AeroElectric-List Digest Archive

Mon 08/16/10


Total Messages Posted: 15



Today's Message Index:
----------------------
 
     1. 07:10 AM - Aeroflash power supply (Ken)
     2. 07:47 AM - Re: headset cushions (Speedy11@aol.com)
     3. 07:56 AM - Re: Aeroflash power supply (Robert L. Nuckolls, III)
     4. 08:06 AM - Re: Re: headset cushions (Robert L. Nuckolls, III)
     5. 08:09 AM - Re: Re: headset cushions (DeWitt (Dee) Whittington)
     6. 08:34 AM - Re: Aeroflash power supply (Carlos Trigo)
     7. 09:23 AM - Re: Aeroflash power supply (F. Tim Yoder)
     8. 09:25 AM - Re: Re: headset cushions (Jim Mcculley)
     9. 09:40 AM - Re: Aeroflash power supply (Jim Mcculley)
    10. 03:14 PM - There must be a better way to fix a Garmin GPSMap196 (Sam Hoskins)
    11. 05:26 PM - Re: There must be a better way to fix a Garmin GPSMap196 (Charlie England)
    12. 06:09 PM - Re: Aeroflash power supply (Charlie England)
    13. 06:34 PM - 9024 module lights, labeling (jonlaury)
    14. 10:18 PM - Tempermental KT-76A (Gregory Clawson)
    15. 10:18 PM - Re: Aeroflash power supply (Ken)
 
 
 


Message 1


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    Time: 07:10:28 AM PST US
    From: Ken <klehman@albedo.net>
    Subject: Aeroflash power supply
    I have a failed Aeroflash 152-0011 double flash strobe power supply. Aeroflash tells me they will not overhaul it as it is older than 5 years. It charges the 50uf 450 volt capacitor. I can hear the trigger fire at about 450 volts, the voltage keeps building and after about 3 audible triggers it shuts down, likely due to overvoltage at about 500 volts. After several seconds the voltage decays and this repeats. There are no trigger pulses to the flash tube at any time. Even with this description, the Aeroflash support tech thinks it is the proprietary photoflash capacitor but I thought I'd ask the list for any thoughts. It seems that the cap charges OK so I was surprised that the technician still thinks it is the capacitor. It seems they have very few failures of any other components. I have not found a circuit diagram and the semiconductors are not marked. thanks Ken


    Message 2


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    Time: 07:47:36 AM PST US
    From: Speedy11@aol.com
    Subject: Re: headset cushions
    Hmmm ... are lots of people having trouble with Lightspeed headsets? Cushions coming off? Exposed wires? Multiple trips to the factory for refurbishment? They may be great folks to deal with, but is the original product weak is certain areas? I haven't owned a Lightspeed - just curious. Stan Sutterfield I've twice sent my old Lightspeeds back to the company and twice I got refurbished, new looking headsets back...free. Great folks


    Message 3


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    Time: 07:56:38 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: Aeroflash power supply
    At 08:35 AM 8/16/2010, you wrote: > >I have a failed Aeroflash 152-0011 double flash strobe power supply. >Aeroflash tells me they will not overhaul it as it is older than 5 years. > >It charges the 50uf 450 volt capacitor. I can hear the trigger fire >at about 450 volts, the voltage keeps building and after about 3 >audible triggers it shuts down, likely due to overvoltage at about >500 volts. After several seconds the voltage decays and this >repeats. There are no trigger pulses to the flash tube at any time. >Even with this description, the Aeroflash support tech thinks it is >the proprietary photoflash capacitor but I thought I'd ask the list >for any thoughts. It seems that the cap charges OK so I was >surprised that the technician still thinks it is the capacitor. It >seems they have very few failures of any other components. I have >not found a circuit diagram and the semiconductors are not marked. Here's an exemplar flash tube schematic: Emacs! There are two capacitors involved with getting a strobe to flash. One is the fat energy storage capacitor . . . the one that gets charged to 400+ volts. (C3 in the schematic) There's another small capacitor (C6 in this schematic) that also charges to 440+ volts. This is the trigger generator that gets discharged into the secondary of a trigger transformer with about a 1:30 step-up ratio. The resulting 10,000+ volt pulse is simply applied to a wire that wraps around the glass envelope of the flash-tube. ELECTROSTATIC coupling of the trigger pulse through the glass excites the xenon gas into conduction whereby and energy from the fat capacitor is discharged through the gas. See: http://www.repairfaq.org/REPAIR/F_strbfaq.html What you're describing suggests that the power supply is working and the energy storage capacitor is charging. What you're probably missing is the trigger stimulus. Bob . . .


    Message 4


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    Time: 08:06:55 AM PST US
    From: "Robert L. Nuckolls, III" <nuckolls.bob@aeroelectric.com>
    Subject: Re: headset cushions
    At 09:45 AM 8/16/2010, you wrote: > >Hmmm ... are lots of people having trouble with Lightspeed >headsets? Cushions coming off? Exposed wires? Multiple trips to >the factory for refurbishment? >They may be great folks to deal with, but is the original product >weak is certain areas? >I haven't owned a Lightspeed - just curious. I used to rent airplanes . . . and headsets if the pilots didn't have their own and wanted to use ours. Some brands of headsets were more robust than others . . . like David Clarks . . . but everyone's headsets required some degree of upkeep. The cockpit of an airplane is a terrible place to store anything rubber/plastic. My personal headsets are kept in a special headset bag that goes along with my documents flight bag and they're never stored in the airplane. They were really inexpensive headsets but are still in excellent shape after 500 hours/ 15+ years. A little Armor All treatment of plastic muffs seems to help with replacement of the plasticizers that keeps them flexible and crack free. I would be cautious about throwing mud at any particular brand without having side-by-side comparisons of headsets subjected to exactly the same service stresses. The most interesting feature folks have cited about Lightspeed is their willingness to provide good customer support and attractive prices. A less robust headset with good field support can have a much lower cost of ownership than a premium headset with poor support. Bob . . .


    Message 5


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    Time: 08:09:15 AM PST US
    Subject: Re: headset cushions
    From: "DeWitt (Dee) Whittington" <dee.whittington@gmail.com>
    In my case, my Lightspeed was one of the first models the made and I used it a lot as a CFII for a 60-member flying club. I'd have no problem buying another Lightspeed except right now I'm still building the Sportsman and am not flying much. Also, I have ears that stick out like Alfred E Neuman (remember, Mr. "What me worry?" from Mad Magazine), and the Lightspeed was the very most comfortable headset I could find which I could wear over an hour at a time. Dee On Mon, Aug 16, 2010 at 10:45 AM, <Speedy11@aol.com> wrote: > > Hmmm ... are lots of people having trouble with Lightspeed headsets? > Cushions coming off? Exposed wires? Multiple trips to the factory for > refurbishment? > They may be great folks to deal with, but is the original product weak is > certain areas? > I haven't owned a Lightspeed - just curious. > Stan Sutterfield > > I've twice sent my old Lightspeeds back to the company > and twice I got refurbished, new looking headsets back...free. Great > folks > > * > > * > > -- DeWitt (Dee) Whittington www.VirginiaFlyIn.org Building Glasair Sportsman with partners


    Message 6


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    Time: 08:34:19 AM PST US
    From: "Carlos Trigo" <trigo@mail.telepac.pt>
    Subject: Aeroflash power supply
    Bob I cannot find any C6 in the schematic. Is it that small? Carlos _____ From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: segunda-feira, 16 de Agosto de 2010 15:56 Subject: Re: AeroElectric-List: Aeroflash power supply At 08:35 AM 8/16/2010, you wrote: I have a failed Aeroflash 152-0011 double flash strobe power supply. Aeroflash tells me they will not overhaul it as it is older than 5 years. It charges the 50uf 450 volt capacitor. I can hear the trigger fire at about 450 volts, the voltage keeps building and after about 3 audible triggers it shuts down, likely due to overvoltage at about 500 volts. After several seconds the voltage decays and this repeats. There are no trigger pulses to the flash tube at any time. Even with this description, the Aeroflash support tech thinks it is the proprietary photoflash capacitor but I thought I'd ask the list for any thoughts. It seems that the cap charges OK so I was surprised that the technician still thinks it is the capacitor. It seems they have very few failures of any other components. I have not found a circuit diagram and the semiconductors are not marked. Here's an exemplar flash tube schematic: Emacs! There are two capacitors involved with getting a strobe to flash. One is the fat energy storage capacitor . . . the one that gets charged to 400+ volts. (C3 in the schematic) There's another small capacitor (C6 in this schematic) that also charges to 440+ volts. This is the trigger generator that gets discharged into the secondary of a trigger transformer with about a 1:30 step-up ratio. The resulting 10,000+ volt pulse is simply applied to a wire that wraps around the glass envelope of the flash-tube. ELECTROSTATIC coupling of the trigger pulse through the glass excites the xenon gas into conduction whereby and energy from the fat capacitor is discharged through the gas. See: http://www.repairfaq.org/REPAIR/F_strbfaq.html What you're describing suggests that the power supply is working and the energy storage capacitor is charging. What you're probably missing is the trigger stimulus. Bob . . .


    Message 7


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    Time: 09:23:33 AM PST US
    From: "F. Tim Yoder" <ftyoder@yoderbuilt.com>
    Subject: Re: Aeroflash power supply
    C5 I think. ----- Original Message ----- From: Carlos Trigo To: aeroelectric-list@matronics.com Sent: Monday, August 16, 2010 8:32 AM Subject: RE: AeroElectric-List: Aeroflash power supply Bob I cannot find any C6 in the schematic. Is it that small? Carlos ------------------------------------------------------------------------- ----- From: owner-aeroelectric-list-server@matronics.com [mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L. Nuckolls, III Sent: segunda-feira, 16 de Agosto de 2010 15:56 To: aeroelectric-list@matronics.com Subject: Re: AeroElectric-List: Aeroflash power supply At 08:35 AM 8/16/2010, you wrote: I have a failed Aeroflash 152-0011 double flash strobe power supply. Aeroflash tells me they will not overhaul it as it is older than 5 years. It charges the 50uf 450 volt capacitor. I can hear the trigger fire at about 450 volts, the voltage keeps building and after about 3 audible triggers it shuts down, likely due to overvoltage at about 500 volts. After several seconds the voltage decays and this repeats. There are no trigger pulses to the flash tube at any time. Even with this description, the Aeroflash support tech thinks it is the proprietary photoflash capacitor but I thought I'd ask the list for any thoughts. It seems that the cap charges OK so I was surprised that the technician still thinks it is the capacitor. It seems they have very few failures of any other components. I have not found a circuit diagram and the semiconductors are not marked. Here's an exemplar flash tube schematic: There are two capacitors involved with getting a strobe to flash. One is the fat energy storage capacitor . . . the one that gets charged to 400+ volts. (C3 in the schematic) There's another small capacitor (C6 in this schematic) that also charges to 440+ volts. This is the trigger generator that gets discharged into the secondary of a trigger transformer with about a 1:30 step-up ratio. The resulting 10,000+ volt pulse is simply applied to a wire that wraps around the glass envelope of the flash-tube. ELECTROSTATIC coupling of the trigger pulse through the glass excites the xenon gas into conduction whereby and energy from the fat capacitor is discharged through the gas. See: http://www.repairfaq.org/REPAIR/F_strbfaq.html What you're describing suggests that the power supply is working and the energy storage capacitor is charging. What you're probably missing is the trigger stimulus. Bob . . . ------------------------------------------------------------------------- ----- Checked by AVG - www.avg.com 08/15/10 23:35:00


    Message 8


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    Time: 09:25:05 AM PST US
    From: Jim Mcculley <mcculleyja@verizon.net>
    Subject: Re: headset cushions
    Stan, I can't say enough good things about Lightspeed products and/or their customer support! I've been operating with their headsets since the late 1990's and have had only a couple of instances with the early headband and ear cushion material. I've never been asked to pay for anything, as they always replaced components with the most recently up-graded items and also usually updated other components beyond what I asked for. I also fly a club aircraft that is fitted with Bose. The differences are such as to cause me to take my personal Lightspeeds, due to both head comfort and sound clarity. Price doesn't always indicate superiority!!! Jim ==================================================================================== Speedy11@aol.com wrote: > > Hmmm ... are lots of people having trouble with Lightspeed headsets? > Cushions coming off? Exposed wires? Multiple trips to the factory > for refurbishment? > They may be great folks to deal with, but is the original product weak > is certain areas? > I haven't owned a Lightspeed - just curious. > Stan Sutterfield > > I've twice sent my old Lightspeeds back to the company > and twice I got refurbished, new looking headsets back...free. Great > folks > =======================================================================================* *


    Message 9


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    Time: 09:40:07 AM PST US
    From: Jim Mcculley <mcculleyja@verizon.net>
    Subject: Re: Aeroflash power supply
    Did you mean C5 rather than C6? Jim ==================================================================================== Robert L. Nuckolls, III wrote: > At 08:35 AM 8/16/2010, you wrote: >> >> I have a failed Aeroflash 152-0011 double flash strobe power supply. >> Aeroflash tells me they will not overhaul it as it is older than 5 years. >> >> It charges the 50uf 450 volt capacitor. I can hear the trigger fire >> at about 450 volts, the voltage keeps building and after about 3 >> audible triggers it shuts down, likely due to overvoltage at about >> 500 volts. After several seconds the voltage decays and this repeats. >> There are no trigger pulses to the flash tube at any time. Even with >> this description, the Aeroflash support tech thinks it is the >> proprietary photoflash capacitor but I thought I'd ask the list for >> any thoughts. It seems that the cap charges OK so I was surprised >> that the technician still thinks it is the capacitor. It seems they >> have very few failures of any other components. I have not found a >> circuit diagram and the semiconductors are not marked. > > Here's an exemplar flash tube schematic: > > > Emacs! > > There are two capacitors involved with getting > a strobe to flash. One is the fat energy storage > capacitor . . . the one that gets charged to > 400+ volts. (C3 in the schematic) > > There's another small capacitor (C6 in this schematic) > that also charges to 440+ volts. This is the > trigger generator that gets discharged into > the secondary of a trigger transformer with > about a 1:30 step-up ratio. The resulting > 10,000+ volt pulse is simply applied to a wire > that wraps around the glass envelope of the > flash-tube. ELECTROSTATIC coupling of the > trigger pulse through the glass excites the > xenon gas into conduction whereby and energy > from the fat capacitor is discharged through > the gas. > > See: > > http://www.repairfaq.org/REPAIR/F_strbfaq.html > > What you're describing suggests that the > power supply is working and the energy storage > capacitor is charging. What you're probably > missing is the trigger stimulus. > > Bob . . . ==================================================================================


    Message 10


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    Time: 03:14:30 PM PST US
    Subject: There must be a better way to fix a Garmin GPSMap196
    From: Sam Hoskins <sam.hoskins@gmail.com>
    I find I have a broken connector pin in my Garmin GPSMap196. This is for the cable that is the aircraft & computer interface. I took the thing apart and it could be easily replaced. I called Garmin no-support and they can't sell me a $0.50 part, but they do have a flat rate repair for just $200.00. Would anyone happen to know where I might get my hands on such a critter? Or anyone have one they dropped and wanted to get rid of the heap of parts? Maybe I could repair the connector by drilling out the bad pin they epoxy in a D-sub pin. Trying to attach a couple of blurry photos. Thanks. Sam


    Message 11


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    Time: 05:26:51 PM PST US
    From: Charlie England <ceengland@bellsouth.net>
    Subject: Re: There must be a better way to fix a Garmin GPSMap196
    On 8/16/2010 5:11 PM, Sam Hoskins wrote: > I find I have a broken connector pin in my Garmin GPSMap196. This is > for the cable that is the aircraft & computer interface. I took the > thing apart and it could be easily replaced. I called Garmin > no-support and they can't sell me a $0.50 part, but they do have a > flat rate repair for just $200.00. > > Would anyone happen to know where I might get my hands on such a > critter? Or anyone have one they dropped and wanted to get rid of the > heap of parts? > > Maybe I could repair the connector by drilling out the bad pin they > epoxy in a D-sub pin. > > Trying to attach a couple of blurry photos. > > Thanks. > > Sam > > Do a little research on which elcheapo Garmins use the same connector (it's really common), & bid on one on ebay. Or just hard-wire a USB pigtail into it, & put a mating connector on your cable in the plane. Charlie


    Message 12


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    Time: 06:09:07 PM PST US
    From: Charlie England <ceengland@bellsouth.net>
    Subject: Re: Aeroflash power supply
    On 8/16/2010 8:35 AM, Ken wrote: > > I have a failed Aeroflash 152-0011 double flash strobe power supply. > Aeroflash tells me they will not overhaul it as it is older than 5 years. > > It charges the 50uf 450 volt capacitor. I can hear the trigger fire at > about 450 volts, the voltage keeps building and after about 3 audible > triggers it shuts down, likely due to overvoltage at about 500 volts. > After several seconds the voltage decays and this repeats. There are > no trigger pulses to the flash tube at any time. Even with this > description, the Aeroflash support tech thinks it is the proprietary > photoflash capacitor but I thought I'd ask the list for any thoughts. > It seems that the cap charges OK so I was surprised that the > technician still thinks it is the capacitor. It seems they have very > few failures of any other components. I have not found a circuit > diagram and the semiconductors are not marked. > > thanks > Ken Note to self: Aeroflash does not adequately support their products. Avoid that brand. Not much help for you, but passing along that info could help a lot of other homebuilders. Thanks, Charlie


    Message 13


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    Time: 06:34:56 PM PST US
    Subject: 9024 module lights, labeling
    From: "jonlaury" <jonlaury@impulse.net>
    Group, I am labeling the panel that will contain the aux alternator switch and the aux alternator will most likely be controlled by a 9024. The 9024 low voltage function will power a flashing LED. As the 9024 latches open in an over voltage event (triggering the LV LED) and requires removal of power to reset, it seems that adequate notice of OV power interruption would be given by the flashing LV LED So is there any reason to have an OV test switch, or OV indicator light? Thanks, John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=309049#309049


    Message 14


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    Time: 10:18:10 PM PST US
    From: Gregory Clawson <aeroclaw@yahoo.com>
    Subject: Tempermental KT-76A
    I am hoping for some guidance regarding a capricious KT-76A transponder. It works normally for a while, and then the Mode C cuts out. I am using a Dynon D-100 for the altitude encoder, then Dynon's grey-code converter to send the signal to the transponder. All the physical connections are sound, and the Dynon components are pretty robust. Any suggestions on where I should start trouble-shooting before I call the avionics shop guys out to the plane? Thanks


    Message 15


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    Time: 10:18:21 PM PST US
    From: Ken <klehman@albedo.net>
    Subject: Re: Aeroflash power supply
    The strobe refresher and reference was appreciated. It seems that the trigger transformer is actually embedded in the molded silicone base of the 073-0270 flashtube. An old troubleshooting FAQ says that a voltmeter should measure 150 to 175 volts on the trigger line out of the power supply (scope still shows zero). The resistances that I measure on a new flashtube seem to confirm that the transformer is in the flashtube assembly. It looks like the triggering SCR in the power supply is a T106C1 rated at 300 volts. Now if I could just figure out why it has no voltage to switch... Ken Robert L. Nuckolls, III wrote: > At 08:35 AM 8/16/2010, you wrote: >> >> I have a failed Aeroflash 152-0011 double flash strobe power supply. >> Aeroflash tells me they will not overhaul it as it is older than 5 years. >> >> It charges the 50uf 450 volt capacitor. I can hear the trigger fire at >> about 450 volts, the voltage keeps building and after about 3 audible >> triggers it shuts down, likely due to overvoltage at about 500 volts. >> After several seconds the voltage decays and this repeats. There are >> no trigger pulses to the flash tube at any time. Even with this >> description, the Aeroflash support tech thinks it is the proprietary >> photoflash capacitor but I thought I'd ask the list for any thoughts. >> It seems that the cap charges OK so I was surprised that the >> technician still thinks it is the capacitor. It seems they have very >> few failures of any other components. I have not found a circuit >> diagram and the semiconductors are not marked. > > Here's an exemplar flash tube schematic: > > > Emacs! > > There are two capacitors involved with getting > a strobe to flash. One is the fat energy storage > capacitor . . . the one that gets charged to > 400+ volts. (C3 in the schematic) > > There's another small capacitor (C6 in this schematic) > that also charges to 440+ volts. This is the > trigger generator that gets discharged into > the secondary of a trigger transformer with > about a 1:30 step-up ratio. The resulting > 10,000+ volt pulse is simply applied to a wire > that wraps around the glass envelope of the > flash-tube. ELECTROSTATIC coupling of the > trigger pulse through the glass excites the > xenon gas into conduction whereby and energy > from the fat capacitor is discharged through > the gas. > > See: > > http://www.repairfaq.org/REPAIR/F_strbfaq.html > > What you're describing suggests that the > power supply is working and the energy storage > capacitor is charging. What you're probably > missing is the trigger stimulus. > > Bob . . .




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