Endless Sphere

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...

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...

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 ...

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

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...

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 ...

FOC = Farnell Order Code (part number)

I think you mean element 14.

http://au.element14.com

At least it is in Australia.

Amanda

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

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 ...

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...

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 ...

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...

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

Amanda

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...

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.

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

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...

PM sent.

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...

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...

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...

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...

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...

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.

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