tgsl power input voltage

[Tibuck19]

hey guys I been looking through the forum, trying to find the max voltage I can apply to the TGSL-EDU (Silverdog's kit), I had put it together a while ago, and got it working nicely thanks to help from Donald, however because winter pushing down my neck, I would like to take it out at least once this year, So I have to design an encloser for it, I want to know, do I make it a 3 or 4 cell 18650? can the power supply handle 15 plus V ?

[homefire]

3 cells nominal 11.1V is fine. Regulators at work for everything. I think 15 would be pushing things. I run three 18650 in most everything 12V and works for me.

[Tibuck19]

3 cells nominal 11.1V is fine. Regulators at work for everything. I think 15 would be pushing things. I run three 18650 in most everything 12V and works for me.

Thanks for your input Homefire, that is pretty much what I have been using for all the other MD I made from geotech, but, seeing how is was my first VLF I don't want to chance it. im looking forward to less nails and bottle cap at least one hunt hahahaha just this MD season im up to 22 pounds of metal junk I pull out of the ground.

[Sean_Goddard]

Look at the regulator datasheets to find the maximum voltage they can handle

[Hyena]

Good question. I use 8 rechargeable betteries, which has 1,35V fully charged and 1,1V discharged, which means that fully charged pack has 10,8V and exhaused pack has 8,8. Problem is that LM7808 has 2V dropout. When bateries get to 10V voltage in TGSL starts to decreasing 2V under bateries. I thought about using just 7 rechargeable batteries, which will have 9,45V fully charged and 7,7 discharged.

Question is: Does TGSL without any regulator withstand 9,45V?


LM7808 has absolute maximum rating 35V, but you would not go for more than 15V because you will rise power dissipation... by P = dU . I

[homefire]

I look at it this way. Going with the extra battery is just a waist of resources. And added weight. If your after longer run times the 18650's have that. 2200 mA last me more then two days of my hunting. I'm good with that. You can charge the dang things a half dozen ways on the go. From your truck. Solar. From Another Battery.

[Tibuck19]

indeed homefire, plus less plastic it take to print out the parts, I was mostly wondering because of something KT had said a while back , More power means more depth, probably meant that for PI detector maybe ? Side note the mmp question on insulating the case I had asked a while back, I used kitchen alum sheet used 3m super 77, glue it to the inside case walls and fitted copper tape to the overlapping joints and grounded to TP10 along to the NEG of the coil it has cut the interference by more then half, not perfect but a lot better then it was.