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02-24-2011, 08:43 AM
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#1
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Rivet Master
1967 24' Tradewind
Greenville
, South Carolina
Join Date: Jan 2009
Posts: 1,107
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Uses for Univolt?
Besides a boat anchor. I've purchased a new power converter and was wondering if there are any ideas for the use of the old in working condition Univolt? Does a battery need to be hooked up to it for it to work? Could it be employed for bench testing 12-volt items?
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02-24-2011, 09:07 AM
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#2
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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No, a battery does not have to be hooked up to it, and yes it would make a good bench power supply. If it were me, I'd replace the filter capacitors (electrolitics) because if it is over 10 years old, they go bad and the ripple voltage will be high.
__________________
Regards,
Steve
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02-24-2011, 09:08 AM
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#3
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Rivet Master
1969 31' Sovereign
Broken Arrow
, Oklahoma
Join Date: Jan 2003
Posts: 1,455
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Univolt is one of the converters that needs a battery to work properly.
Battery acts as a filter to the DC.
Having said that there are items that could be powered by the Univolt without a battery but you need to be careful as they are not the best regulated supply.
__________________
Garry
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02-24-2011, 09:12 AM
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#4
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INSANITY CENTRAL
1986 32' Excella
Airstream Funeral Coach
Citrus Heights
, California
Join Date: Aug 2006
Posts: 2,108
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those of us that fly r/c stuff usually have a 12 V. power supply for bench testing items. Also it's nice to have a bench setup to test items from your trailer, like when you remove a heater to rebuild it, test a fridge prior to installation, you pickin up what I;m puttin down?
you gonna stop by Casini this spring? sorry I missed you last time. out on the river.
__________________
www.popasmoke.com
Proud Appellation American
Vine View Heights is now closed.
YETI ( 65 Quart )
IGLOO (Ice Cube, 50 Quart )
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02-24-2011, 09:30 AM
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#5
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Rivet Master
1967 24' Tradewind
Greenville
, South Carolina
Join Date: Jan 2009
Posts: 1,107
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So we have a 'no it doesn't need a battery' and a 'it needs a battery to work properly'
Doorgunner,
Sounds like your drift is that it would be useful to keep for bench testing. Now I just need to find out of it does or does not need a battery to work properly.
I would like to go to Casini again and would love to bring my project if I can get it to that point by then. The insulation is taking me about 10x as long as I thought.
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02-24-2011, 09:38 AM
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#6
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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Quote:
Originally Posted by SilverHoot
Now I just need to find out of it does or does not need a battery to work properly.
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Plug it in and test the output. If you have voltage, you don't need a battery.
The lower voltage others have stated without a battery is because of the filter problem I stated above.
__________________
Regards,
Steve
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02-24-2011, 09:46 AM
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#7
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Rivet Master
1967 24' Tradewind
Greenville
, South Carolina
Join Date: Jan 2009
Posts: 1,107
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Thanks Steve. IF I can find and identify these capacitors, where might I obtain new ones?
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02-24-2011, 09:56 AM
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#8
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Rivet Master
1977 27' Overlander
Trotwood
, Ohio
Join Date: Jul 2007
Posts: 2,153
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I would just love to find a schematic of the UNIVOLT. I would like to replace the caps also. I want to parts in hand before I tear it down. Im getting noise in my radio. I know those filter caps are bad. ANY ONE HAVE A SCHEMATIC.??? HOOT I think any electronics supply house should have the caps. I have several here locally.
__________________
Roger & MaryLou
___________________
F350 CREWCAB SW LONG BED
7.3 liter Power Stroke Diesel
1977 27ft OVERLANDER
KA8LMQ
AIR # 22336 TAC- OH-7
May your roads be straight and smooth and may you always have a tailwind!
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02-24-2011, 11:04 AM
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#9
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Rivet Master
2005 39' Land Yacht 390 XL 396
Common Sense
, Texas
Join Date: Sep 2007
Posts: 5,319
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Quote:
Originally Posted by SilverHoot
Thanks Steve. IF I can find and identify these capacitors, where might I obtain new ones?
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As I remember, they will be the big round ones, I think they are black, and they are mounted on the chasis sticking out the top. You should be able to get replacement at any old-timey electronics parts house. If you can find bigger ones, (in MFD=microfarad) all the better. They will be marked something like 10,000 microfarad at 25 volts DC.
__________________
Regards,
Steve
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02-24-2011, 11:24 AM
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#10
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4 Rivet Member
1969 25' Tradewind
1971 18' Caravel
Berkeley Springs
, West Virginia
Join Date: Jan 2005
Posts: 423
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The original Univolt I have from my 69 Tradewind was strictly a Circuit Breaker, Transformer, Full-Wave Rectifier, Charging/Sensing Control Printed Circuit Board. and an SCR. The SCR was the charging current control device for the battery. There were no filter capacitors on this model. Maybe later models included filter capacitors but, to serve as a charger those would have had to have been larger (over 10,000 micro-Farad) capacitors.
I replaced my Univolt with a Intellipower.
I kept the old one as a spare battery charger and I use it in my electrical training classes as an unfiltered DC voltage source. It works great for demonstrating dc motors and to compare running lighting on dc or ac sources. Remember in older Airstreams they only served to run lighting, charge the battery and provide power to one or two dc outlets. It didn't need to be smooth filtered dc for electronic devices.
__________________
Tom
Res nolunt diu male administrari.
WDCU Unit #170
Air #7085
TAC VA-4
WBCCI #2641
VAC
71 Caravel
69 Tradewind
My YouTube Channel
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02-24-2011, 11:33 AM
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#11
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Rivet Master
1977 Argosy Minuet 6.0 Metre
Colorado Springs
, Colorado
Join Date: Dec 2003
Posts: 739
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I gave the old Univolt out of the Minuet to a fellow Ham operator. He rebuilt it for a bench supply.
__________________
Royce (K0RKK) 146.460 simplex
Web page https://spearfishcreek.net/
AIR# 3913
'77' Minuet 6 Metre, behind a 2005 stock Jeep Rubicon with Equa-L-Zer hitch.
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02-24-2011, 11:37 AM
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#12
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Rivet Master
Port Orchard
, Washington
Join Date: May 2009
Posts: 4,463
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Quote:
Originally Posted by SilverHoot
Besides a boat anchor. I've purchased a new power converter and was wondering if there are any ideas for the use of the old in working condition Univolt? Does a battery need to be hooked up to it for it to work? Could it be employed for bench testing 12-volt items?
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In my opinion, this is something that should be either sold or given to someone who wants to maintain the originality of an old Airstream. It could be refurbished.
Otherwise recycle it. The technology, design and age of components are old enough to be of little use in a modern environment.
If you want a bench supply you can get a good modern regulated one for very little investment.
Ken
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02-24-2011, 01:51 PM
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#13
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Rivet Master
1967 24' Tradewind
Greenville
, South Carolina
Join Date: Jan 2009
Posts: 1,107
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Be happy to give it away. Never known anybody to want one.
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02-24-2011, 02:24 PM
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#14
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Rivet Master
1958 26' Overlander
Mesa
, Arizona
Join Date: Jul 2004
Posts: 1,742
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Boat anchor or paper weight. Either one is an excellent use for an old Univolt.
__________________
1958 Overlander
2011 Wolf Creek 850N TC
2011 Ford F-250 Crewcab (6.2L), 3.73RE
WBCCI #5661/AIR #5661/TAC # AZ-6
4CU 1st VP
My '58 Overlander Restoration and Travel Blog:
https://mellomikesairstreams.blogspot.com/
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