Search found 293 matches

by MrKang
Oct 09 2009 4:37am
Forum: E-Bike General Discussion
Topic: Where exsists a dependable charger?
Replies: 32
Views: 2333

Re: Where exsists a dependable charger?

I have the same charger and it continues to give 5.23 A to my 48 pack. no problems for now. The milky lookalike LED is a dual color led which indicates the charging or the trickle charge. I ordered like 1.5 months ago a power charger on ebay from Cammy_C http://i256.photobucket.com/albums/hh184/mref...
by MrKang
Oct 09 2009 4:08am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Brushless controller tuning modifications
Replies: 90
Views: 27732

Brushless controller tuning modifications

Yesterday i purchased a 72/1500W contoller on ebay. I think i will experiment on that. http://i256.photobucket.com/albums/hh184/mrefex/72v1.jpg http://i256.photobucket.com/albums/hh184/mrefex/72v2.jpg http://i256.photobucket.com/albums/hh184/mrefex/72v3.jpg are there some limits for the brushless mo...
by MrKang
Oct 07 2009 1:24am
Forum: E-Scooter and Motorcycle General Discussion
Topic: Brushless controller tuning modifications
Replies: 90
Views: 27732

Brushless controller tuning modifications

I am wondering what the possibilities are to tune up your brushless controller. there is: - more voltage - shunt modification - ... is it also possible to increase the PWM clock ? so it makes more rotations ? like a brushed controller ? I have a Electric scooter 48V800W which i upgraded to 15S6P lip...
by MrKang
Sep 15 2009 1:22am
Forum: Battery Technology
Topic: MY LIFEPO4 BATTERY I GOT FROM V-POWER
Replies: 41
Views: 3318

Re: MY LIFEPO4 BATTERY I GOT FROM V-POWER

Hi Subfightr, I recently also received my lifepo4 48v 20Ah from vpower and at first it also had the same problems. Till i found out ( i think ) that the load negative wire was soldered on the wrong place. can you send me a picture of your bms circuit with the bottom unscrewed so we can see the coppe...
by MrKang
Jun 09 2009 9:50am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

controler just arrived this day on my work. I quickly opened it up to discover whats inside the box. And the only things that are different were the FET's. all the other components are identical. (when i'm home i'll upload an image) SOON TO BE PLACED HERE The Fet's are now replaced by 3 pieces each ...
by MrKang
Jun 06 2009 12:56am
Forum: Battery Technology
Topic: LiPo battery care and basic information
Replies: 272
Views: 81622

Re: LiPo battery care and basic information

Hi RWP, I use 12S5P combinations with 10 pcs of 6S Lipo packs 4000mAh I use a 12S balancer. This is how i work when charging. - I turn on the chargers power suply (12V CPU Powerssupply) - Then i put two packs in Serie - I first connect the negative and then the positive lead to the balancer - then y...
by MrKang
Jun 04 2009 9:50am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

Thanks Fetcher for your quick reply, i see that i can order these FET's in Germany on Ebay...i looked at several electronic stores here in holland but they didn't came up with these type of FET's. The downsite is..i have to order for 35 euro's on FET's while i just ordered a new controller which all...
by MrKang
Jun 04 2009 6:26am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

My last modification didn't work well... i replaced the resistor of the oscillator with an variable resistor which probably has destroyed my FET's My first test went well...i just easy turn the throttle and the first thing i noticed was that i didn't hear a zooming noise anymore...it went super smoo...
by MrKang
May 26 2009 3:22am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

next weekend i'm gonna change the resistor into a variable one of 50K with in series a 1K to prevend the oscillator from going nuts. Then i can experiment in PWM frequencies which one is the nicest to drive with. I also install a RF transmitter to switch on my scooter and a circuit with will activat...
by MrKang
May 24 2009 3:00pm
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

This weekend i modified my controller with a higher PWM frequency. As you can see in the pictures, the controller use a TL494 with an oscillator of 340 Hz. that's why it sounded so hard and noisy. http://i256.photobucket.com/albums/hh184/mrefex/MrKang%20E-Scooter/IMG_3636.jpg http://i256.photobucket...
by MrKang
May 15 2009 12:42am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

I'm still waiting for the USB oscilloscope...i hope it arrives soon so then i can measure and experiment with the PWM frequency.
by MrKang
May 07 2009 9:29am
Forum: Battery Technology
Topic: LiPo battery care and basic information
Replies: 272
Views: 81622

Re: LiPo battery care and basic information

*TIP For people who want to use LiPo and want to buy a lipo charger/balancer which works on a 12..24 V DC Input. Use a computer ATX Power Supply instead of a expensive 30A 13.8 Lab Power Supply. Just open the CPU PSU..desolder all wires except the green one. Connect your negative and positive leads ...
by MrKang
May 07 2009 8:22am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

First i'm gonna try to modify the china controller to a higher PWM frequency...if the noise has minimized than it's okay...if i still have that irritating noise than i will try another controller maybe from another brand. any sugestions for a 36V/48V 800W controller ?
by MrKang
May 07 2009 5:39am
Forum: Polls & Surveys
Topic: What chemistry do you use? (Ver. 2)
Replies: 29
Views: 26943

Re: What chemistry do you use? (Ver. 2)

I use all LiPo batteries 22.2V 4000mAh 15C and 7.4V 4000mAh 15C My first pack excists of 5 parallel packs which are configured out of 22.2 and 3 7.4 in serie I just ordered some new 22.2V because of the space. instead of 3 x 7.4 which also is 22.2 Here is a photo of the chage section. It consists of...
by MrKang
May 07 2009 1:37am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

Yup! Icecube57, that's exactly the same noise.. Here are 2 video's for comparison. 1st one is the first testrun i did with my old controller and 2 packs of 22.2V Lipo parallel connected. C67flX2M1_k 2nd test is after i modded it with a 36V china controller and 5P 44.4V Lipo pack. You can here the di...
by MrKang
May 06 2009 9:53am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

Good question... first here is my original setup with my old controller and 750W Bosch motor. http://i256.photobucket.com/albums/hh184/mrefex/MrKang%20E-Scooter/IMAG0039.jpg It had 4x 12V 12Ah packs on it which provided me 24V on 24Ah. My first upgrade was to buy 4 new accu packs cause the old ones ...
by MrKang
May 06 2009 3:05am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

Re: How To tune up the PWM frequency

Thanks for your reply fetcher.

Probably this week i will get a USB Scope to connect it to my notebook. Then i will make some pictures from the controller with my measurments. I soon will update my results.
by MrKang
May 05 2009 6:58am
Forum: Stand-up E-scooters and E-skateboards
Topic: How To tune up the PWM frequency
Replies: 59
Views: 15137

How To tune up the PWM frequency

Hi i'm new here and i read various threads about controllers and modifications. I have a YC43 controller from Ebay and its similar as the YK42-3 controller. Now i read that someone modified thePWM frequency from 2.6KHz to 8 or 15 Khz which produces a bit less noise out of the controller and gives it...