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Old 12-04-2015, 08:29 AM #1
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Default No longer discussing [Please delete this thread]

I am so sorry for controversial and making someone unhappy. Please delete this thread if needed.


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Old 12-04-2015, 02:45 PM #2
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

Are you going to share which chip you are using?
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Old 12-05-2015, 12:12 AM #3
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

Considering his location, even if revealed it may not be able to be sourced
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Old 12-05-2015, 12:36 AM #4
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

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Are you going to share which chip you are using?
I am so sorry but so far I am not going to make it open source yet.
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Old 12-05-2015, 12:50 AM #5
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Default

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I am so sorry but so far I am not going to make it open source yet.
Wait then why did you post it? Bragging rights?
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Old 12-05-2015, 12:57 AM #6
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

Quote:
Originally Posted by joeybab3 View Post
Wait then why did you post it? Bragging rights?
Hi basic I open this thread asking for suggestion on modding the circuit

Quote:
Originally Posted by LaserFever View Post
As you can see there are two version one is using PMOS as protection mosfet another one is using NMOS. I am not quite sure which one will be better.
Quote:
Originally Posted by LaserFever View Post
Further modification will be adding a input and output cap. I don't know whether they are necessary because the original schematic doesn't have one.
I am so sorry if I misunderstood anything.
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Old 12-05-2015, 01:10 AM #7
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

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Originally Posted by LaserFever View Post
Hi basic I open this thread asking for suggestion on modding the circuit.
Its next to impossible to provide suggestions on modding the circuit without knowing how exactly does the IC function. The information of which can only be sourced by referencing the IC's data sheet. A design only becomes proprietary when the circuit is original.
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Old 12-05-2015, 01:26 AM #8
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

Quote:
Originally Posted by LaserFever View Post
Hi basic I open this thread asking for suggestion on modding the circuit

I am so sorry if I misunderstood anything.
I am assuming both pmos and nmos will work i am not familiar with laser driver but I made myself some guitar pedal with mosfet polarity protection before.

Quote:
Originally Posted by joeybab3 View Post
Wait then why did you post it? Bragging rights?
You are little bit radical on what you said. It doesn't not have to be open source in order to post his own design here right? Not everyone willing to reveal everything especially when they have take effort on finding a suitable IC for their need.
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Old 12-05-2015, 11:12 PM #9
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

Quote:
Originally Posted by LaserFever View Post
Hi basic I open this thread asking for suggestion on modding the circuit
You want advice on the IC, but you won't tell us which IC?

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Last edited by Cyparagon; 12-05-2015 at 11:16 PM.
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Old 12-05-2015, 11:38 PM #10
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

Quote:
Originally Posted by Illuminum3415 View Post
Its next to impossible to provide suggestions on modding the circuit without knowing how exactly does the IC function. The information of which can only be sourced by referencing the IC's data sheet. A design only becomes proprietary when the circuit is original.
No problem I thought the problem I am asking is all about the outer circuit. I will experiment both circuit and reported back. Thanks for your help.
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Old 12-05-2015, 11:40 PM #11
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

Quote:
Originally Posted by Hibro View Post
I am assuming both pmos and nmos will work i am not familiar with laser driver but I made myself some guitar pedal with mosfet polarity protection before.
Definitely helps! I decided to try out both and decide which to go.
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Old 12-06-2015, 12:03 AM #12
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

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Originally Posted by LaserFever View Post
Further modification will be adding a input and output cap. I don't know whether they are necessary because the original schematic doesn't have one.
This chip look like a linear regulator to me (no inductor). I think output cap is not really necessary as linear regulator do not generate EMI like switch regulator do. And since you are using low voltage DC input. Input cap can also be omitted but paralleled 10uf and 0.1uf couple can be added if you wish.
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Old 12-06-2015, 12:18 AM #13
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

I maybe missing something, but I don't see how the regulator can sense the current of the LD. If this is the case, it really isn't a current regulator.
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Old 12-06-2015, 04:07 AM #14
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

Quote:
Originally Posted by LaserFever View Post
I am asking is all about the outer circuit.
That REALLY depends on what the IC is, sir.

"Can this couch fit in my car?"
"How big is your car?"
"That's classified. Just tell me if it'll fit."

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Old 12-06-2015, 01:24 PM #15
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

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Originally Posted by Cyparagon View Post
That REALLY depends on what the IC is, sir.

"Can this couch fit in my car?"
"How big is your car?"
"That's classified. Just tell me if it'll fit."

-4 for playing games and being stubborn

look like you want to reveal the IC so bad. He say he will experiment himself and didn't insist asking for help after people say more info is needed. Why don't respect his decision?

disapproved for neg-reping someone unreasonably

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Good to learn. Don't post interesting discovery before you become famous here (unless you will make it public)

Last edited by Hibro; 12-06-2015 at 01:28 PM.
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Old 12-07-2015, 03:56 AM #16
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Default Re: Designing Super Simple 1.5A Red Laser Drive Run Off 1 Cell ( 2 Components Only )

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Originally Posted by paul1598419 View Post
I maybe missing something, but I don't see how the regulator can sense the current of the LD. If this is the case, it really isn't a current regulator.

Its not a linear driver, its more like a current adjustable power switch, like FPF2125 for example. Kind of like a MOSFET switch that doesn't require its own power supply. I'm a particular fan of the FPF2125 because the current limit blanking time before shutdown is infinite, so I can set any current from 0.15-1.5A and run the load wide open and it will regulate the current for me.

Last edited by Illuminum3415; 12-07-2015 at 03:56 AM.
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