Search found 106 matches

by commanda
Jan 22 2013 1:42am
Forum: Food and Drink
Topic: Any Coffee Roasters on the forum?
Replies: 48
Views: 6582

Re: Any Coffee Roasters on the forum?

Guilty as charged. Been roasting for about 18 months. Started with a popcorn popper, quickly upgraded to a Coretto. This a bread maker (has a paddle to stir the beans) and a heat gun for heat input. For those Australians reading this who may be interested in getting into coffee, the place to hang ou...
by commanda
Dec 30 2012 3:18pm
Forum: General Discussion
Topic: Automation coding to mimic Ladder Logic
Replies: 7
Views: 474

Re: Automation coding to mimic Ladder Logic

Interesting debounce method. I think the following line is wrong: if (FS=0){digitalWrite (footswitchD,LOW);} because footswitchD is a boolean variable, not an I/O pin. I believe it should be: if (FS=0){footswitchD = false;} // true & false should be globally defined as part of the Arduino package. Y...
by commanda
Dec 28 2012 3:53pm
Forum: General Discussion
Topic: Automation coding to mimic Ladder Logic
Replies: 7
Views: 474

Re: Automation coding to mimic Ladder Logic

Hardware wise, can I suggest you isolate the physical switches from the CPU pins. A transistor, an opto, all the way up to the plugin Opto-22 modules. Software wise, you need to debounce those switch inputs. The quick & dirty solution is probably just a great big delay at the end of the loop. I'm a ...
by commanda
Dec 21 2012 6:57pm
Forum: Battery Technology
Topic: Cell-Log Mod - Perfectly even drain! - FINISHED!
Replies: 39
Views: 7378

Re: Cell-Log Mod - Perfectly even drain! - FINISHED!

Heath,

I have another question.

Is there any reason why the HVC+ signal from the opto's doesn't connect directly to the gate of the Fet?
Seems to me there are 2 transistors and a number of resistors which are redundant.

Amanda
by commanda
Dec 21 2012 5:35pm
Forum: Battery Technology
Topic: Cell-Log Mod - Perfectly even drain! - FINISHED!
Replies: 39
Views: 7378

Re: Cell-Log Mod - Perfectly even drain! - FINISHED!

What do you guys think of the BVM-8S Cell-Log copy? I will have to leave it going for a bit and see how it drains. I ordered one off ebay for like $14 delivered and so far I think it craps all over the original Cell-log. It comes with a external larger optional speaker for a louder warning beep and...
by commanda
Dec 19 2012 10:05pm
Forum: Battery Technology
Topic: Cell-Log Mod - Perfectly even drain! - FINISHED!
Replies: 39
Views: 7378

Re: Cell-Log Mod - Perfectly even drain! - FINISHED!

Heath, Looking at the schematics, I take it this is a hiccup type charge controller. That is, once a cell charges up & triggers the alarm out on the cell-log, switches off the FET in the negative charge lead, charge current stops, the full cell bleeds down slightly via the TL431, the cell-log drops ...
by commanda
Nov 08 2012 1:44am
Forum: Battery Technology
Topic: Cell-Log Mod - Perfectly even drain! - FINISHED!
Replies: 39
Views: 7378

Re: Cell-Log Mod - Perfectly even drain!

FOC = Farnell Order Code (part number)

I think you mean element 14.

http://au.element14.com

At least it is in Australia.

Amanda
by commanda
Nov 05 2012 4:30am
Forum: Battery Technology
Topic: Cell-Log Mod - Perfectly even drain! - FINISHED!
Replies: 39
Views: 7378

Re: Cell-Log Mod - Perfectly even drain!

Quiescent current (per channel) typically 2mA. 2.8mA worst case across the full temperature range.
8 channels * 2mA = 16mA.

Hours connected to drain 1AH = 1000/16 = 62.5 Hrs = 2.6 days.

And it's not rail-to-rail output. Typically (V+) – 0.8 (800mV).

Amanda
by commanda
May 07 2011 5:31pm
Forum: E-Bike General Discussion
Topic: New Jersey - When is a bike not a bike?
Replies: 73
Views: 7856

Re: New Jersey - When is a bike not a bike?

Here in NSW Australia, those scooters with tacked-on pedals are specifically banned. And, an electric assist push-bike must actually look like a push-bike. As someone who has commuted for the past 4 years on an EVT electric scooter, I'm afraid I have to agree with the authorities on this one. If it ...
by commanda
Apr 25 2011 4:44pm
Forum: Battery Technology
Topic: Switch mode supply mod
Replies: 653
Views: 79690

Re: Switch mode supply mod

canada and unfortunatly the fans seem to be cheapo as i dont even have any spares. i would invest in two better quality fans as i think the unit will blow if the fan dies. (because of thermister mod, changes the thermal protection circuitry?) mike Mike, If you leave the thermistor circuit alone, an...
by commanda
Apr 25 2011 4:38am
Forum: Battery Technology
Topic: Any one got a dead meanwell? I need a fan
Replies: 8
Views: 722

Re: Any one got a dead meanwell? I need a fan

Neil, Got plenty of 80mm fans, and a 40mm, no 60mm. Glad the Q5 mod worked for you. Good point of doing it this way, the thermistor "stage 2" protection still works as designed. If it does overheat (because the fan failed), it drives the Dead Time Control on the TL494 to cut the current by reducing ...
by commanda
Apr 25 2011 4:04am
Forum: Battery Technology
Topic: Any one got a dead meanwell? I need a fan
Replies: 8
Views: 722

Re: Any one got a dead meanwell? I need a fan

Neil, Does my memory serve me correctly, and you're in Australia? If so, Jaycar have a 60mm square x 25 mm deep, 12 volt, 130mA, 20 CFM fan for $19.95 (YX-2505). Of course, donated from junk box for cost of postage is better. If no one else pipes up, I'll look in my junk box tomorrow. You may be luc...
by commanda
Apr 19 2011 7:14am
Forum: Battery Technology
Topic: charging LiFePo4 with solar cells
Replies: 50
Views: 8696

Re: charging LiFePo4 with solar cells

Use panels in sets of 3 in series to charge 36 volts directly.

Amanda
by commanda
Apr 19 2011 2:30am
Forum: Battery Technology
Topic: charging LiFePo4 with solar cells
Replies: 50
Views: 8696

Re: charging LiFePo4 with solar cells

Hello, For my Electric tadpole bike: - 250W minimotor (goldenmotor) - 36V lifepo4 15 aH (pingbattery) I'm looking valuable solar power system for charging the battery during ride. How about 2 pcs 10 w semiflex monocrtystal panel?, I can be upgrade quantitys if needed. Problem is solar power control...
by commanda
Apr 18 2011 2:24am
Forum: E-Bike Technical
Topic: Q: Mtn bike front suspension, max rake?
Replies: 4
Views: 504

Re: Q: Mtn bike front suspension, max rake?

Thank you. Still not sure which way to jump. There's some forks coming up on eBay shortly that I may try. Still contemplating whether to build a springer or not.

Gotta start putting all my thoughts down on paper.

Amanda.
by commanda
Apr 15 2011 8:53pm
Forum: E-Bike Technical
Topic: Q: Mtn bike front suspension, max rake?
Replies: 4
Views: 504

Q: Mtn bike front suspension, max rake?

Just toying with some design ideas here. How far over can I lean mountain bike front suspension forks before they bind up and stop working.
Thinking full suspension chopper/dragster thingy. Obviously, we're talking budget forks, not top $helf.

Amanda
by commanda
Apr 09 2011 9:11pm
Forum: E-Bike Build Threads / Photos & Video
Topic: Chopper with Cyclone kit
Replies: 9
Views: 2329

Re: Chopper with Cyclone kit

Time for an update & some fresh piccies. IMGP1160.JPG IMGP1161.JPG IMGP1162.JPG IMGP1163.JPG IMGP1164.JPG The batteries are now 8s * 20AHr Foxx prismatics which cost me $300.00. And you can't put the motor on top, because the idler will be under tension, and it will bend the shaft. Peak current to t...
by commanda
Apr 04 2011 7:08pm
Forum: Battery Technology
Topic: Reviviing LiFeP04 battery
Replies: 3
Views: 410

Re: Reviviing LiFeP04 battery

PM sent.
by commanda
Apr 04 2011 2:49am
Forum: Battery Technology
Topic: Reviviing LiFeP04 battery
Replies: 3
Views: 410

Re: Reviviing LiFeP04 battery

Partially recharging using a laboratory, or benchtop, power supply would be quite easy. These are the ones with variable voltage & current limit. Typically 0-30 volts & 0-3 amps. A jury-rigged setup could be fashioned using any sort of dc power supply and a resistor. You can access single or multipl...
by commanda
Mar 30 2011 8:49pm
Forum: Battery Technology
Topic: What exactly do I need to leave a pack charging unattended?
Replies: 48
Views: 3416

Re: What exactly do I need to leave a pack charging unattend

Most seem to be charging to about 3.8 or 4v then falling back to something between 3.36 and 3.38 the way they should, but a few that have been hanging around 3.41 or 3.5 for the last week are making me suspicious. Hopefully its just surface charge or something that will bleed off as soon as I apply...
by commanda
Mar 25 2011 8:24pm
Forum: Battery Technology
Topic: What exactly do I need to leave a pack charging unattended?
Replies: 48
Views: 3416

Re: What exactly do I need to leave a pack charging unattend

Indubitably, I went back to the site of your bms, and read the user manual carefully. They talk about a unit with shunting option, but don't give any details. The standard setup connects the charger directly to the batteries. It then switches off the charger when the first cell hits HVC. This will a...
by commanda
Mar 21 2011 9:00pm
Forum: Battery Technology
Topic: What exactly do I need to leave a pack charging unattended?
Replies: 48
Views: 3416

Re: What exactly do I need to leave a pack charging unattend

Njay, Don't use charge equalization I guess there could be a subtle distinction there. Yes, poorly designed/implemented charging/bms can be a serious problem. It is my considered opinion that any charging solution which relies on the voltage out from the charger matching the batteries voltage is ult...
by commanda
Mar 19 2011 1:13am
Forum: Battery Technology
Topic: What exactly do I need to leave a pack charging unattended?
Replies: 48
Views: 3416

Re: What exactly do I need to leave a pack charging unattend

A 40AH TS pack is not cheap. Do it right and use a BMS. And forget the Ghetto Guerrilla straight off the mains idea. Good way to kill yourself. And the rectified and filtered dc voltage is sqrt(2) times the ac rms value. So 120 volts ac is 170 volts dc. (approx). For the record, I've had a 16s x 40A...
by commanda
Mar 07 2011 3:33pm
Forum: Battery Technology
Topic: Problem with meanwell power supply knock off.
Replies: 29
Views: 1382

Re: Problem with meanwell power supply knock off.

If it say's NTC1 next to it, then it is definitely a Thermistor. Temperature dependent resistor. Negative Temperature Co-efficient. Starts off high resistance which limits the inrush current. Current flowing through it causes it to warm up, which lowers the resistance.
by commanda
Mar 07 2011 9:40am
Forum: Battery Technology
Topic: Problem with meanwell power supply knock off.
Replies: 29
Views: 1382

Re: Problem with meanwell power supply knock off.

I'd hazard a guess that was a thermistor. NTC ?
Used to limit the inrush current at switch on. Salvage a replacement from a dead PC power supply.

Amanda