My First Pulse Width Modulator Mod
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IMO the board is the hard part. There are a couple of tricks to doing the soldering that I use. I tin the board pads first and then just lay the component on it and "reflow" the solder with a quick touch of the iron. It may be easier with solder paste but I haven't tried it yet. I may just buy some to see how it goes.
I flipped the pot around that will give you a .100 clearance from the end of the board i slapped a green line on it. Nor sure what you mean about the fet. If you can download this image and load it up in paint of something and show me where it needs to be.
Anywhere along this edge.
If it's too much of a re-design I can find a way to keep the wire away from the POT.
If it's too much of a re-design I can find a way to keep the wire away from the POT.
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Anywhere along this edge.
If it's too much of a re-design I can find a way to keep the wire away from the POT.
Shouldn't be a problem going to have to rework it a bit anyways the diode and resistor are going to be hitting the pot now. going to have to go with that smaller diode the 0603 to make things easyer. Is the pot ok or do you need more clearance ?? I might have enough room to bring it back another .025 to .050 thousandths of a inch.
Here is a quick rework not polished yet. I could move the pot to the green line if needed. Let me know what you think bstedh
You can replace the Via with the negative wire hole at the top left of the 555. The more the wire holes are towards the center the better, this will give room for the bracing material that will hold the board in place. This would allow the fet to slide more to the center also. I learned this today trying to put new wires on the factory board. Which I messed up. I think too much heat =[
Also sliding the diode up by the resistor so that the pads make an upside down L would allow the POT to move in a little more as the resistor should clear the POT wheel because of the round shape. Unless it would throw off the switch side of the board. This would also allow the fet output to move up between the POT leads, stacked like bowling pins...
Would the cut off leftovers from the POT leads work to fill the via's?
What is your opinion on the LED? Should we put two in, one each side of the switch, to evenly illuminate the button or do you think one would sufice? I guess as a prototype it's not overly important however.
Need to find space to put your sig also =]
Not sure if i under stood you correctly but here is what i changed. For the led i think i would go with a tact switch with a built in LED , they are taller i believe but it might work out for the better.
Edit: Or maybe something more like this , not sure what edge your going to be clamping it on ?
Edit: Or maybe something more like this , not sure what edge your going to be clamping it on ?
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I think that will work good.Not sure if i under stood you correctly but here is what i changed. For the led i think i would go with a tact switch with a built in LED , they are taller i believe but it might work out for the better.
I just remembered. Did you have issue with the fet on your bread board where we would need to add a pull up resistor? If not I think we are about set.
If you could post a parts list with the ones you changed up I will order parts probably tomorrow.
I am not going to worry about the LED at this point. What we have now will suffice for a prototype.
Yo Da Man!!!
When do you think you will be making a run of boards? Make sure to make a couple for yourself to play with =] This would work good for a drop in for a box mod also, or just about any type of mod. I will PM you my address.
Oh yea, I got my linux drive updated so I will be installing the software and playing with it later this week if I have some time. I would really like to get back into building my own boards.
I decided to get it going as I was setting up Open Vpn for a snmp server at work... Network monitoring is always needing to be tweaked =[ You always find that one metric you didn't think to add to your monitors.
I decided to get it going as I was setting up Open Vpn for a snmp server at work... Network monitoring is always needing to be tweaked =[ You always find that one metric you didn't think to add to your monitors.
I was hoping to etch tomorrow . I have been switching back and forth between this board and mine. I still got a bit of work to do on mine. I got some liquid Tin coming in Wednesday So no sense in getting it done before then. Oh yeah i have some pre tinned wire i use for threw hole vias i will send a piece of it. doesn't take much.
When i bread boarded this circuit i never ran it off a momentary switch so i don't know if there was a latching problem or not. i will see if i can dig up a switch and test it out. I think a 20Mohm resistor would do the trick if there is a problem. Better to have that 0603 pad there then not . For sure cant add one later.
I posted up another image i editied my last post before this one. I am guessing you plan of claming the top and bottom of the board and not the skinny ends?
Cool linux has come a long way in the last 10 years. Let me know if you need any help, there is also a few tutorials on youtube for geda that might be worth watching.
Yeah you can never under estimate the determination of workers to find ways to surf porn at work and then you get at least a 1000 or so scans coming from China IP addresses a day.
Here is what I am envisioning to support the board. The 555 will face into the tube and the switch side pinched against the body. It will also be notched for the POT.
I'm off to bed, gotta work in the AM.. I'll pick this up tomorrow.
Thanks for all the help....
Thanks for all the help....
Just got done slapping a switch on the breadboard. I had no problems with the mosfet staying clamped. I`ll leave that 0603 pad there anyways just in case.
What size tube is that you plan on using wall thickness that is. I think 1/16" might be as big as you can go. 1/8 on both sides would take up 1/4 of the bottom part of the board. When i do the final later i will try and squeeze everything towards the middle more. Almost done with the layout for my board , might just get this thing etched and solder masked tonight. UPS says my mouser order is coming in a day early. So i will be able to tin the board tonight also. Might just break out the camera and take a few pics along the way and post them up in here.
What size tube is that you plan on using wall thickness that is. I think 1/16" might be as big as you can go. 1/8 on both sides would take up 1/4 of the bottom part of the board. When i do the final later i will try and squeeze everything towards the middle more. Almost done with the layout for my board , might just get this thing etched and solder masked tonight. UPS says my mouser order is coming in a day early. So i will be able to tin the board tonight also. Might just break out the camera and take a few pics along the way and post them up in here.
Don't fight it too hard... I can bevel the edges if needed to clear any components. I will probably make the prototypes out of wood dowel so that it is easier to modify.
Awesome news on the switch.
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If you have the space on future board productions you should send one to Asnider and clutchjunkie to play with as their contributions are what go me started down this path =]
Not a problem at all. I might just get 9 of these with the space i have left on the board. Not sure they are going to want to start off with 0603 resistors they going to be tough for a beginner.
Had to go work on a computer so i am behind schedule now. Still might get it done tonight depending on how late i stay up. I will for sure get the revised parts list up in a bit. I will go ahead and pick out A LED for it and calculate a resistor for stacked battery voltage.
Sleep is important but overrated.. You can make an all nighter of it =] "Youuu Caaan Doooooooooo It!"
Sleep is important but overrated.. You can make an all nighter of it =] "Youuu Caaan Doooooooooo It!"
Oh man i am too damn ugly not to get my beauty sleep. But on the serious side i dont sleep all that much these days so there is a good chance I will get it done. That is if i can quit posting in the forums and get back to work.
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