RC Tank Warfare community hobby forum

Now I will say that I don't use resistors with my HL board as they are supposed to be regulated for the LED voltages. I don't recall seeing any resistors on the Taigen board installs, but those are removed pretty much right after I buy them. I've primarily needed resistors with my Open Panzer TCB boards as they deliver full board voltage to the LED slots. I smoked a bunch of LEDs on my HL ZTZ-99. I guess I should've read the documentation before wiring them in...

The resistor value can be easily worked out from
V=IR
Volts = Current (amps) x Resistance (ohms).

With a 7.4 Volt battery
if you want 2 V across your diode with a current of 25mA, 0.025A This will depend on the spec of the diode
then as the diode and resistor are in series, calculate the voltage across the resistor thus:
Battery voltage - voltage across diode.
so
7.4 - 2 = 5.4v

Then the resistance, because you want 25mA, 0.025A is

5.4 = 0.025 x resistor

rearranging, divide both sides by 0.025
5.4/0.025 = resistor = 216 Ohms.

216Ohms is a nonstandard value, so round up to the nearest, 220Ohms.

Hope I'm not teaching anyone to suck eggs...

flyingbogey wrote:Hope I'm not teaching anyone to suck eggs...

Egg sucking is good
Due to the various levels of knowledge of our members, it is always best to have as much useful information as possible within a subject.
Also, for some members, its been a long time since they left school, and therefore easy to forget things they haven't needed to remember.
To conclude, if you notice your known relevant information hasn't been mentioned by anyone else, never hold back from sharing, no matter how obvious it seems to you.

I wonder then if a section, within the electronics board, for such gems would be a handy resource?

flyingbogey wrote:I wonder then if a section, within the electronics board, for such gems would be a handy resource?

I guess it would. Just needs someone knowledgeable who's willing to spend the time writing it all out in a new thread titled appropriately.
Then one of us in the forum team can make it a permanent sticky.

Ah yes time.. LOl.
I will try and scribble something. Working nights soon so that will give me something to do.

flyingbogey wrote:Ah yes time.. LOl.
I will try and scribble something. Working nights soon so that will give me something to do.

The hardest part would be writing it for anyone to understand, what may seem obvious isn't always so.
Well, if you do undertake this task, it will no doubt be very appreciated
We do have a few nuggets of electronics information scattered around the forum, it would be excellent to have such knowledge in one place and not lost pages down through time.

Yes, this is a waggish comment, but still with sincere respect for you electronics wizards.

"The hardest part would be writing it for anyone to understand."

SOG, you got that right! I encountered the term MOSFET today. Curious as always, I found https://www.youtube.com/watch?v=Bfvyj88Hs_o.