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Old 08-07-2013, 05:21 AM #1
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Default what is ttl and is it optional on this driver?

Amazon.com: AixiZ 2 pack red and IR laser diode driver 80-500mA w/TTL: Everything Else

i'm sorta aware of what ttl does, but not really, I want to use this driver to put out a solid beam from my diode because this is my first build, can this do it?


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Old 08-07-2013, 05:26 AM #2
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Default Re: what is ttl and is it optional on this driver?

Transistor Transistor logic. Its a means of turning the driver on and off via an input voltage.

Basically you have to supply the driver with an additional (5V I believe) to turn it on.

There are a few members here that sell drivers that do not have this. If you dont need it and size is a factor than go with something else.
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Old 08-07-2013, 05:32 AM #3
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Default Re: what is ttl and is it optional on this driver?

so if I used a 9v batter to the driver it'll work? space is not an issue, i'm going portable in an altoids tin
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Old 08-07-2013, 05:36 AM #4
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Default Re: what is ttl and is it optional on this driver?

on another note, should I need a heatsink for a 660nm 250mw red laser build?
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Old 08-07-2013, 05:38 AM #5
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Default Re: what is ttl and is it optional on this driver?

You will need an additional 5V along side your power supply to the driver to turn it on.

Yes. With a diode running at 250mW you will need some sort of heatsink.

Also you will need safety glasses rated for 650nm.
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Old 08-07-2013, 05:41 AM #6
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Default Re: what is ttl and is it optional on this driver?

care to explain the first part a little more?
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Old 08-07-2013, 05:49 AM #7
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Default Re: what is ttl and is it optional on this driver?

Basically you need a supply voltage to power the driver to in turn power the diode.

You need another 5V supplied to turn the driver from off to on.

You may get away with supplying the same voltage from the same supply to both the TTL and standard negative positive of the driver.
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Old 08-07-2013, 06:08 AM #8
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Default Re: what is ttl and is it optional on this driver?

thanks mate, i'm going to run power from a 9v to both the ttl and the regular input and try my luck
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Old 08-07-2013, 06:39 AM #9
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Default Re: what is ttl and is it optional on this driver?

You might not need a 5V supply for the TTL input. The few drivers that I have come across already have an internal pull up resistor for the TTL pin so if you leave it open, the driver is turned on. Shorting it to ground turns it off.
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Old 08-07-2013, 12:40 PM #10
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Default Re: what is ttl and is it optional on this driver?

The TTL is an additional feature of the driver, if you don't need it, don't use it, 3 aaas will be enough to power it
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