Hi, since so many of you seem to be moving to PS3, is there anyone with a stash of BCR's that I can start swapping into my PS1 locos?

I'd be interested in up to 8 of them at the moment. 

Thanks!

 

Original Post

Jeff - I presume you are trying to find some "used" ones to save some $$.

If you don't end up finding any used....

I'm sure you know the firm in Pennsylvania still makes them - I just bought a new one

for an older  PS-1 engine I have.  I have them in all my PS-1 (and PS-2) engines -

as you know, they are worth every penny!

 

I actually make my own, they're pretty simple.  I just use two series supercaps and a Keystone battery clip.  Heatshrink the whole assembly and you're done.

Finished 9V Battery Replacement

9V MTH Supercap Battery Replacement N1

 

What's under the hood

9V MTH Supercap Battery Replacement N2

Attachments

Images (2)

I use AVX or Nesscap 5.0V 1.5F caps.  The battery clip is made by Keystone.  I buy the caps in quantity for some of my products.

Yes, it's really that simple.

I will be making several of GRJ designs for my older PS1 units. Very simple and great idea he came up with. 

gunrunnerjohn posted:

Because you need higher voltage rating than 5V.

Right.  It was early this morning and I didn't notice the decimal point in the voltage rating in the picture.  Thanks for the reply.  I have no experience with these supercaps.  Does the voltage equalize well across the series pair.  In the old days putting electrolytic caps in series required a high value resistor in parallel with the two caps to equalize the voltage division.

If the caps are matched, there is no need for balancing.  There's no harm in adding a high value resistor, say 10k, across each cap.  You could use a very small resistor, 1/8W would be plenty.  Since I buy name brand caps in quantity, they're all coming from one lot, and they're matched.  Note that the 5V caps are really two 2.7V caps internally, and they don't use any balancing for those.  I'm guessing they're thinking any small imbalance will be covered by the .2V margin they allowed.

gunrunnerjohn posted:

If the caps are matched, there is no need for balancing.  There's no harm in adding a high value resistor, say 10k, across each cap.  You could use a very small resistor, 1/8W would be plenty.  Since I buy name brand caps in quantity, they're all coming from one lot, and they're matched.  Note that the 5V caps are really two 2.7V caps internally, and they don't use any balancing for those.  I'm guessing they're thinking any small imbalance will be covered by the .2V margin they allowed.

GRJ, thanks very much for the details.  It is great that you are willing to share your knowledge and experience on this forum.

Thanks a bunch GRJ.  I'm going to try my hand at a couple of these.

 

Just to be clear, the Positive side of the series of capacitors goes to the "button" part of the snap connector (just like a normal 9V) and the negative side goes to the "cup" side?

Last edited by Jeff_the_Coaster_Guy

Hay John,

 I'm not trying to stir up trouble, but Marty Fitzhenry always said that BCR's shouldn't be put into PS-1 engines. Apparently he had a bad experiance with that combo, and I never found out what that experiance was. Can you explain, if any?

     Steam Forever

            John

Hay Ron, 

Appreciate your answer on the BCR, but it doesn't explain why Marty F. was against using the BCR on PS-1. If anyone like GRJ can give me the reason, then it satisfy's my inqisivetiveness. I'm not saying it won't work, I just want to know why (Marty must have had a reason, and I respect it) he didn't approve  of it!

     Steam Forever

           John

I don't know why Marty didn't like them, and sadly we can no longer ask him.  My only precaution is not to put them in the early 5V PS/2 boards, I've gotten a number of them dead with a BCR.  I don't know that it was the BCR, but it gave me pause...

Hay John,

Thank You for your response! I guess I may have to learn through experience as time goes by, only hoping that it's not too costly of a lesson to learn!

Mistakes lead to a gain of wisdom!!!

Steam Forever

       John

GRJ,

I'm a little nervous now.  I'm using a BCR in a couple of 5V PS/2 engines.  So far - so good.  Let's hope that the issues you ran into were due to something other than the BCR's.

Ron

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