I know that the board is toast, but has anyone had the coil start buzzing? Thinking that maybe allowing it hit 6v a few times by only using a 220 ohm resistor might have pushed it...
EverCool Variable Voltage Mod
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100uf 16v tantalum caps.
Been flaking out on me since last night. Thought it was the switch cuz it was so random, but it's looking like the board now. Gonna throw another one in tonight and see how it goes. Been running LR 510 @ only about 3.5 so won't even come close to pushing it. Juice was burning WAY too fast @ higher. Thought I'd like 4-ish cuz an 18650 fresh off the charger is heaven, but I guess at the sustained voltage it was too much. Popped a few that way too.
Quick question, I cant find a 200 ohm pot. I have my TI chip and don want to wait to order one. Sooooo I know pot.'s are just give variable resistance, so could i use a 1K ohm pot? I am assuming it would be fine, i would just have a pretty small safe range adjustment, am I right????? Thanks
Try here: 200 ohm pot items - Get great deals on Business Industrial, Electronics items on eBay.com!
Dozens to choose from... 17th one down is where I bought some... $4.00 for 5 pots... in about 3-4 days... good deal!!
otherwise yes it could work but adj would be like witin a couple mm range only
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1k pot will give you a out put voltage of about 5.5 to 1.8 volts. It would all be safe , although the lower voltages would not be very vape friendly.
If you put a 250 ohm 1/8W resistor in parallel with the 1k ohm pot you would get a full range from 0 to 200 ohms. Deja Vu?
1K will work. So will a 500. Worst case is that you will just be able set the voltage lower than 3.7.
My board (08060w) sizzled (could've been the caps too, basically the sound of something arcing), i took everything apart, reconnected the chip properly (i knew it wasnt making good contacts, but didnt much care), when i put everything backtogether the sizzling is gone.
also, im using a flat220 resistor so im at ~6V.
also, im using a flat220 resistor so im at ~6V.
Voltage drop off?
Been looking at voltage under load (2 ohm 2 watt resistor) and the voltage drops FAST when keeping power to the circuit. Don't notice any issue when vaping at all so it kinda surprised me. Set voltage at 5.3 with no load and after maybe 6-7 seconds the voltage is down to 3 and change.
Anyone else seeing this? Tried it with 2 separate circuits with the same results.
Been looking at voltage under load (2 ohm 2 watt resistor) and the voltage drops FAST when keeping power to the circuit. Don't notice any issue when vaping at all so it kinda surprised me. Set voltage at 5.3 with no load and after maybe 6-7 seconds the voltage is down to 3 and change.
Anyone else seeing this? Tried it with 2 separate circuits with the same results.
I hardly get any drop under load maybe 1 100th of a volt. If i set my voltage to 4.25 it will drop to 4.24 underload. I also dont get any kind of drop when not under load. If i set it to 5.3 volts it stays there. My test circuit is set up always on right now been @ 4.75 volts for a few days now.
Strange. Doubt if it's my caps. 100uf tantalum 16v. Under rated resistors/pot maybe? I've seen most using that little blue pot as well with no mention of this. With no load, I get no drop either....at all.
More then likely your over rated on the resistor for the pot. Data sheet calls for a .05 watt 1% resistor. Thats 1/20th of a watt. I couldnt find any rated that low that were big enough that i could see them with out a microscope. I did find some 1/10th of a watt in smd 0805 package that i went with. I really doubt the resistor is the problem but you really want to get one under what the trimmer is rated at so your not putting more watts threw the trimmer then it can handle. What kinda amps is it drawing while not under load? I would do a amp test if you can.
Yeah, I'll setup an amp test tomorrow.
Just re-tested with a "real" load (2.2ohm carto) and there was NO drop at all.
Meh...too late to start my brain going on this one....will pick it up again tomorrow.
ETA - resistor is 1/4 watt, pot is 1/2 watt
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That's an awfully low wattage for a stable resistance at the current involved over any length of time. For extended periods I would try a 15 - 30 watt range for your load. That should give you the stability you're looking for.
Yeah, 2W was the best I had around. Dunno what happened to some of the 10W that I was using at one point. That may be it then. Thanks.
MidnighToker I can't remember what ohm values they were but years ago I remember getting some pretty high wattage low resistance power resistors at the local auto parts store. I think.... one was for an ignition system and the other was for .... crud... I can't remember. Well, if you happen to be near an auto parts store it might be worth a shot.
For now I'll just use a carto 
If I get a chance, I'll stop by AutoZone and see what they have.
If I get a chance, I'll stop by AutoZone and see what they have.
for me it was always a loose connection, Usually on the ground leg. :>)
I got the chip and I am trying to test things before hand. I picked up a Volume control pot just for ease of use. So far I have not had any success with it unless it is full on. Any suggestions?
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