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Post by Adam D. on Oct 8, 2013 1:33:32 GMT -5
The Casablanca Zephyr is working fine now, it's been running for over 6 hours now, and still.. I took the transistor over to my TV guy which has a transistor tester and the Transistor tests fine.. He mentioned about the wire clips that connect each wire to the connectors, that those can be a problem, he said something about old dictator machines used those same connectors, and he would have to come in and strip the wires and solder them in when one started to malfunction. They are little sharp metal clips that dig into the rubber of the wire to make contact.. I'm assuming the transistor connections were shorting out causing the original pot switch to burn out.. The 5 watt pots I ordered im pretty sure they are .5watt and are mislabeled.. They got hot as hot as the .5watt ones I used to test, while the 2watt one only gets mildly warm.. I called up digikey and told them about that. Even though the pot I currently have is working really good, it stalls the fan turned all the way down. So I gotta find a 10k at around 5watts.. so far I found this www.digikey.com/product-detail/en/RA30NASD103A/RA30NASD103A-ND/1956269Here is the demo video: Next I'm going to look into the Victorian I have that doesn't slow down..
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Post by Adam D. on Oct 10, 2013 14:54:08 GMT -5
The 2 watt potentiometer finally burnt out after running the fan non stop for a few days.. I suspected that this would happen.. I'm having a hell of a time looking for a 5watt 5k on the internet.. I'm starting to look into Rheostats, which the lowest watt rating on rheostats I found so far are 12.5 watts.. Most Pots are rated at 4watts and under, and most being between .5watt - 2watts Rheostats controls I've seen so far are rated between 12.5 - 150watts Sorta like nothing in between.. So far I only found this site which is in Canada that has 5watt pots.. I don't know If I trust that they really are.. www.mainelectronics.com/potentiometers.htmAny thoughts?
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Post by Deleted on Oct 10, 2013 22:25:40 GMT -5
Why not try 4 watts?
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Post by Adam D. on Oct 11, 2013 0:52:52 GMT -5
I was thinking that, I just don't want to spend $80+ on a control that could possibly fail at some point.. It's got a 10% tolerance, so it may be fine..
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Post by Deleted on Oct 11, 2013 1:15:28 GMT -5
I personally have tried a 5 watt pot . . . it failed eventually.
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Post by Adam D. on Oct 11, 2013 1:56:24 GMT -5
Do you remember where you got your 5watt pot from? I know that alot of these pots are made for audio applications, I think even the pots rated at 5watts.. Digikey says those others are rated at 5watts, and the fan burns those up almost instantly, but that 2watt one lasted 3 days of nonstop use.. I'm still trying to figure that out.. I may go as far as trying something like this.. Rheostat made out of ceramic.. it being rated at 12.5 watts.. I wonder if that will have any effect on the performance of the control seeing how the power wattage will be over rated.. www.ebay.com/itm/RHEOSTAT-OHMITE-RES5K0-WIREWOUND-5KOHM-12-5W-/181072511070?pt=LH_DefaultDomain_0&hash=item2a28c3405e
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Post by Deleted on Oct 11, 2013 2:13:09 GMT -5
Theoretically it shouldnt make a difference.
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Post by Adam D. on Oct 11, 2013 2:26:53 GMT -5
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Post by Deleted on Oct 11, 2013 3:32:39 GMT -5
Had what custom made?
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Post by Adam D. on Oct 11, 2013 9:41:48 GMT -5
There potentiometers..
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Post by Deleted on Oct 11, 2013 10:16:15 GMT -5
The original Casa pot is a standard 5k, 1/2 watt, linear taper.
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Post by Adam D. on Oct 11, 2013 11:35:10 GMT -5
I doubt the original standard was .5watt. There would be no way for it to dissipate the heat and would go up in smoke almost instantly.. The original control just has numbers and doesn't even say anything about ohms and wattage, unless someone has come across a schematic, no one really knows the wattage.. Someone on here has already mentioned that the Mallory replacement is a 5 watt control. any pot rated at .5watt is basically used in audio applications to only regulate signal.. Not voltage or wattage..
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Post by Deleted on Oct 11, 2013 18:32:24 GMT -5
You can say whatever you like. I know for a fact the original is 1/2 watt. The reason it has to dissipate more heat now is because something else in the circuit has failed.
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Post by Adam D. on Oct 11, 2013 20:02:23 GMT -5
This is coming from someone who has looked at this circuit that's had 40+ years of experience with circuitry.. He quoted "There is no way that a .5watt Potentiometer could handle this circuit".. Where are you getting this from? If you have a source, I would like to know.. I've tested all three resistors and had the transistor tested, and all test fine and/or within range.. There's really nothing much more to the circuit other than 4 rectifiers, an ac/dc converter chip and Capacitor.. I've got the original pot control right here, and there are no indications that show watts or ohms.. Nor is there any kind of schematic online that I could find...
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Post by Deleted on Oct 11, 2013 20:21:09 GMT -5
I'm getting this from, I've seen the original pot in dozens of fans.
Your electronics guy should be able to tell the wattage of the original pot . . . anything larger than 1 watt would be SIGNIFICANTlY larger. Even 1 watt would be larger than the original.
The four diodes convert AC to DC. The "converter chip" you reference is actually an MOV.
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