Maintain current

[stevo11]

PCB123 is a free download software for layout.



Stevo

[galkaen]

Hi all!
How can I upload a PCB file of ridelong's pwm so you all can use it? I tried attaching it but it didn't worked.

[h2ocommuter]

Hi all!
How can I upload a PCB file of ridelong's pwm so you all can use it? I tried attaching it but it didn't worked.

galkaen,
if you could email it to me I may be able to understand how to assemble this thing.

I don't know where the 49.9 K goes to if the 10 meg goes to the # 5 and #2 pins.

besides that i am just guessing as to the assembly.

dzndlideas@aol.com

[galkaen]

h2ocommuter,

You will need express PCB to open it but i'm working on a .bmp version of the schematic too, and as soon as i learn how to post it; i will. I will send you the file also. Remember; I have not tried this yet! If you find it to work please post it and let us know.

This is the file:

http://www.hhoforums.com/attachment....1&d=1224341956

[stevo11]

Ty for the schematic Galkaen. I can see where the +&- (cell+ and cell-)are going to the cell, I also see where the - is coming into the board (-12vdc). My question is where is the posative coming in?



Stevo

[ridelong]

galkaen,

Nice layout. A few comments.

1 Add "+" to the 12vdc label to make it clear.

2 The 20k near the 12 volt zener is 20 ohm.

3 The .01 ohm 25w is way larger and gets hot so it should be elevated off the board.

4 The power section should be beefed up to handle 30 amps. Place overlapping .300 pads so the power components tie together in a big solder puddle. Do this for +12vdc and Cell+, Cell- and d of the fet, s of the fet and .10 25w, .01 25w and -12vdc

5 If you use the heatsink in the bill of materials, you might add some mounting holes for it.

[galkaen]

Hi ridelong!

Redid the whole thing! Thanks for the advice. Here's the new layout. As for the heatsink holes i will put them in if you give me the specs. I was planning on bending the fet and using a top mounted heatsink or an aluminum case. Thank you again!

Also, stevo11: This is not my schematic. It is Ridelong's work. I only made the PCB Layout. The credit goes to him.

Thanks everybody for making this a great forum!

Galkaen

[resago]

how about something hi-res? at least 4x as big and clear.

[ridelong]

galkaen,

The power section looks nice.

The current sense resistor is .550 inch thick, and the soldering holes are
.080 inch diameter, spaced 1.680 inch.

The heatsink is an AAVID THERMALLOY p/n 531302B02500G. It is Digi Key p/n HS386-nd.

[Atm0spher]

so let me know if you accidently build an extra one. i would buy it from ya you know to help you out. good work guys.... i think. i see all the squiggly and stuff but where do all the components go? just kidding.......... so how do they work?