Blue modulation acting up

**drlava** · 09-30-2008, 17:31

Well if your DSP is producing 0V during those blanking pulses, then your laser driver needs internal adjustment. Hopefully CNI will get back to you in time.
If they don't let me know there is one other option

**Carl B** · 10-01-2008, 08:43

Dr Laser

What make of laser are you using? I have a 300mW green laserwave that did something like what your blue is doing. I bought the laser from Stanwax. He advised me to connect the blanking input ground to the 5v power input ground as these are not connected to a common ground track on the control PCB. As soon as I did this the lines vanished.

Carl

**Dr Laser** · 10-01-2008, 20:01

Originally Posted by Carl B

Dr Laser

What make of laser are you using? I have a 300mW green laserwave that did something like what your blue is doing. I bought the laser from Stanwax. He advised me to connect the blanking input ground to the 5v power input ground as these are not connected to a common ground track on the control PCB. As soon as I did this the lines vanished.

Carl

Hmmm I'm out testing an idea.

)

**dave** · 10-01-2008, 20:40

Check your PM's.. And use the info at your own risk!!

**Dr Laser** · 10-08-2008, 16:15

FIXED! Thanx to Starburst, Dave and CNI!

**drlava** · 10-08-2008, 17:10

So, apparently the diode controller had drifting setpoints or... your crystals got more efficient at low power over time!

**Dr Laser** · 10-08-2008, 17:56

Low threshold drifted. After adjusting it everything went back to normal. Finally I can design some October 31s shows.

**dave** · 10-08-2008, 20:48

Good work Doc

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