Search found 4073 matches

by Jeremy Harris
Dec 16 2012 5:05am
Forum: Motor Technology
Topic: What company makes HobbyKing outrunner motors?
Replies: 24
Views: 3713

Re: What company makes HobbyKing outrunner motors?

What company makes HobbyKing outrunner motors? Specifically the 63mm sk3 series... (59mm actual can diameter) I need to have them add hall effect sensors to the motor's. It is way to labor intensive to add sensors to lots of motors, like a few hundred. I have done around 10 so far, and it just take...
by Jeremy Harris
Dec 16 2012 4:53am
Forum: E-Bike Technical
Topic: New 6 FET Water Cooled using 200v 230Amp FETS!! :D
Replies: 13
Views: 1331

Re: New 6 FET Water Cooled using 200v 230Amp FETS!! :D

http://i106.photobucket.com/albums/m250/NickF23/104_0496.jpg Don't forget new 250v low ESR and ESL caps. Lots! Pic just to show good position... The gate charge of those fets is very high! At least put some 15ohm resistors parallel to existing gate resistors to minimize switching losses First off, ...
by Jeremy Harris
Dec 16 2012 4:44am
Forum: General Discussion
Topic: Dear America,
Replies: 322
Views: 24890

Re: Dear America,

I'll add my applause to that above for your post, Mike.
by Jeremy Harris
Dec 15 2012 4:32pm
Forum: General Discussion
Topic: Dear America,
Replies: 322
Views: 24890

Re: Dear America,

this is the thing that drives me crazy about what the "war on terror" has done at home for us yanks, if you're trying to tell me that the reason we haven't had any foreign terrorist attacks here since NY is because our government is so good at it you're nuts. spend a lot of time on the streets and ...
by Jeremy Harris
Dec 15 2012 1:10pm
Forum: General Discussion
Topic: I did a gun-control petition
Replies: 113
Views: 4279

Re: I did a gun-control petition

Well I think it would have been a lot more than a few hundred, in the UK before the handgun ban, but since they were a minority then it seems Ok to act against them. it seems to be only ethnic and disable minorities that get protection these days :shock: In 1996, before the handgun ban, there were ...
by Jeremy Harris
Dec 15 2012 12:40pm
Forum: General Discussion
Topic: I did a gun-control petition
Replies: 113
Views: 4279

Re: I did a gun-control petition

There can be no reason for owning a handgun other than to kill people, Nonsense. there is ( or was in the UK) a very big target pistol shooting community. And then ban on handguns has done nothing to reduce the number of deaths caused my the misuse of them. In fact since the ban, there number of sh...
by Jeremy Harris
Dec 15 2012 11:43am
Forum: General Discussion
Topic: I did a gun-control petition
Replies: 113
Views: 4279

Re: I did a gun-control petition

In 2010 there were 8775 deaths by fire arms in the US. In that same year, there were 10228 drunk driving deaths. I don't see many people seriously considering banning Alcohol or automobiles, but thats clearly a larger danger than guns. As an American, I accept the risks that come with our freedoms....
by Jeremy Harris
Dec 15 2012 11:02am
Forum: General Discussion
Topic: Dear America,
Replies: 322
Views: 24890

Re: Dear America,

In Switzerland, they hand their young semi-automatic weapons at the age of what, 18? to be part of the standing militia.. Yet, they have 1/5th-1/15th the murder rate compared to any metro area in the USA, and most murders aren't done with guns. Also, when did the last mass shooting happen in Switze...
by Jeremy Harris
Dec 15 2012 10:01am
Forum: General Discussion
Topic: Dear America,
Replies: 322
Views: 24890

Re: Dear America,

We've discussed the gun crime differences between the US and the rest of the world elsewhere, but it is a fact that Americans murder more people using guns that many (most?) countries that we would consider have a similar standard of living. It's also a fact that since the UK banned handguns 15 year...
by Jeremy Harris
Dec 15 2012 9:18am
Forum: General Discussion
Topic: Dear America,
Replies: 322
Views: 24890

Re: Dear America,

You don't go hunting with handguns or AK-47s. Chris you may need to stand corrected. I shot this video when I went back home a couple of years back. It's an AK. A favourite if your looking for reliability, mud and rain in an automatic in fiordland amongst the helicopter deer cullers. I'll own up to...
by Jeremy Harris
Dec 15 2012 7:43am
Forum: General Discussion
Topic: Dear America,
Replies: 322
Views: 24890

Re: Dear America,

I don't know the facts, other than the media reports, but the BBC news here is reporting that the mass murderer came from a fairly wealthy family. His mother is reputed to have been a teacher at some time, and seems to have been a reasonable parent. The only odd thing in the news reports here (apart...
by Jeremy Harris
Dec 15 2012 6:59am
Forum: General Discussion
Topic: I did a gun-control petition
Replies: 113
Views: 4279

Re: I did a gun-control petition

You might want to go further. Following a similar tragedy here, 16 years ago, in which a man armed with 4 hand guns and 700 rounds of ammo walked around a primary school and killed 16 children who were between 5 and 6 years old and their teacher we passed a law banning handgun ownership. There can b...
by Jeremy Harris
Dec 15 2012 6:48am
Forum: General Discussion
Topic: Dear America,
Replies: 322
Views: 24890

Re: Dear America,

I'm no great supporter of gun laws, despite living in a country where gun ownership is so restricted by law that only very few people legally own guns, but recognise we need them. There are several examples of other countries where gun laws are fairly relaxed and where gun ownership levels are high,...
by Jeremy Harris
Dec 15 2012 6:24am
Forum: General Discussion
Topic: Dear America,
Replies: 322
Views: 24890

Re: Dear America,

I couldn't agree more. Seems a terrifying and deeply tragic misuse of guns, one that I suspect will result in a great deal more concern over gun laws, when the real problem is that a culture of violence has developed, where the value of human life has decreased below the level that many civilised co...
by Jeremy Harris
Dec 15 2012 3:57am
Forum: E-Bike General Discussion
Topic: Poly Battery Blew Up Into Flames Today
Replies: 25
Views: 1470

Re: Poly Battery Blew Up Into Flames Today

My guess is the same as AWs. One or more cells died duringthe prolonged period of storage, perhaps due to teh small discharge from the BMS, perhaps due to the pack not having been charged before storage. Charging is when a defective battery is most likely to go up in flames. In fact I'd say 99% of b...
by Jeremy Harris
Dec 14 2012 1:19pm
Forum: E-Bike General Discussion
Topic: Mobility Bike???
Replies: 20
Views: 1564

Re: Mobility Bike???

I'm a firm believer in making ebikes stealthy, have been from the off. My latest build now has the small Q100 motor in the back, but will shortly switch to having one of the new Tongxin motors in the front. Here's a photo of it with the larger BPM motor in the back, as I originally built it: http://...
by Jeremy Harris
Dec 14 2012 10:54am
Forum: Battery Technology
Topic: Diode in charging circuit
Replies: 7
Views: 781

Re: Diode in charging circuit

take the diode out. why did you decide to leave the charger connected after charging? if you do not want the charger to drain the pack down while leaving it connected to the charger, you need to open the charger and remove the drain down resistor across the output caps. I agree about disconnecting ...
by Jeremy Harris
Dec 14 2012 4:30am
Forum: E-Bike Technical
Topic: type of infineon controller
Replies: 8
Views: 742

Re: type of infineon controller

The battery capacity will only change the range, not the performance, so won't have any effect on the controller or motor. The higher battery voltage will increase the top speed and make the bike feel a fair bit quicker. The controller shouldn't get appreciably warmer on 48V than it does now. The LV...
by Jeremy Harris
Dec 14 2012 2:45am
Forum: E-Bike Technical
Topic: type of infineon controller
Replies: 8
Views: 742

Re: type of infineon controller

It's definitely not an old Infineon controller, neither is it a Xiechang (which are often mislabelled as Infineon controllers). As wesnewell says it should be OK for 48V, but those FETs have a fairly high on resistance of 9.5 mohms so it's going to get warm if the current limit is increased apprecia...
by Jeremy Harris
Dec 13 2012 5:19pm
Forum: E-Bike Technical
Topic: Bafang motor
Replies: 7
Views: 924

Re: Bafang motor

The main advantage of the CST motor, with the cassette, over the BPM motor (the same motor but with a freewheel thread), is that the cassette allows a wider gear range. The tallest gear on a freewheel is 12T, and then only on one type that may not be the best in terms of quality. Most normal freewhe...
by Jeremy Harris
Dec 13 2012 12:13pm
Forum: E-Bike Technical
Topic: Another Lebowski controller
Replies: 38
Views: 4282

Re: Another Lebowski controller

Thanks, that's worth knowing. Good job the IRS2186 chips look to be pin compatible with the NCP5181's and also a good job that I fitted sockets to my board for the gate drivers! I should get the boards finished tonight or tomorrow, so will post an update. The stacked board system seems to have worke...
by Jeremy Harris
Dec 13 2012 12:07pm
Forum: Battery Technology
Topic: awg10 different qualities
Replies: 13
Views: 617

Re: awg10 different qualities

For some purposes I prefer the stuff with the thicker strands. It's not as flexible, which can be a bit of a nuisance if trying to get it into tight spaces, but it does generally seem to be easier to solder. I've often found that the very fine strand stuff takes a fair bit more heat to ensure that s...
by Jeremy Harris
Dec 13 2012 11:49am
Forum: E-Bike Technical
Topic: type of infineon controller
Replies: 8
Views: 742

Re: type of infineon controller

First off, that's definitely not an Infineon controller, as it has a different chip. It maybe a Xiechang, but I've been digging through their website and can't find the details of an EB787 plus I can't see the Xiechang logo on that board (take a look underneath, their logo looks like this: Xiechang....
by Jeremy Harris
Dec 13 2012 11:08am
Forum: E-Bike Technical
Topic: New Keyde rear roller motors
Replies: 40
Views: 8154

Re: New Keyde rear roller motors

I've got one of Justin's sample Tongxin motors on the way to try on my light weight folder. It's a front motor, with Halls, so once t arrives and I have it built in to a wheel I'll update this thread with the way it behaves. The one I have comng is the 230rpm 24V one, so the high speed wind. It'll b...
by Jeremy Harris
Dec 13 2012 11:04am
Forum: E-Bike Technical
Topic: Bafang motor
Replies: 7
Views: 924

Re: Bafang motor

My experience of abusing a Bafang SWXH for the past couple of years has been that it's pretty reliable. Fairly quiet, too. Not earth shattering in terms of performance, but a nice little motor all the same.