facebook1 youtube1 twitter1 instagram linkedin1 pinterest1

NOTICE:  If you are not a free registered member of the site, you will not see the photos in the forum, and you won't be able to access our premium member content. Please consider joining our community! REGISTER AND MAKE THIS BOX DISAPPEAR!

×

Pictures Posting Not Working (12 Jun 2023)

Picture uploads is again unavailable. We are working on the problem. Thanks for your patience.

Makotosun

Margin for error on 6v voltage regulators

  • Gr8uncleal
  • Gr8uncleal's Avatar Topic Author
  • Online
  • Site Supporter
  • Site Supporter
  • Posts: 4703
  • Likes received: 2533

Margin for error on 6v voltage regulators was created by Gr8uncleal

On the face of it, this might seem like a daft question, but hey, if you don't ask, you don't find out!

In amongst a job lot of parts that I have just bought from the US (some of which I actually needed! 

This image is hidden for guests.
Please log in or register to see it.

), were four used, 6v, single (yellow) wire voltage regulators. All are Stanley and came off Yamahas.

I have bench tested them using a 12v battery and the readings I got were 7v, 8v, 8v and 9v. My question is, will they all prevent the headlight blowing?

Also, what is the small screw on the front for?

Thanks very much.
Last edit: 18 May 2021 02:34 by Gr8uncleal.
18 May 2021 02:32 #1

Please Log in or Create an account to join the conversation.

  • Posts: 10829
  • Likes received: 4695

Replied by RT325 on topic Margin for error on 6v voltage regulators

That's very interesting but i'm not sure i understand how you're testing it. I'm sure its just my problem how i'm reading the story, but it limits ac volts before it goes to dc after the rectumfrier. Lets know a bit more please. Screw does nout & probably just hold something inside to complete the circuit to the body as that's how it's earthed. That's all a total guess haha.
Last edit: 18 May 2021 04:47 by RT325.
18 May 2021 04:46 #2

Please Log in or Create an account to join the conversation.

  • Gr8uncleal
  • Gr8uncleal's Avatar Topic Author
  • Online
  • Site Supporter
  • Site Supporter
  • Posts: 4703
  • Likes received: 2533

Replied by Gr8uncleal on topic Margin for error on 6v voltage regulators

12v battery direct to volt meter reads 12v. Tick.

6v regulator inserted between one of the wires from the battery to tester (doesn't matter which) and reduced voltages displayed.

So, the regulators are working, but enough to stop a 6v headlight bulb from blowing is the £5 question!
18 May 2021 04:56 #3

Please Log in or Create an account to join the conversation.

  • Posts: 10829
  • Likes received: 4695

Replied by RT325 on topic Margin for error on 6v voltage regulators

I just googled for one & one i found led me right back to the forum. Not sure when but it had gone from ebay so saved the pic from the forum page as ebay link doesn't work. But what i was rambling about is it was on ebay as suit 6 or 12 volt which isn't correct. Prove me wrong please. But might explain why Gr8uncleal is testing it on 12. Come in ''Gr8uncleal" please. 
Last edit: 18 May 2021 05:00 by RT325.
18 May 2021 04:57 #4

This message has an attachment image.
Please log in or register to see it.

Please Log in or Create an account to join the conversation.

  • Gr8uncleal
  • Gr8uncleal's Avatar Topic Author
  • Online
  • Site Supporter
  • Site Supporter
  • Posts: 4703
  • Likes received: 2533

Replied by Gr8uncleal on topic Margin for error on 6v voltage regulators

A 12v battery is the only means I have of testing if the regulator is actually regulating as it should - cheaper than fitting them and watch as a series of bulbs blow as they are fed 18+ volts! 

This image is hidden for guests.
Please log in or register to see it.

This image is hidden for guests.
Please log in or register to see it.

18 May 2021 05:02 #5

Please Log in or Create an account to join the conversation.

  • Posts: 10829
  • Likes received: 4695

Replied by RT325 on topic Margin for error on 6v voltage regulators

I'm lost now lol as thought they're for AC only. Someone else's turn. Bed time here.
The following user(s) Liked this Post: MarkT, brigsy, Gr8uncleal
18 May 2021 05:03 #6

Please Log in or Create an account to join the conversation.

  • Posts: 14515
  • Likes received: 10726

Replied by MarkT on topic Margin for error on 6v voltage regulators

They are AC regulators, not DC.  Might damage them connecting to DC?  Not sure.  DEET might know. I think I remember someone else trying to regulate the battery after the rectifier and destroying the regulator...  not sure though.

Screw on original Yamaha regulator holds a component (transistor?) tight to the (heat sink) case.  It's not an adjustment if that's what you're wondering.

DEET has a video on bench testing that might give some ideas or the later electro-tester had a regulator test function I believe.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
The following user(s) Liked this Post: Gr8uncleal
18 May 2021 07:15 #7

Please Log in or Create an account to join the conversation.

  • Gr8uncleal
  • Gr8uncleal's Avatar Topic Author
  • Online
  • Site Supporter
  • Site Supporter
  • Posts: 4703
  • Likes received: 2533

Replied by Gr8uncleal on topic Margin for error on 6v voltage regulators

Thanks chaps.

Hopefully I haven't damaged anything! 

This image is hidden for guests.
Please log in or register to see it.

18 May 2021 07:28 #8

Please Log in or Create an account to join the conversation.

  • Posts: 1262
  • Likes received: 675

Replied by msavitt on topic Margin for error on 6v voltage regulators

My understanding - which is limited to two bike and two regulators - is that regulator is designed to attenuate AC current.  I bought two Yamaha 6V regulators on eBay (<$20) and connected its yellow lead up to the blue headlight / meter light wire and grounded the case.  In one bike the L and H beams are limited to just under 6V when racing the engine, and in the other bike just over 6V.  In both cases the voltage is really high - as in 15 o 17V without regulator, so I know it is working and I have not popped a single headlamp since the first one.


 
The following user(s) Liked this Post: nhsteve
Last edit: 18 May 2021 08:14 by msavitt.
18 May 2021 08:13 #9

Please Log in or Create an account to join the conversation.

  • Posts: 427
  • Likes received: 230

Replied by nhsteve on topic Margin for error on 6v voltage regulators

Just curious as to where you wound up mounting that? It is fairly sizable as I recall, when looking at them.
22 May 2021 07:02 #10

Please Log in or Create an account to join the conversation.

Moderators: yamadminMakotosunDEETVinnieJames Hart