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Old 03-09-2014, 10:15 PM #17
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Default Re: Basic Electronics Questions. AMC7135

I have designed a board in EAGLE. Does this look alright?

The pads on the left side are Bat+ and LD+ (bottom & top respectively)
Pads on the right are Bat- and LD- (bottom and top respectively)



Thanks in advance!
-Matt

^^^ Question above still stands. That design all right? It uses a 0.1uf cap (big rectangle) and the AMC7135 chip.

About the size of a MOH linear driver. Maybe a bit smaller.

The only reason i used a large cap is cause my soldering sucks.

Want to get these ordered so i can order the rest of the parts.


-Matt


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Old 03-10-2014, 12:21 AM #18
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Default Re: Basic Electronics Questions. AMC7135

I liked this driver so much I started a thread on it years ago. Maybe there will be some info in it that will be helpful.

My analysis of the AMC7135 Driver

Those were the days when we were buying DVD drives and harvesting diodes from them...lol
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Old 03-10-2014, 02:55 AM #19
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by Gazoo View Post
I liked this driver so much I started a thread on it years ago. Maybe there will be some info in it that will be helpful.

My analysis of the AMC7135 Driver

Those were the days when we were buying DVD drives and harvesting diodes from them...lol
Cool!!

But it doesn't answer my question.....

-Matt
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Old 03-10-2014, 04:09 AM #20
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by crazyspaz View Post
You realize they are 400mW PULSE diodes right?
CW is like 150mW for them
Everyone here overdrives their diodes at the "pulse" ratings (or even above). Otherwise we'd be using some craptastic recommended figures, even if they lasted longer.

Quote:
Originally Posted by KRNAZNBOY View Post
I have designed a board in EAGLE. Does this look alright?
Dude, nobody wants to look at your PCB masks. Post the schematic.

You said you don't know how to read schematics? Learn to read schematics. Learn to write schematics. It's fundamental. In fact, you shouldn't be doing any board layouts until you've learned how to read, interpret, and write circuit schematics. Hell, even your board should be initially routed by your program from the schematic you design.

And why are you jumping to making a driver board first before testing the whole thing out on a breadboard? You don't even know if your circuit works! Don't ask us if your chip is within tolerances. You should be doing the experiments or gauging it from the datasheet (again, learn how to read schematics). Just because PCB manufacturing is cheaper these days doesn't mean you shouldn't be doing prototyping before you send your masks off to get fabbed.

Get some of those chips and wire them up to a breadboard. If you need heatsinking or can't wire it up properly, get a breakout board for your chip. If you want to know if you can power it with a single cell, do the experiment yourself on the prototype! Don't try to run when you can't even crawl.

Overall, some of your questions above qualify as "stupid questions". Why? Because you haven't done your homework first. If you don't know how to read a schematic, then you should learn that before asking basic schematic questions. If you haven't even prototyped your circuit, don't ask us to look at your PCB masks to check if they're correct. Come on dude. Get real. You shouldn't be expecting us to hand-hold you through basic electronics like this.

Don't make me break out the spoonfeeding picture again!
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Old 03-10-2014, 04:58 AM #21
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by Bionic-Badger View Post
Don't make me break out the spoonfeeding picture again!
NOOOO PLEASE

I will google it tonight.

But, does it look ok? Pretty please?

-Matt
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Old 03-10-2014, 02:21 PM #22
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Default Re: Basic Electronics Questions. AMC7135

If you rotate the chip 180degrees, you'll find that the lines will be much shorter and neater.
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Old 03-10-2014, 05:12 PM #23
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Default Re: Basic Electronics Questions. AMC7135

With suitably short traces and diode leads, does the cap contribute anything worthwhile? I had made a crappy 1xAMC7135 + LOC build a while back, and it died after several months of torture (hooking it up to random batteries, living in a box full of metal parts, you know...)

I had the bare chip soldered between the leads, with a random insulated solid copper wire soldered to tab as a heatsink, and stuffed into an aixiz back-end. Never will know cause of death, but wondering if the capacitor would have helped in my case, or what even that capacitor is meant to do in general. Just about everything has a cap across inputs and outputs.

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Old 03-10-2014, 05:57 PM #24
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by BShanahan14rulz View Post
With suitably short traces and diode leads, does the cap contribute anything worthwhile? I had made a crappy 1xAMC7135 + LOC build a while back, and it died after several months of torture (hooking it up to random batteries, living in a box full of metal parts, you know...)

I had the bare chip soldered between the leads, with a random insulated solid copper wire soldered to tab as a heatsink, and stuffed into an aixiz back-end. Never will know cause of death, but wondering if the capacitor would have helped in my case, or what even that capacitor is meant to do in general. Just about everything has a cap across inputs and outputs.
I think they are meant to absorb starting current spikes/overshoots.

Right?


-Matt
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Old 03-11-2014, 12:50 AM #25
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Default Re: Basic Electronics Questions. AMC7135

[QUOTE=KRNAZNBOY;1284579]NOOOO PLEASE

I will google it tonight.

But, does it look ok? Pretty please?

Bionic-Badger is right. A little homework goes a long way and there are tons of schematics and images ....Google it and learn. Your drawing is confusing. Good luck.

Last edited by Gazoo; 03-11-2014 at 12:54 AM.
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Old 03-11-2014, 12:53 AM #26
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by Gazoo View Post
No. If I am looking correctly you have B- going to Out. Shouldn't it go to ground? Bionic-Badger is right. A little homework goes a long way and there are tons of schematics and images ....Google it and learn. Good luck.
Ummmmmm. No. I hope you are not assuming that the left side is b- and right is b+

It is the opposite, and the only thing B- is going to is through the cap and to the GND tab of the chip....
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Old 03-11-2014, 01:04 AM #27
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Default Re: Basic Electronics Questions. AMC7135

The cap prevents the chip from oscillating which can cause random diode death.


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Old 03-11-2014, 01:04 AM #28
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Default Re: Basic Electronics Questions. AMC7135

Quote:
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Ummmmmm. No. I hope you are not assuming that the left side is b- and right is b+

It is the opposite, and the only thing B- is going to is through the cap and to the GND tab of the chip....
I edited my previous post. My bad but still when I started with the chip, and building lasers for that matter I knew nothing about them. I preferred to learn through trial and error. I gained much experience that way as well as reading this forum and using Google. Of course I asked questions if I got stumped. But I didn't want to be spoon fed. I know you can learn too if you take the time and have some patience.
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Old 03-16-2014, 01:11 AM #29
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Default Re: Basic Electronics Questions. AMC7135

The only caps i found that are decent in price are here:

Invalid Request

Will these work. They are the right capacitance and size, but are rated for 250 volts

I don't know maybe the voltage rating affects how they work?


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Old 03-16-2014, 02:32 AM #30
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Default Re: Basic Electronics Questions. AMC7135

Capacitor voltage rating doesn't affect performance, it simply needs to be larger than the worst case expected voltage seen at the node. Generally a safe margin multiplier is applied to determine the minimum rating suitable.
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Old 03-16-2014, 04:58 AM #31
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Default Re: Basic Electronics Questions. AMC7135

Quote:
Originally Posted by Sigurthr View Post
Capacitor voltage rating doesn't affect performance, it simply needs to be larger than the worst case expected voltage seen at the node. Generally a safe margin multiplier is applied to determine the minimum rating suitable.
Schweet. I will hold off on ordering some PCBs until i test my design on a protoboard or something

Thanks guys
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Old 03-17-2014, 11:05 PM #32
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Default Re: Basic Electronics Questions. AMC7135

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Originally Posted by Sigurthr View Post
The cap prevents the chip from oscillating which can cause random diode death.


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dag, sig, can't rep you, but that makes more sense. So it is the longer leads that could change how it senses the load might make the chip oscillations swing too far. Berry Interesting!
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