7808
New Member
Posts: 13
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Post by 7808 on Jun 9, 2009 0:20:30 GMT -5
what do these clip on heatsinks for soldering look like and where do you get them? is there any way to use somthing someone might already have around to devert solder gun heat away from the diodes of the rectifiers?
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Post by pamcopete on Jun 9, 2009 5:31:31 GMT -5
7808
The clip type heatsinks look like tweezers that are arranged so they are always closed instead of open. You can use a small pair of needle nose pliers and a rubber band to hold the jaws closed.
You can also just use crimp style connectors as long as you solder the wire in the connector. This is necessary because the rectifier gets hot and that can lead to accelerated corrosion of the wire in the crimp.
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Post by ZouLou on Jun 16, 2009 0:28:09 GMT -5
Anyone know where I could pick up a finned heat sink plate similar to rudy's a few pages back? Any help is greatly appreciated.
-Kyle
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Post by xsleo on Jun 16, 2009 2:16:42 GMT -5
You might find a heat sink at someplace that fixes old computers and other electronic equipment. If it came from a junk piece of equipment it should be cheap. Drive around on trash pick up day and see if anyone has thrown an old computer or tv away, might have what you need for free.
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Post by ShakerNorm on Jul 30, 2009 20:38:29 GMT -5
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Post by ShakerNorm on Jul 31, 2009 21:41:54 GMT -5
Well - got the new rectifiers built up and hooked up and they work like a dream! Rode the bike around for an hour with no problems at all - and when I got home, the rectifiers were barely warm! ;D I'm still having flasher problems, but hopefully the new flasher I have coming will solve that. It seems that my lights stayed brighter, particularly at idle, but I can't verify any change in voltage until I pick up my Multimeter from work (Dummy forgot to bring it home today...  ) I still have to rip it all out, goop it up with heat sink compound between the rectifiers and the .160" loomynum that I used for a heat sink, then paint it all black to hide it and match the bike, BUT IT WORKS! ;D Thanks, Pete! |
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Post by srinath on Nov 16, 2009 22:03:50 GMT -5
Hey I had a question. Why is the need for 2 of the radio shack units. To cover the wires out of the stator ?
I had another question.
I have seen tons of electronic parts that have various similar items @ automotive junkyards. Would any of those be useable as a rectifier. If so what should I look for ?
Thanks.
Srinath.
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Post by pamcopete on Nov 17, 2009 12:35:55 GMT -5
srinath,
Yes, there are 3 stator wires. Each rectifier can handle just 2. You are left with a spare set of diodes that can be used in the event of a failure of one of the other three sets.
There are three phase rectifiers available that will accomodate all three wires in a single case, but they are very expensive mainly because most three phase systems are very high voltage and require a rectifier that can handle the high voltage.
The Radio Shack rectifiers cost $3.29 each. Why would you want to use used parts?
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Post by retiredgentleman on Nov 17, 2009 12:36:41 GMT -5
The alternator on these bikes is a 3 phase alternator, and each phase needs 2 diodes for full rectification, which means we need a total of 6 diodes.
We could use 6 individual diodes, but smart people such as Pamcopete looked around, and said we can use 2 bridge rectifiers to come up with the required 6 diodes. Bridge rectifiers are commonly used in power supplies ( makes them cheap and plentiful) for full wave rectification where each one needs to have 4 diodes. So 2 bridge rectifiers fill the bill and you have 2 diodes left over.
Edit;.......Oops, I guess I input this message at the same time as pamcopete.
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Post by pamcopete on Nov 17, 2009 12:44:16 GMT -5
RG,
Great minds think alike....and sometimes arrive at the same place at the same time.....
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Post by srinath on Nov 18, 2009 3:56:17 GMT -5
srinath, Yes, there are 3 stator wires. Each rectifier can handle just 2. You are left with a spare set of diodes that can be used in the event of a failure of one of the other three sets. There are three phase rectifiers available that will accomodate all three wires in a single case, but they are very expensive mainly because most three phase systems are very high voltage and require a rectifier that can handle the high voltage. The Radio Shack rectifiers cost $3.29 each. Why would you want to use used parts? I was thinking 2 things. If we got a rectifier with the right number of plugs etc, it will be easier wiring it up. The other thing is I prefer using automotive components as opposed to radio shack ones cos they are meant to resist weather, vibration and on/off/high/low cycling like the cars do much like bikes. Auto stuff is nearly free - 1 buck per generic relay and I need to scround parts for this lebaron of mine anyway. If its a swap in off a car, I should get it cheap and be home free I thought. Since I dont know what I am looking for ... I am SOL, so I thought I ask. Cool. Srinath. |
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Post by srinath on Nov 18, 2009 4:02:31 GMT -5
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Post by pamcopete on Nov 18, 2009 7:02:15 GMT -5
srinath,
Well, the Radio Shack rectifiers are potted so they will withstand a lot of abuse. I've been using them on my '78/E for 10 years.
The rectifiers that you found on Ebay would probably work as well. The three terminals would have to be isolated and connected to each of the white wires from the stator. You could probably use a piece of 1/8 aluminum plate with three matching holes and insulator kits that would include a special insulated shoulder washer to mount the three terminals in the three holes without shorting to ground.
The cost is still a consideration. I wouldn't recommend used parts for this application when you can get new for $6.58. The cheapest one that you found was $8 plus $5 shipping plus the cost of the insulating mounting kits, but it is an interesting idea, so just do it and let us know how it worked out.
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Post by mrriggs on Nov 18, 2009 13:08:00 GMT -5
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Post by srinath on Nov 18, 2009 23:25:07 GMT -5
Mr riggs totally will check your thread out. Must read all the rigging posts pn this site. Super cool.
The rectifier is inside the alternator right. I have a ford alternator lying about I might as well crack it open and see what gives. My fear is it may be too big to fit in the little crevise the stock R/R sits in. Almost defeats the purpose, cos I wanna have it fit and work in the stock location.
Pamcopete - Defintely will post what happened, but good to know 10 yrs on the radio shack item. You dont think in 10 years their quality crapped out ? They just wanna sell cell phone junk nowadays. The clowns dont even know what a transistor is ... heck not even what a transistor radio ...
Cool.
Srinath.
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