@sirentel.net> wrote:
Subject: AeroElectric-List: strobe capacitors
To: aeroelectric-list@matronics.com
Date: Friday, December 4, 2015, 3:27 PM
--> AeroElectric-List message
posted by: Sheldon Olesen <saolesen@sirentel.net>
My strobes aren't working and I am assuming that the power
pack is bad.The fuses aren't blown and I
have checked that there is voltage to the unit. I
think the capacitors are to blame. Creativair, the
company I bought the Avi-Pak strobe unit from, appears to be
out of business.
The capacitors are 400uf and 360vdc. I checked
on Mouser and Digikey for equivalents but there none that
match the specs, are in stocked in <12 weeks, or don't
require the purchase of >30 units. Digikey showed
nothing.
The actual part reads: Nova-Cap-12
400uf360vdc 658-0793-049
Does anyone know where to source these parts quickly or of
an equivalent part that would work? Am I correct in
thinking the capacitors are the problem?
Sheldon Olesen
-Matt
Dralle, List Admin.
Message 5
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| Subject: | Re: strobe capacitors |
That certainly *looks* bad. Find another random value known-good
capacitor you can use to verify your capacitance tester. (Electrolytic
caps may measure as much as 80% higher than their rated capacitance.)
The old school method of testing for bad vs 'maybe good' was to first,
be sure it's discharged. (A 300V pop can be painful, and would destroy
an analog ohm meter.) An old analog ohm meter was connected across the
cap's leads, first in one direction, then the other. Idea is that if
it's a good cap, it will accept a slight charge from the ohm meter's
test voltage (even with reversed leads). When the leads are swapped, the
meter will momentarily move toward low resistance, then rebound to show
open circuit as the cap charges the other way.
This does *not* prove the cap is good, but if you don't get meter
movement, it will prove it's bad.
For a replacement, you want the capacitance to be close to original
(check the tolerance on the label, if possible), but voltage can be
anything higher than the original rating. Here's an Allied search,
showing one that should work (for a seemingly painful price; I remember
paying <$10, but that was over 30 years ago...).
http://www.alliedelec.com/passive-components/capacitors/?navigation=4294921432
Charlie
On 12/4/2015 3:16 PM, Sheldon Olesen wrote:
> Jeff,
>
> There is no swelling or leakage.
>
> With my multimeter set CAP, one reads .051nf and the other .083nf.
> My capacitor testing knowledge is meager.
>
> Sheldon
>
>
> Sent from my iPad
>
> On Dec 4, 2015, at 3:49 PM, Jeff Luckey <jluckey@pacbell.net
> <mailto:jluckey@pacbell.net>> wrote:
>
>> Sheldon,
>>
>> It would be good to confirm that the caps are the problem before you
>> start swapping parts.
>>
>> Sometimes, as caps age, they swell or leak. Do yours exhibit those
>> symptoms? Can you get one out of the circuit & test it?
>>
>> -Jeff
>>
>>
>>
>> On Friday, December 4, 2015 12:41 PM, Sheldon Olesen
>> <saolesen@sirentel.net <mailto:saolesen@sirentel.net>> wrote:
>>
>>
>> <saolesen@sirentel.net <mailto:saolesen@sirentel.net>>
>>
>> My strobes aren't working and I am assuming that the power pack is
>> bad. The fuses aren't blown and I have checked that there is voltage
>> to the unit. I think the capacitors are to blame. Creativair, the
>> company I bought the Avi-Pak strobe unit from, appears to be out of
>> business.
>>
>> The capacitors are 400uf and 360vdc. I checked on Mouser and
>> Digikey for equivalents but there none that match the specs, are in
>> stocked in <12 weeks, or don't require the purchase of >30 units.
>> Digikey showed nothing.
>>
>> The actual part reads: Nova-Cap-12 400uf 360vdc 658-0793-049
>>
>> Does anyone know where to source these parts quickly or of an
>> equivalent part that would work? Am I correct in thinking the
>> capacitors are the problem?
>>
>> Sheldon Olesen
>>
>> Sent from my iPad
>>
>>
>> > htsp; -= - The AeroElectric-List Email
>> Forum -avigator?AeroElectric-List"
>> target="_blank">http://www.matronics.com/Navi========================
>> <http://www.matronics.com/contribution>
Message 6
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| Subject: | Re: NanoCAD Software: resurrecting an old thread |
*snipped**
*
> But, it does seem perfect for panel layouts and electrical plans.
>
> * Agreed
> *
> * There's another free program called NanoCAD
>
> *
> *http://tinyurl.com/pqw35rw
>
> <http://tinyurl.com/pqw35rw> *
> * Very powerful clone of AutoCAD. If you're already *
> * familiar with driving autocad, the transition into *
> * nanocad is smooth and painless.
>
> *
>
> Bob . . .
>
I installed NanoCAD many months ago, registered it then promptly forgot
about it. Now, when I open it, it tells me my registration is expired, &
when I try to re-register, as instructed, I get an email telling
me....my registration is expired. Anyone else having these issues?
Charlie
Message 7
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| Subject: | Re: strobe capacitors |
You could charge the capacitor using 120 VAC rectified with a bridge rectifier,
and maybe a series resistor to limit inrush current. Observe capacitor polarity
so that the capacitor does not explode like a firecracker. Then unplug the
AC and measure the voltage across the capacitor. It should hold the charge
for at least a few minutes. Some people check large value capacitors by charging
them up, then shorting the capacitor leads together. If it sparks, it is
assumed the capacitor is good.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=450752#450752
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