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    • January 5, 2020 7:05 AM EST
    • Does Timmyd understand how to wire supercaps in series?  Not everyone understands series wiring and polarity sensitivity.

       

    • January 4, 2020 3:12 PM EST
    • email should be there now Tim

       

      I agree with Todd, I would try the supercap route.

       

      I was referencing this statement: " So, reading all of this is making my head spin." So I was trying to help reduce spin rate ha ha!

       

      Greg

    • January 4, 2020 9:10 AM EST
    • David Maynard said:

      The charge voltage IIRC is 7 volts,

      To remove hot melt glue, I use 90% isopropyl alcohol on a cotton swab. Keep rubbing along the edges of the glue blob, the alcohol will wick in between the glue and the item and eventually release the glue.

       

      Thanks David, I will try this

    • January 4, 2020 9:09 AM EST
    • Greg Elmassian said:

      1. An identical battery will stop your head spinning. It will most likely last a while. It's your decision to try the super cap route, if you want.

      2. add the jack and use to charge, or let it charge on the rails, but you will have to wait a bit before the sound comes on, even with a healthy battery. The longer between uses and/or slower the loco runs the longer it will take to charge.

      3. leave it in the sun to warm a bit and peel away, slowly, usually it gives up.

       

      Greg

       

      p.s. I replied to your email on the 28th... maybe you missed it?

       

      My head isn't spinning.  I just don't understand all the electrical jargon.  As such I have no idea what a "super cap" is or how to use it.  I can probably add a jack with clear installation instructions.

      I didn't miss your email, I never received it.  And yes, I checked and have been watching the JUNK folder for it.  Perhaps you can resend it?

       

      Thanks

    • January 4, 2020 8:15 AM EST
    • The charge voltage IIRC is 7 volts,

      To remove hot melt glue, I use 90% isopropyl alcohol on a cotton swab. Keep rubbing along the edges of the glue blob, the alcohol will wick in between the glue and the item and eventually release the glue.

    • January 4, 2020 7:29 AM EST
    • Does anyone know the voltage for recharging the battery without the battery connected?  Many times batteries were used to regulate the power and the charge voltage was higher than the battery rating for lead acid units.  Take a car for instance, battery is 12.6 volts but charge voltage can be as high as 14 volts, so supercaps need to be above the max voltage seen.

    • January 3, 2020 7:55 PM EST
    • 1. An identical battery will stop your head spinning. It will most likely last a while. It's your decision to try the super cap route, if you want.

      2. add the jack and use to charge, or let it charge on the rails, but you will have to wait a bit before the sound comes on, even with a healthy battery. The longer between uses and/or slower the loco runs the longer it will take to charge.

      3. leave it in the sun to warm a bit and peel away, slowly, usually it gives up.

       

      Greg

       

      p.s. I replied to your email on the 28th... maybe you missed it?

    • January 3, 2020 5:03 PM EST
    • You are all most helpful and very well versed in the electronics of things.  However, I am not.  I am a musician and photographer.  So, reading all of this is making my head spin.  So please bear with me and let me ask a few questions:

      1. I am guessing from everyone's response here is that the battery to this sound card is more than likely dead.  If so, what exactly do I need to replace it with?

      2. There is no jack on this locomotive to charge the battery, so assuming I am able to 1) determine what I need to replace the existing one and 2) able to install it, how do I keep it from going dead again?

      3. The battery appears to be hot glued to the underside of the coal load.  What is the best way to get it off?

      Thanks guys for all of your help here.

    • December 30, 2019 5:11 PM EST
    • Todd, I was writing as a general example, as many people would try 2 caps thinking it was "close enough" in voltage, as I do state in my post.

       

      Trying to give some basis in fact and reasoning, not just present a recipe without explanation.

       

      Greg

    • December 29, 2019 2:45 PM EST
    • Except that you don't use two, you use three as the link I presented shows.  3 x 2.7 = 8.1 volts, which is well over the Sierra charge voltage.  And you will notice that I did NOT link 2.4 volt caps that are also available, but would be right at the limit of what the Sierra charges at.

       

      Nor did I link the 10F caps which will give you more "shutdown time" at the expense of more motorboating (and a longer "near short") before attaining a working voltage to sustain the system.

       

      I don't even turn my sound systems off between uses.  There is no need to do it.

    • December 29, 2019 1:43 PM EST
    • Yeah, I would be a little concerned about two 2.7 volt supercaps in series, which gives you a 5.4 volt cap, so you would need 3 of them, which is what I assume Todd did, 3 in series give you 8.1 volts, which should give you plenty of margin, given the "charging circuit" from the Sierra. When "building up" multiple caps, realize that supercaps are VERY intolerant of over voltage.

       

      I would also agree with the 1 ohm resistor, in case you have a sensitive short circuit detector in your setup. All good suggestions and better than the actual battery in my opinion too.

       

      Greg

    • December 29, 2019 7:18 AM EST
    • Try these for higher voltages with super caps wired in series.

      6 pieces for $4.11 and free shipping., less $$ in bulk!!

       

      https://www.ebay.com/itm/6pc-2-7V-10F-Cylindrical-Ultra-Super-Farad-Capacitor-High-Power-Supercap-10x26mm/113702182907?hash=item1a792d9ffb:g:sr0AAOSwTHlcnvSd

    • December 28, 2019 5:12 PM EST
    • Use these wired in series to replace the battery and never worry about the battery (including charging it) again.  If you worry about the load, put a 1 ohm resistor in the series.  I do this on my Sierras (without a resistor) and have never had a problem.

       

      Depending on the volume setting, the sound will continue for about 30-45 seconds after the engine stops receiving power.  The lights will continue a bit beyond this.  This is enough to get some of the shutdown sequence of the sound system.  10F caps have also been used with success and prolong the shutdown sequence.  In either case, ther will be a bit of initial "motorboating" when the power comes back on.  It does no harm and lasts a whole lot shorter than when the lead acid battery runs down.  Even so, there is a way around this using a small relay and associated small capacitor to uncouple the supercaps prior to their fully discharging so that some charge is retained and you don't start from scratch when the power comes back on.

       

      https://www.ebay.com/itm/3pcs-2-7V-6F-2-7V-ELNA-DZ-Farad-Super-Capacitor-10x30mm-For-Power/112096523616?hash=item1a19793560:g:EqIAAOSwaB5Xr-1D

       

       

    • December 28, 2019 12:15 PM EST
    • I am not clear what I should get to replace the existing battery.

      Any chargeable battery with the same voltage rating will do if you are running track power.  Or do without and the sound stops when you stop the track power.

      However, most people use battery power for the loco, which can be used to feed the Sierra without a 'keep alive' battery. You do need an optical isolator which they used to supply.  Greg probably knows where you can get a replacement. 

       

    • December 28, 2019 9:20 AM EST
    • The local Batteries plus actually sells the same lead acid gel batteries that came with the Sierra boards. I replaced mine with NiMh batteries.

    • December 28, 2019 8:47 AM EST
    • Pete Thornton said:
      Craig Townsend said:

      Sierra sound board for sure. The two screw terminals give it away, and the two buttons for "programming". Not sure on the other board.

      It was the battery that told me it was Sierra.  That's a lead-acid (as used in home security systems 20 years ago) gel battery and is undoubtedly dead.  It is supposed to charge as you run along and keep the sound going when you stop.  If you google "sierra sound battery replacement" you should get some ideas.

       

      Doing a Google search for Sierra sound battery replacement returns many articles from years ago.  So, I am not clear what I should get to replace the existing battery.

    • December 28, 2019 8:39 AM EST
    • Greg Elmassian said:

      Timmy, I have the Sierra manuals if you need/want them, email me if you do.

       

      Greg

       

      Email sent.  Thanks!

    • January 5, 2020 7:04 AM EST
    • Greg, 

      Jerry's going to try to duplicate a gear for us, if it will work. I'll try to show some pictures of the final product when he's done. It goes out to him Monday. Thanks for your help along with everyone else! Ken