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I've mentioned this before, but if you want to know more precisely what a switch can handle in terms of amperage, you can measure its voltage drop with a known current. Divide the drop by current to get resistance. Alternately, you can use a milli-Ohm meter. Use current squared times resistance with power set to a half Watt then solve for current. Probably anything up to a half Watt is going to be okay, maybe up to a Watt if it's a big switch. That's provided you're not exceeding the switches DC power rating in terms of Volts times Amps.
I can also tell you that switching an8-amp landing light with a 4-amp "lamp" rated switch is notan automatic formula for welding. The 200% "overload" willindeed reduce the life of the switch. However, let us supposethe switch was originally rated for 10,000 cycles (a lowestimate) and the reduction was to 10% of rated life(alsovery low)
Just because the numbers stamped onthe side of the switch don't mention a DC capability doesn'tmean that the switch doesn't have one. Manufacturers areunable to put ALL of the information from the chart onto theside of every product, the lettering would be too small toread!The article also alluded to a 3X increase in the price ofswitches to get "DC rated" devices
Ok first I want to thank you all for the wealth of knowledge that you put out here. Without this I don't know that I could have built my okr mod, it would have taken much much longer to figure it out. I am a plumber by trade and water and electricity don't mix. I used mamu's diagram minus the reverse polarity protection as I am using 7.4 lipo packs. Only one way to plug them in so no big threat there. I installed everything in a temporary box for batt life testing and all before I finish my box.
The OKR requires a 200 ohm pot. Using a value higher than that w/ a parallel resistor will wreck havoc on linearity. Adjustment is a nightmare.See: http://breaktru.com/smf/index.php/topic,244.50.htmland: http://breaktru.com/smf/index.php/topic,1015.msg16441.html#msg16441
Hi everyone first time poster here. I have a couple of the 3 wire led volt meters how would I wire them to show how many volts I am using. thanks in advance and thank you to everyone one here for all the great info.Just connect the black wire to common ground and the other two to the positive of what your measuring. The red wire is for powering the led metter and the white wire is for measuring the volts. You could even just connect the white wire to what your measuring and the other two to power and ground. Either would work.
Yeh saw those, but thought you used it anyway? Thank you for the reply.
Thanks Break, I put it on the BB and its doing the same thing as it was on the PCB. I get like .01V or 5 mV on 200m scale out of Pin 4 with or without Resistor or Resistor/Pot combo. Id say its prob toast right? ThanksStevo
can I use a three 18650 setup to power the chip?
Yes, but omit the zener and the P-FET as they are not needed and replace the batts with the DC connector.
The 1500uF that is shown in your diagram is an output capacitor for the D12S05020. It has nothing to do with passthru or the OKR-T/6.If you would like to add a capacitor for your OKR-T/6, a 22uF 10v or 16v can be added to the input and not the output like your schematic shows.Personally, I don't use caps on my OKR.
Hello all. I'm new to modding and have been reading through this tread for a few weeks. I got my first okr mod up and running after tearing it down a couple times. It's only firing a 6 volts with the trim pot all the way up. I checked everything over and over and finally looked at the specks for the pot. 200k! Damn. If I turn it down even a smidge voltage out drops to .59 ish. I have a 200 ohm pot comming. Hopefully the right pot will get this working right.
Yup, you need a 200 ohm pot. Turning it up to 6V is zeroing out the pot with only the fixed resistor in play.Dialing down the pot puts to much resistance in the circuit with the 200K pot.And... welcome to posting. Don't be shy, we welcome your posts.
Awesome! It'll be hot vapes till Monday then. I'll post a pick when I'm back at the destktop.
Just wanted to show some Pics of boxes I wouldn't have been able to complete if it wasn't for this wonderful site.