Win some/Lose some

"HammerheadFistpunch" (hammerheadfistpunch) 04/29/2020 at 14:38 • Filed to: None

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Current state of the bike

rear triangle fully pulled apart and bearings driven out. Just ordered a new bearing kit (surprisingly affordable and available) and I will be converting it rfom a 3x9 to a 1x11 and getting new tires and if the stars align a drop post. The win is that

A: I was able (with considerable effort) to get all the old bearings out.

B: I could find a replacement kit and not have to look for bearings individually

C: The bearings and the drivetrain parts are WAY more affordable than I was expecting.

The lose is that my project to add a MBP charger to the cruiser has failed. I bought this

!!! UNKNOWN CONTENT TYPE !!!

Which promised me it could put out 64 watts at 20v for charging....if you feed it 24v.  So I bought a 24v converter which finally arrived from china a month later and works perfectly.  When I hook it all up though?  doesn’t work.  The MAC sees 5v and 20v alternatively and wont settle on a voltage and so no current will flow.  Balls.  I bought switches, relays, converters, etc.  All to wind up back at square one.  On well.  I could keep chasing this dragon and adding resistors to step down the voltage to 20v to see if it works, but I have a feeling it wont.  maybe I’ll create a pencil resistor just to see and go from there. 

Highlander-Datsuns are Forever > HammerheadFistpunch 04/29/2020 at 14:52

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If you are going to 11, why not 12?

SRAM 11 speed in GX is very reasonably priced these days .

TheRealBicycleBuck > HammerheadFistpunch 04/29/2020 at 14:52

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First sign of the Serious Cyclist - a proper bike stand. I’ve been wrenching on bikes for years and never gave myself that luxury. 

HammerheadFistpunch > Highlander-Datsuns are Forever 04/29/2020 at 14:53

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12 wont fit with my current hub, 11 is max with the hub I have and while I can build wheels in my sleep (and I love doing it) its an added expense I don’t want to deal with.

HammerheadFistpunch > TheRealBicycleBuck 04/29/2020 at 14:56

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Best investment EVER. I use it for everything. I can clamp a piece of wood in the jaw and turn in 90 degrees for instant small table. I use it for a shower stand with a solar shower. projector stand. pretty much anything that needs a stand

farscythe - makin da cawfee! > TheRealBicycleBuck 04/29/2020 at 14:57

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i still do pretty much everything with the bike sitting upside down.......it kinda shows on the saddle and shifters....heh

HammerheadFistpunch > farscythe - makin da cawfee! 04/29/2020 at 15:00

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I’ve done that for sure, but man a bike stand makes life better.

Snuze: Needs another Swede > HammerheadFistpunch 04/29/2020 at 15:00

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Re. the voltage thing, is a 20v Zener diode not available? (I don’t normally look at these things, so I don’t know).  

TheRealBicycleBuck > HammerheadFistpunch 04/29/2020 at 15:01

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Now I know what I’ve been missing.

“HONEY! I KNOW WHAT I WANT FOR FATHER’S DAY!”

Nom De Plume > HammerheadFistpunch 04/29/2020 at 15:01

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What of the myriad options are you choosing for a front ring?

For a second there I thought you had a dynamo on the front hub of a cruiser bicycle. And were having problems adding a stem topcap USB.  

HammerheadFistpunch > Snuze: Needs another Swede 04/29/2020 at 15:05

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I don’t know what a zener diode does or how to find one suitable for my application.  

HammerheadFistpunch > TheRealBicycleBuck 04/29/2020 at 15:10

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get a folding one or don’t get one IMO. Tripod is best

NOTE: used to be a professional bike mechanic, have tried them all.  Unless its bolted to the floor, tripod is best.

HammerheadFistpunch > Nom De Plume 04/29/2020 at 15:11

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oh man, I haven’t even looked into gearing yet.  

farscythe - makin da cawfee! > HammerheadFistpunch 04/29/2020 at 15:12

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i do not doubt that....its one of those things i need to get...but somehow never do... mostly coz moneys tight and its one of those things that can always wait..

TheRealBicycleBuck > HammerheadFistpunch 04/29/2020 at 15:16

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That’s good advice. Thanks.

Snuze: Needs another Swede > HammerheadFistpunch 04/29/2020 at 15:22

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So the problem with step down resistors is that they are proportional to input voltage, so as input voltage fluctuates, output voltage fluctuate. Your 64w @ 20v means 3.2a of current, so you are going to need a bigboi resistor to dissipate the power, too.

A zener diode is a p-n junction (solid state) device that can regulate voltage as long as it’s supplied with more voltage than necessary. If you google “zener voltage regulator” you can get some info. It’s a simple circuit. The problem is my knowledge falls off at about this point - I don’t know how to properly select the right size diode or series resistor for your application. And the issue is you’d still need that 24v, so if that’s the source of your heartache, this isn’t much help.  

Nom De Plume > HammerheadFistpunch 04/29/2020 at 15:27

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Haha, sorry. My focus unexpectedly shifted slightly toward mtb.

Wishing you luck with the 12v cig lighter plug adapter.

Tripper > HammerheadFistpunch 04/29/2020 at 15:37

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1x11 FTW. I had no idea how nice life could be!

HammerheadFistpunch > Snuze: Needs another Swede 04/29/2020 at 15:54

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I’ve got a converter than steps up to a steady 24.3 volts regardless of input so the voltage fluctuation and 24v volt issue are solved.  The thing is even if I feed the stupid thing with exactly 19.2 volts I don’t know if it would work.

HammerheadFistpunch > Nom De Plume 04/29/2020 at 15:55

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I should be able to sort out gearing pretty easily once I sit down and think about it. But I need to make sure the big stuff is handled first, like dimensions and spacing.  

Future next gen S2000 owner > HammerheadFistpunch 04/29/2020 at 15:59

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I can’t get the factory USB in the Taco to give a meaningful charge to my phone. Good luck.

HammerheadFistpunch > Future next gen S2000 owner 04/29/2020 at 16:06

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I’ve 4 USB 2.4 amp outlets that are kicking ass right now but cheap stuff is cheap and I got what I paid for.

Nom De Plume > HammerheadFistpunch 04/29/2020 at 16:19

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For that massive 10 -69 cassette or whatever they are up to.  

HammerheadFistpunch > Nom De Plume 04/29/2020 at 16:21

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Man, I grew up racing on 11-28's. anything over 30 was wuss country.  Now I will take what I can get.

Nom De Plume > HammerheadFistpunch 04/29/2020 at 16:48

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So flat here I broke down and bought a 80's road bike that fits CX tires and made it into a SS for the very large anything that isn’t a race ride.  I do miss the mountains until I consider how bad I’d suffer on a small climb anymore.

Snuze: Needs another Swede > HammerheadFistpunch 04/29/2020 at 16:51

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What’s the thing you’re trying to provide power to?  Sorry, I’ve seen a few of your posts and know you’re trying to power something, but can’t remember all the details.  

HammerheadFistpunch > Snuze: Needs another Swede 04/29/2020 at 16:54

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MacBook

Snuze: Needs another Swede > HammerheadFistpunch 04/29/2020 at 17:05

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Oh right, now I remember, you want to plug it in directly, not run through an inverter.

I think it may be a bit more complicated than what you are thinking. Have you looked at a MacBook pinout? There’s a “Charge Sense” pin - I think there are some control electronics in the powerbrick that controls the charge rate, which is really important with LiPo batteries because it’s really easy to toast them, with disastrous results (see Samsung Galaxy S7 fires, etc.)