I've a couple of boards on the way, so I've been reading up. I intend to power the boards from 12v battery packs (4 x 12v 1,2AH), with the supply regulated. My neighbour is in the security business and is a source an almost un-limited supply of the batteries.
Looking through the build manual it states :
Three of the .1uf capacitors need to be put on the places above the chips marked for them now.
Install the 4.7k ohm resistor in the marked location above the big chip if you are going to use the mosfets for high current.So am I correct that I do not need 4.7k ohm resistor for 12v DC.
Then it states:
"You can see the row of paired rectangles that run across the center of the board just above the location for the 16 transistors. Each pair needs a 3k resistor and a .1 uf capacitor added to them as you can see in the above picture if you are using the transistors for high current operation.
If you are not using them and running the board as a low current constant current driver leave them out. "I leave out the 3k resistors and the .1 uf capacitors for 12v DC ?
Finally this bit confuses me,
"Three of the .1uf capacitors need to be put on the places above the chips marked for them now. Install the 4.7k ohm resistor in the marked location above the big chip if you are going to use the mosfets for high current.
If on the other hand you plan to jumper the mosfets where the ovals marks are and leave them off for constant current drive up to 100ma per channel. Then you need to choose a resistor to match the current limit you need and place it here. The correct value for the current needed can be located in the datasheet for the TLC5940NT chip.
Common currents are:
20 ma - Use 1.91k ohm such as Mouser pn# 660-MF1/4DCT52R1911F.
100 ma - Use 380 ohm such as Mouser pn# 660-MF1/4LCT52R391J.
Then install the 120 ohm resistor at the top of the board’s center where it is marked."
I've left out the 4.7k ohm resistor, I want to light basic MR16 led 12v 1w spots or basic single colour led strings. So I'm assuming I'll be leaving off the moffets ? and need to jumper, I know the leds are 20ma, but not sure on the spots, if I go for 100ma can I still use the connections for 20ma strings? my instinct tells me yes, but going to need to put a resistor somewhere in the string to make up the difference. (Electronics is totally new to me, so I've got my trainer wheels on)
Jumper the moffets where the oval marks are? I see three oval marks around the capacitors above the chips, how do I jumper these?
Ian
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