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Hello Breaktru, you have very very nice mods here!I just wanted to ask about this mod, that have you measured current that is drawn from the battery? I thought that trustfire flames have a current limit at 1.5C, which on 900mAh batteries would give us max. continuous current of 1.35A? And when it is booster, it should pull more from battery than that 2.4 amps which goes to atty right? Is there something I'm missing? Great mod, it inspired me to build my own booste rmod, in the past i've only made step-down mods. I'm just confused how much current can those batteries give.If you don't understand something, just ask. I'm not sure if that text is clear, since my mother language isn't English...
Hi L18, Welcome to the forum.Thank you, glad I have inspired you. Yes if you do the math for "C" ratings, a 900mah should provide 1.35A. But............ if you do actual testing, it is much higher.After reading your post, you inspired me, to test a real live situation.Now this is not gospel, this is my test. You may get different results depending on your battery. As Craig pointed out once, no two batteries are a like. At least I think that's what he said. Here goes:14500 Trustfire Black & Red, 900mah - (4.03v)Using a 04050c set at 3.79v w/ a 2.0 ohm atty measures 2.96 amps at the battery input to regulator.AW IMR 14500 - 600mah (4.16v)Same setup as the Trustfire measures 2.15 amps at battery input to reg.It looks like the Trustfire did better than the AW IMR Low Drain.P.S.You English is very good.
Yes, I realized that. But almost 3 amps from the battery is very good in my opinion, when we are talking about 14500 batteries.
Hi. Please where can I find the table for what resistors to fit for desired voltage output ranges. Thanks.
Thanks for that. I'm going to give it a go with 2 x 18650's in parallel for a longer lasting smile.
I know nothing about electronic gizmos but can look at a schematic and solder. An explanation and schematic would help. Now if you have an MGB needing tuned up I can understand that. Now you know. I am a mechanic.
Here's my finished 4050C. goes from 3.8v to 6.3v. huhuhuCredit goes to breaktru for his beautiful schematics and guide!
I have also made this mod with the 0405c booster and 2 x18650 so 4.2 off the charger voltage range 3.94-5.4, batteries are 3200 ultrafire. but as soon as i put an atty on it reduces the max output to 4.2v with a 2 ohm atty on and 4.4v with a 1.5ohm dual coil atty.......wierd. I am going to dismantle tomorrow as i suspect the output capacitor may be failing.Any ideas to throw in the hat would be great....... Let you know what i find after replacing output cap....if i can take it apart without breaking anything else cheersStyl3r
My soldering is not the best for sure, will look at that. You posted about different resistors between pins 3 and 4 how does that work the higher the resistance between 3-4 gives higher yield have you a list of what resistors give certain outputi.e20k 5.4 max10k ?15k ?Cheers Dave, off to bed it's 01:25 am here and i am knackered.Kevin aka Styl3r
took the unit apart and tested the 04050c with just positive and negative pins 1 &2 and tested at pin 4 and get 5v but as soon as i attach a 2 ohm load drops to 3.8v is this because there is no capacors on input and output or is the module duff?? Have some new low esr capacitors on order so will breadboard when they arrive and test again.CheersStyl3r
Who do you get your Ti modules from and how much do you pay for them?On my sample order from Ti it says prices areptn04050c @ $10ptr08100wvd @ $8but every stockist i have seen, they are pricedptn04050c @ $20ptr08100wvd @ $16
The sample programs chip makers make available are really intended for OEM manufacturers that build products resulting in volume sales. It's actually an abuse of the system to acquire them for personal use.Not that I'm trying to come off like the sample police or anything, but, it does affect everyone. When people abuse the program, makers stop stop sending samples completely.There have been people that obtain samples then turn around and sell them on eBay. Microchip recently suspended their sample system because of that. Though, what they usually do is shut it down for a few months then start it back up.My feeling is that it's fine to order a few of something here and there for personal use, but don't make a nuisance of yourself. Keep it the sample ordering very moderate. If you get to the point where you are not allowed any more samples, that's too much.
just ordered from Farnell uk 08100w great price as well £11.64 and the ptn04050cad for £13.93 and i am glad i did as i think i have realised why my last test unit did not perform as i expected. Let me explain the sample i had was the ptn0405caz and that one only has an output of 6w as apposed to the 04050cad which is 12w. So thats why when a 2 ohm load was put on the voltage lowered. I thought they were all the same output, i think Dave you were under that impression as well as stated in an earlier post. Sweet i am so chuffed i ordered from farnell it shows each module with a brief description and it's right there...happy days. I have spent days trying to sort this problem out so calculated it 5.5v x 6w = 0.9090 deffenatly not enough for a 2 ohm load. I've changed capacitor, resistors, several times thought it could be my soldering technique...it's always the simple things we overlook.thanks to all for all the help in this, if nothing else we have certantly opened our eyes to so many different aspects of electronics on this journey.cheersKev aka Styl3r