Help with Lasrerwave module

**Doc** · 03-09-2011, 10:44

Originally Posted by stupidsexyflanders

i have 5.33 volts on both + and - ttl setting. Yes from the laser driver/ Doc what is the other switch for and which setting should it be on as it also has some influence on things

The other switch selects analogue or TTL operation.

**stupidsexyflanders** · 03-09-2011, 11:20

Originally Posted by Doc

The other switch selects analogue or TTL operation.

so if i probe the dac ttl output i should get 5 volts ? Is anly a couple of hundred mv .

**stupidsexyflanders** · 03-10-2011, 01:57

Originally Posted by stupidsexyflanders

so if i probe the dac ttl output i should get 5 volts ? Is anly a couple of hundred mv .

ok found the problem. because the module is always outputting 5 volts on the ttl input , the dac was also puttinig out 5 volts i have found two bad caps on the dac modulation circuit. So my software must always be set for negative blanking so i dont get the 5 volt ttl output from the dac.

**Doc** · 03-10-2011, 03:45

Glad you found the problem

**stupidsexyflanders** · 03-10-2011, 06:16

Originally Posted by Doc

Glad you found the problem

Doc , on the other switch which postion is ttl & which is analog ? the markings are not clear. Thanks.

**allthatwhichis** · 03-10-2011, 07:53

Originally Posted by stupidsexyflanders

Doc , on the other switch which postion is ttl & which is analog ? the markings are not clear. Thanks.

I would try each setting to find that out.

**Doc** · 03-10-2011, 09:07

Originally Posted by stupidsexyflanders

Doc , on the other switch which postion is ttl & which is analog ? the markings are not clear. Thanks.

I can't remember, I think it's marked 'AS'.

Flip it over and connect a 1.5v battery to the yellow and white leads and see if you get a dim output (I believe yellow is +ve).

**norty303** · 03-10-2011, 11:20

I think theres a reasonably good description of the switch functions here

http://www.photonlexicon.com/forums/...rwave+switches

**stupidsexyflanders** · 03-11-2011, 07:26

Originally Posted by norty303

I think theres a reasonably good description of the switch functions here

http://www.photonlexicon.com/forums/...rwave+switches

looks lik DAC is cream crackered . Replaced the caps but no joy . The TTL goes straight into the main PIC chip so that must be dud. Bugger . Spoke to Mike at Nu Light and he told me it was likely damaged by the laser module ttl input having a constant output of 5.33 volts. On look out for cheap DAC !

**norty303** · 03-11-2011, 08:26

On look out for cheap DAC

WADR, isn't that where your problems started?

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