gear ratio ? - Electronic Circuits Projects Diagrams Free

williB · 22nd October 2005, 01:45 AM

I need to calculate the gear ratio of the attachment..
this is whats inside the crank flashlight
i figured it to be 94.97:1 ?
sound correct??

Russlk · 22nd October 2005, 02:10 AM

I get 94.62

williB · 22nd October 2005, 02:26 AM

cool !
i'll post a pic of it when my camera batteries recharge..

williB · 22nd October 2005, 02:55 AM

its really neat
its got three , sort of bright ( by luxeon standards) white LEDs..
and a rechargable Li-ion cell and a little motor/generator putting out dc , into a full wave bridge rectifier..
AND a 94 : 1 gear ratio.. :lol:

Oznog · 22nd October 2005, 04:54 AM

I have one of those! I had to take it apart of course.

After checking the crank's short circuit current and looking up the battery capacity, I found the charging abilities of that generator appeared greatly exaggerated. Without recalling the numbers, it would have taken an excessive amount of crank time to charge the battery and at the normal power for 3 LEDs it could drain it in a pretty short time. Since LED current goes down as the battery discharges it would take a really long time to actually run the battery down entirely but the period of useful LED power is rather brief.

Still, a fun toy.

After seeing that guy on the net selling handheld green laser diodes capable of burning stuff and generally being extremely dangerous, I had the idea of adapting that hand crank to charge a battery to power it. A hand crank burning laser. Sadly, not only were they quite expensive, he quickly closed his doors after getting all sorts of "inquiries" from government agents. Since they'd just had this slew of blinded pilot reports from what may have been 5 mW greens, the internet sale of 500mW ones had them "concerned".

williB · 22nd October 2005, 06:35 AM

Of course , thats the first thing i did too ( took it apart)..
then i let it run down ( by leaving it on ), surprizingly it took all night to to run down initially..
your right that once it is run down ,and after a short crank , it only stays really bright for a few mins. but you can just crank it up again..
Anyway i want to use the crank and gears for my new generator , i think it will work..

audioguru · 22nd October 2005, 01:59 PM

Your arm will fall off from cranking that thingy. :lol:

panic mode · 22nd October 2005, 02:43 PM

maybe it's some sort of fitness equipment :-D

1

39/12)*(39/12)*(40/12)*(43/16)=1:94.62239583

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

22nd October 2005, 02:10 AM	(permalink)
Russlk	I get 94.62 __________________ see my website: www.geocities.com/russlk

22nd October 2005, 02:26 AM	(permalink)
williB	cool ! i'll post a pic of it when my camera batteries recharge..

22nd October 2005, 04:54 AM	(permalink)
Oznog	I have one of those! I had to take it apart of course. After checking the crank's short circuit current and looking up the battery capacity, I found the charging abilities of that generator appeared greatly exaggerated. Without recalling the numbers, it would have taken an excessive amount of crank time to charge the battery and at the normal power for 3 LEDs it could drain it in a pretty short time. Since LED current goes down as the battery discharges it would take a really long time to actually run the battery down entirely but the period of useful LED power is rather brief. Still, a fun toy. After seeing that guy on the net selling handheld green laser diodes capable of burning stuff and generally being extremely dangerous, I had the idea of adapting that hand crank to charge a battery to power it. A hand crank burning laser. Sadly, not only were they quite expensive, he quickly closed his doors after getting all sorts of "inquiries" from government agents. Since they'd just had this slew of blinded pilot reports from what may have been 5 mW greens, the internet sale of 500mW ones had them "concerned". __________________ I thought what I'd do was I'd pretend I was one of those deaf-mutes.

22nd October 2005, 06:35 AM	(permalink)
williB	Of course , thats the first thing i did too ( took it apart).. then i let it run down ( by leaving it on ), surprizingly it took all night to to run down initially.. your right that once it is run down ,and after a short crank , it only stays really bright for a few mins. but you can just crank it up again.. Anyway i want to use the crank and gears for my new generator , i think it will work..

22nd October 2005, 01:59 PM	(permalink)
audioguru	Your arm will fall off from cranking that thingy. :lol: __________________ Uncle $crooge

22nd October 2005, 02:43 PM	(permalink)
panic mode	maybe it's some sort of fitness equipment :-D 139/12)(39/12)(40/12)*(43/16)=1:94.62239583