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Old 07-27-2010, 06:25 PM #1
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Default Cannot get TTL modulation to work on flexmod

Having a bit of trouble getting TTL modulation from the flexmod n2. I applied 5 volts from a regulated ps to the driver and adjusted the bias and gain currents. Using my function generator I set a 0-5v square wave signal and applied it to the mod+ and mod- terminals. I hooked up the output terminals to an oscilloscope and observed that there was no square wave modulation at the output (i used a single regular diode as a test load). The output is just a regular DC signal.

I tried searching for an answer but came up with nothing. Maybe you guys can help.


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Old 07-27-2010, 06:46 PM #2
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Default Re: Cannot get TTL modulation to work on flexmod

i can not directly help but i could recommend you pm or email Dr.Lava

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Old 07-27-2010, 07:33 PM #3
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Default Re: Cannot get TTL modulation to work on flexmod

Quote:
Originally Posted by DLProcessor View Post
Having a bit of trouble getting TTL modulation from the flexmod n2. I applied 5 volts from a regulated ps to the driver and adjusted the bias and gain currents. Using my function generator I set a 0-5v square wave signal and applied it to the mod+ and mod- terminals. I hooked up the output terminals to an oscilloscope and observed that there was no square wave modulation at the output (i used a single regular diode as a test load). The output is just a regular DC signal.

I tried searching for an answer but came up with nothing. Maybe you guys can help.
As I recall, if the driver is not under load, you get plain old DC output matching the input. If I were you I'd try hooking the driver to a load (test load or LD) and then see what you get..
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Old 07-27-2010, 08:27 PM #4
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Default Re: Cannot get TTL modulation to work on flexmod

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Originally Posted by chipdouglas View Post
i can not directly help but i could recommend you pm or email Dr.Lava

michael
I sent this driver to Dr lava because I thought it was broken. I sent him pm's and emails to send it back for several weeks before he finally did. I dont think I can get a response from him quickly.

ElektroFreak, if you reread my post I mentioned that I used a single regular diode as a test load.
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Old 07-27-2010, 08:56 PM #5
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Default Re: Cannot get TTL modulation to work on flexmod

Ahh, so you did. Apologies.
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Old 07-27-2010, 09:09 PM #6
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Default Re: Cannot get TTL modulation to work on flexmod

Was the test load diode forward biased?
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Old 07-27-2010, 10:09 PM #7
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Default Re: Cannot get TTL modulation to work on flexmod

How much voltage are you reading across this "regular" diode? If it's bad or reversed, it isn't providing any load. OOPS -- I guess that's what DrLava just asked...
An old LD gone LED makes a good load.
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Old 07-27-2010, 10:57 PM #8
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Default Re: Cannot get TTL modulation to work on flexmod

I hooked the diode anode to +OUT and cathode to -OUT. That should be forward biased, correct? Im sorry I cannot recall the voltage. Im away from my lab so I cannot check it right now.
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Old 08-03-2010, 01:15 AM #9
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Default Re: Cannot get TTL modulation to work on flexmod

Ok I checked the diode voltage and it was 0.8v. However, this is a 0.6v drop diode I am using. Any suggestions?
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Old 08-03-2010, 01:29 AM #10
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Default Re: Cannot get TTL modulation to work on flexmod

Add more diodes to total the voltage drop you expect for your final laser diode.

i.e. 6 diodes for a blu-ray, 5 for a 445, 4 for a red, or 3 for a IR.
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Old 08-03-2010, 06:43 PM #11
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Default Re: Cannot get TTL modulation to work on flexmod

Ok I used 4 regular diodes as my test load but the driver still won't put out a TTL signal. I get 3.2v at the output but my oscilloscope is not showing a TTL signal. I don't know what I am doing wrong.

It would be nice If someone can make a tutorial on setting TTL modulation on lasers. I've yet to see one anywhere.
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Old 08-05-2010, 05:40 AM #12
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Default Re: Cannot get TTL modulation to work on flexmod

Did you try just applying the signal to Mod+?

I assume you already did the jumper and set the currents as described in the manual.
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Old 08-05-2010, 10:52 AM #13
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Default Re: Cannot get TTL modulation to work on flexmod

Yes, mod+ and mod- are connected to the signal generator and ground respectively and I have a nice blob of solder across the the "high" and mod+ jumpers.
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Old 08-06-2010, 01:28 AM #14
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Default Re: Cannot get TTL modulation to work on flexmod

Is there a 0-5V square wave on the input? Some TTL outputs expect a pull-up resistor, which if needed you will have to put in the circuit yourself. A 1k resistor to V+ to Mod+ will be fine.
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Old 08-06-2010, 02:29 AM #15
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Default Re: Cannot get TTL modulation to work on flexmod

Yes its a 0-5v square wave. Do I put the 1k resistors to mod+ and V+? So I will need two 1k resistors?
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Old 09-10-2010, 02:02 AM #16
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Default Re: Cannot get TTL modulation to work on flexmod

Bump, I really need help with this. I believe i am doing everything right but I cannot get it to work. If someone can make some type of video tutorial i would be very grateful. I am a good visual learner.
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