Model Railway ElecTrainics - DIY Keep Alive - Stay Alive

Model Railway ElecTrainics - DIY Keep Alive - Stay Alive - Important UPDATE!

Рет қаралды 3,055

2 ай бұрын

Important Update to my Keep Alive Video!
Thanks to everyone for the technical information on how to wire multiple capacitors together.
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Пікірлер: 48

@stevemcgeachy6953 2 ай бұрын

The thing I like about your channel is the mistakes. You never sugar coat what you do so everyone can learn together. Love it!

@ScottRails 2 ай бұрын

Thanks Steve. I hate watching videos where everything is made to look simple, but when you try it, it fails.

@fredhampton8317 2 ай бұрын

Learning from mistakes. 👍🙂 Means ur solving problems, Dave, and educating us as well. 👍

@user-uk8jr6zc9l 2 ай бұрын

No harm no foul.

@theangelsmodellingandrailways 2 ай бұрын

That's a great result dude, you've figured it out with the help of subs, always good. Look forward to seeing all those coaches done.

@kurtstrains 2 ай бұрын

Try this order: Bridge Rectifier 1st, caps 2nd, trim pot 3rd, leds last

@ScottRails 2 ай бұрын

I'll try that before I do the next coach

@geesharp6637 2 ай бұрын

Yah, I put the resistor between the rectifier and LED strip. I followed the following video when I did my cars. kzfaq.info/get/bejne/fq9mlKiBvcnbe58.html

@majortomtogc 2 ай бұрын

Long cars, good track wiring, no flicky-flick. Good Stuff!

@MrMagicFingers1 2 ай бұрын

There is no need to pry ion the glue or heat it back up... Simply put a few drops of 70% (99% ideally) IPA (rubbing alcohol) on the joint. The IPA will wick and migrate through the joint and free the two surfaces. Fun fact. ;) - Tim

@HartfordWhaler 2 ай бұрын

Great post, but you’re modeling too far north. Need some Amtrak and other US railroads! I’ll be in Scotland this summer and plan to take some train videos for my channel. Cheers!

@thomasdecker7631 2 ай бұрын

One of my college roommates was an electronics student. He told some stories about the pranks those guys played on each other with capacitors. Years later, when I was running my shop with a phase convertor, I was using some pretty hefty capacitors and knew enough to be careful. BTW, Thanks for the update.

@HHExpress 2 ай бұрын

Nicely Done Dave, However it is better to have the Capacitors wired directly to the bridge rectifier before you hook the LEDs. I also saw that you put the variable resistor in front of the Bridge Rectifier. this should be also after. so best is. Bridge Recifier --> Capacitors --> variable resistor --> LED strip.

@ScottRails 2 ай бұрын

Thanks Hai, I'll try that on the next one.

@SpringCottageModelRailway 2 ай бұрын

This is what I was thinking. The caps are “charging “ up and discharging their max voltage rather than the controlled voltage otherwise.

@LarsPW 2 ай бұрын

@@SpringCottageModelRailway Nope, they don't. If you give the capacitors 12 V they cannot exceed 12 V when discharging them regardless of their maximum voltage.

@SpringCottageModelRailway 2 ай бұрын

@@LarsPWokay what’s the benefit of the above order then?

@davidjburgess 2 ай бұрын

@@LarsPW thanks this is good to know.

@openeyes-411 2 ай бұрын

Scott you say it defys logic, but it really doesn't... Think of it as if you wire two 1.5v batteries together; in series, you double the voltage - but in parallel, the voltage remains the same, but you double your current. And it's the current that does the work...

@Mike__B 2 ай бұрын

Good catch, in series 1/Ceq = 1/C1 + 1/C2 the voltage doubles though, not that you need that for this situation though. Still think you could have gotten away with doubling your resistance and only using one capacitor.

@jimc8254 Ай бұрын

Only just seen this - nice, but 16V capacitors on 15V supply - perilously close over voltage on cap [they do go bang] if you get spike from PSU. Options: Add Zener diode [voltage limiter], Replace capacitors with 25V [next general purpose voltage], Add 2 more caps, so you have 2 pairs of in series capacitors [in series does 1/2 capacitance but doubles your max voltage] in parallel. Also worth checking you input pot - where the capacitors are concerned, it's function is to limit the current into the capacitors when power is supplied [AKA in rush current] as too much current could damage your controller, as an uncharged capacitor is near enough the same as dead short when 1st turned on and the larger the capacitor [moving from in series to in parallel you have increased the capacitance X 4] the most current will flow in the 1st few seconds. Max voltage you'll get on 15V supply stored in capacitors is 15V - that will not give you a zap. You could also change the capacitors from standard to Super Caps - these have much higher capacitance BUT much lower voltage [typically 2.7V or 5.5V] in a SERIES stack [typically 5 x 2.7V == 13.5V {so you MUST have protection or add another cap ) 1F capacitors gives you effective 200,000uF [at max 13.5V PUS] vs the 4400uF [at max 16V PSU] the 2 caps you using provides - possible overkill for you neat lighting set up but other functions... Cheers - JCMP

@ScottRails Ай бұрын

That's a lot of great info, thanks.

@caboosech 2 ай бұрын

Take your time be safe

@billfusionenterprise 2 ай бұрын

When I get a chance I would do a circuit with the caps, but after caps use a voltage regulator at 5 volts at run leds at 5 volts. There will no brightness change until the caps go below 5 volts

@charlie1872 2 ай бұрын

my apologies Dave, it turned out to be a Via bus and not a Greyhoubd👍

@joeraderblackrockcentralrr 2 ай бұрын

great fix

@casstelles 2 ай бұрын

I'm glad to see the update went well. Could you add more capacitors in parallel to up the capacitance? Well, yes, but space in the passenger car could be an issue after a while. I think the current setup for the circuit is just about right or close enough to work well.

@ScottRails 2 ай бұрын

Yes, after cleaning all the pickups it's working great.

@Faresplease 2 ай бұрын

Success 😊

@bigwoz78 2 ай бұрын

Looks fantastic, I’ll definitely be using this. Thank you

@dundasjunctionmodelr.r-jam8267 2 ай бұрын

Great job

@dennissnow2674 2 ай бұрын

it come out good cant wait to see your next one tc

@raymondwells5807 2 ай бұрын

capacitors in parallel ADD and Resistors in parallel SUBTRACT

@monsvillerailways5736 2 ай бұрын

Good stuff Dave. What wattage is your soldering iron? Mine takes ages to melt the solder where yours melts at a touch. Happy Modelling

@ScottRails 2 ай бұрын

It's a digital adjustable job I got on Amazon, but it's no longer available. I was having the same issues you have with previous cheap irons so I splashed out. Here's the link so you can get an idea of the specs. www.amazon.ca/gp/product/B0987H26KP/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

@PaulFotschky 2 ай бұрын

Could that work for a 12v dc motor rather than the lights, so I can have a keep alive for a short wheel base dc loco?

@ScottRails 2 ай бұрын

I will be trying that soon, but here's what I have learned.... The capacitors can only charge up to whatever voltage is being sent. So on DC, if you are running your loco slow, it might only have about 2 volts going through it, and therefore only 2 volts of stored power. So it will work for a very short time, and immediately start slowing down. The difference with DCC, or AC power, the capacitors are getting a full 15 to 18 volts charge all the time, even if your loco is crawling along. And, the motor will be drawing a lot more power than an led. I will of course test all this soon.