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Old 11-15-2010, 06:03 AM #1
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Default analoge modulation controller

so im curious if its possible to make a 5v analogue controller from a few batteries, a few zener diodes and a potentiometer to control the voltage. not concerned with the speed of modulation, im only looking to control the output safely.
-Nicholas


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Old 11-19-2010, 02:52 PM #2
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Default Re: analoge modulation controller

Lots more information is needed.

- Control the voltage of what, exactly?
- which laser?
- which driver?
- which batteries?
- what speed do you need?
- control the output in what respect?
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Old 11-20-2010, 02:25 PM #3
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Default Re: analoge modulation controller

Try using this constant current regulator that can be PWM modulated. The output current will never go above what the R2 sets as maximum, and it is "default off" when left floating.
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Old 11-20-2010, 03:46 PM #4
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Default Re: analoge modulation controller

If you just want a "signal injector" for testing driver inputs, use a 9 volt battery, a battery clip, a LM7805 regulator , and a one kilo ohm potentiometer, with linear taper.

All available at radio shack for about 8$.

Steve
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Old 11-25-2010, 07:30 AM #5
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Default Re: analoge modulation controller

lsrfaq: im looking to build just that, a signal injector for dr lavas p3 flexmod.
im guessing the input needs to be cv.
one question about the pot, what is a linear taper?
-Nicholas
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Old 11-25-2010, 09:55 AM #6
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Default Re: analoge modulation controller

^ referred to the rate how the resistence change moving the cursor ..... there are basically 2 classes of potentiometers, linear and logaritmic ..... just ask for a linear potentiometer (and, if on the pot there's printed the value followed from a letter, usually A stand for linear, and B stand for logaritmic, so 1KA means 1 Kiloohm linear)
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Old 12-05-2010, 04:44 AM #7
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Default Re: analoge modulation controller

so i picked up the parts and need some guideance putting it together.
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Old 12-09-2010, 05:11 PM #8
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Default Re: analoge modulation controller

Quote:
Originally Posted by nkgamer1990 View Post
so i picked up the parts and need some guideance putting it together.
http://www.fairchildsemi.com/ds/LM/LM7805.pdf

The 7085 has 3 pins and they are drawn out in the above PDF.

Connect the red lead of the battery clip to Input
connect the black lead of the battery clip to ground.

connect another twp black wires to ground, this is the ground signal to the laser and potentiometer.

connect a wire from output to one outer solder loop on the potentiometer
connect a ground wire to the the other outer solder loop on the potentiometer.

Connect a signal wire to the center loop on the potentiometer, this is your variable signal to the driver.

Run the remaining ground wire to the signal ground input on your driver.

Check to make sure the center wire varies from 0-5V on a meter before hooking it to your drivers analog or TTL input.

Steve
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