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Old 09-18-2013, 08:13 PM #1
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Default how to make analog modulation ?

hey guy
I want to buy this module

RGB 800mW Laser Module White Beam Combined BY638NM 532nm 450NMANALOGO Modulation | eBay

i don't think I known how to make an analog modulation.
I thought I could use 3 1k pots , 3 2.5k resistances in parallel , 3 237ohms resistances and 2 18650 batteries to make a 0 5v variable power supply.
i know I won't go under v1.25 with lm 317.






what is your advice ?



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Old 09-20-2013, 12:41 AM #2
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Default Re: how to make analog modulation ?

Just use a potentiometer set up as a resistive divider, a 10K pot will work.
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Old 09-20-2013, 06:08 PM #3
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Default Re: how to make analog modulation ?

What does that have to do with modulation? Ya gonna twist the wiper on the pot to modulate?
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Old 09-20-2013, 06:34 PM #4
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Default Re: how to make analog modulation ?

So in other words you want a 0-5V adjustable power source?

You could also make a PWM signal with a 555 timer to adjust the power.b
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Old 09-21-2013, 09:00 AM #5
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Default Re: how to make analog modulation ?

Quote:
Originally Posted by ARG View Post
So in other words you want a 0-5V adjustable power source?

You could also make a PWM signal with a 555 timer to adjust the power.b
yes that's it a 0-5V adjustable power source on each color
I found the thread below it shows what I want to do:
Analog modulation with Flexmod P3

I also found this cool RGB LIGHTING CONTROLLER:
Make an RGB controller.
but I don't know how to limit the voltage 0-5v, maybe use 3 7805 regulator
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Old 09-22-2013, 08:17 AM #6
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Default Re: how to make analog modulation ?

The module already is analog modulation, you don't need another driver for it. Just use a potentiometer as a resistive divider like I said.
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Old 09-23-2013, 07:30 AM #7
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Default Re: how to make analog modulation ?

Quote:
Originally Posted by Things View Post
The module already is analog modulation, you don't need another driver for it. Just use a potentiometer as a resistive divider like I said.
I'm understand well I just have to go that





it is simpler than I was thinking, I thought I would use an 0-5v external power source for the modulation

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Old 09-23-2013, 08:05 AM #8
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Default Re: how to make analog modulation ?

Like this image here:



Attach the red wire to 5V, the blue wire to the analog modulation + input, and the black wire to negative, and also the analog modulation negative to negative too. Then you will get 0-5V out of the middle potentiometer pin.
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Old 09-23-2013, 09:39 AM #9
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Default Re: how to make analog modulation ?

Quote:
Originally Posted by Things View Post
Like this image here:



Attach the red wire to 5V, the blue wire to the analog modulation + input, and the black wire to negative, and also the analog modulation negative to negative too. Then you will get 0-5V out of the middle potentiometer pin.

if i understood fine I'll do that:



but I haven't bought the module yet so i don't know where is the 5v
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Old 09-23-2013, 10:11 AM #10
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Default Re: how to make analog modulation ?

You can use a resistive divider to get the 5V. The laser module is 12V input power, so:



Connect Vin to the laser power source (12V), make R1 10Kohms, R2, 6.8Kohms, and then Vout is your 5V for the potentiometers.
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Old 09-23-2013, 10:57 AM #11
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Default Re: how to make analog modulation ?

Quote:
Originally Posted by Things View Post
You can use a resistive divider to get the 5V. The laser module is 12V input power, so:



Connect Vin to the laser power source (12V), make R1 10Kohms, R2, 6.8Kohms, and then Vout is your 5V for the potentiometers.
as members of this forum , i use this module as portable.
I use 2x26650 batteries so I use R1 10Kohms and R2 15Kohms

5.040V= 8,4*15000/10000+15000
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Old 04-29-2014, 10:12 PM #12
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Default Re: how to make analog modulation ?

If that is same as my W800 there are three fan outputs which I believe are 5volt. Only two fans uses so there is a vacant 5v output jack.

Double check...I did not measure but manufacturer says the fans are 5 VDC.
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