Help with Lasrerwave module

[stupidsexyflanders]

WADR, isn't that where your problems started?

indeed , does anyone else have a laserwave module they could test to see if they have 5 volts on ttl inpt wires on both positive & negative settings. (with no connection to dac)

[stupidsexyflanders]

indeed , does anyone else have a laserwave module they could test to see if they have 5 volts on ttl inpt wires on both positive & negative settings. (with no connection to dac)

Thing is the Nu Light software & DAC wasnt cheap . I sent it back to Mike who confirmed my fear that the PIC chip is only putting out 0.2 volts ttl. #

So on the look out for DAC and software.

[badger1666]

well i would ask for a refund , very poor design if it does not have any form of protection
on the pic outputs, and cant cope with + or - ttl properly.
how much was it ? do you have a link to it on the net ?
i dont under stand why they would even make a dac that was not ilda compatable.

[stupidsexyflanders]

well i would ask for a refund , very poor design if it does not have any form of protection
on the pic outputs, and cant cope with + or - ttl properly.
how much was it ? do you have a link to it on the net ?
i dont under stand why they would even make a dac that was not ilda compatable.

yes i had a good look at it and there is no protection at all. The ttl pin goes straight to the main PIC chip. Everything works apart from blanking . Cost new was about £500 (no i didnt buy it new)

[White-Light]

Cost new was about £500 (no i didnt buy it new)

You could have had Pangolin FB3-QS for that! Would have been worth the extra by the sounds of it.

Although I'm not an electronics expert, by any means, I fail to see how the laser could be responsible for claimed DAC voltage damage anyway.

Isn't voltage set by the electronics?

I understood voltage was fixed by the resistors in an electronic device and that the only variable was that an appliance can draw the current it needs but at the fixed voltage. So whereas you can burn an appliance out by drawing over current, you shouldn't be able to burn something out by drawing over voltage because you can't actually draw more volts than is available (you can input into something more volts than it wants but you can't draw out more volts than the source (DAC in this case) can supply).

So if it was over voltage on output, surely its the DAC thats been factory set over voltage not the laser as the laser can draw more current but can't draw out of the DAC more than the set voltage. The only way you could damage the DAC by voltage therefore surely would be to connect its input to an over voltage supply but that isn't what is claimed though is it, as isn't the damage to the output stage?

Sounds like an excuse to me for a faulty product that they don't want to replace.

[stupidsexyflanders]

You could have had Pangolin FB3-QS for that! Would have been worth the extra by the sounds of it.

Although I'm not an electronics expert, by any means, I fail to see how the laser could be responsible for claimed DAC voltage damage anyway.

Isn't voltage set by the electronics?

I understood voltage was fixed by the resistors in an electronic device and that the only variable was that an appliance can draw the current it needs but at the fixed voltage. So whereas you can burn an appliance out by drawing over current, you shouldn't be able to burn something out by drawing over voltage because you can't actually draw more volts than is available (you can input into something more volts than it wants but you can't draw out more volts than the source (DAC in this case) can supply).

So if it was over voltage on output, surely its the DAC thats been factory set over voltage not the laser as the laser can draw more current but can't draw out of the DAC more than the set voltage. The only way you could damage the DAC by voltage therefore surely would be to connect its input to an over voltage supply but that isn't what is claimed though is it, as isn't the damage to the output stage?

Sounds like an excuse to me for a faulty product that they don't want to replace.

I just had an email back fro Mike he designed the dac . He says it was damaged by voltage being applied to the ttl output . My laserwave module was also putting out 5 voltson ttl but because the ttl on the DAC has no protection . He want £175 to repair.
No chance .

[stupidsexyflanders]

You could have had Pangolin FB3-QS for that! Would have been worth the extra by the sounds of it.

Although I'm not an electronics expert, by any means, I fail to see how the laser could be responsible for claimed DAC voltage damage anyway.

Isn't voltage set by the electronics?

I understood voltage was fixed by the resistors in an electronic device and that the only variable was that an appliance can draw the current it needs but at the fixed voltage. So whereas you can burn an appliance out by drawing over current, you shouldn't be able to burn something out by drawing over voltage because you can't actually draw more volts than is available (you can input into something more volts than it wants but you can't draw out more volts than the source (DAC in this case) can supply).

So if it was over voltage on output, surely its the DAC thats been factory set over voltage not the laser as the laser can draw more current but can't draw out of the DAC more than the set voltage. The only way you could damage the DAC by voltage therefore surely would be to connect its input to an over voltage supply but that isn't what is claimed though is it, as isn't the damage to the output stage?

Sounds like an excuse to me for a faulty product that they don't want to replace.

I just had an email back fro Mike he designed the dac . He says it was damaged by voltage being applied to the ttl output . My laserwave module was also putting out 5 voltson ttl but because the ttl on the DAC has no protection . He want £175 to repair.
No chance .

The dac still works as does the ttl , its just that it only outputs 0.2 volts. Im thinking if i can use an op amp to bring that up to 5 volts but would the opamp work at the 10khz blanking speed. Any electronics genious out there ?

[White-Light]

Does the laser feed back voltage to the DAC?

I always thought that it was the other way around ie it was the DAC that powered the laser driver (input) in which case if the output is over voltage surely its the DAC thats damaged itself.

Maybe someone with the tech know how can clear this up.

[stupidsexyflanders]

Does the laser feed back voltage to the DAC?

I always thought that it was the other way around ie it was the DAC that powered the laser driver (input) in which case if the output is over voltage surely its the DAC thats damaged itself.

Maybe someone with the tech know how can clear this up.

Yes i though the DAC provides the 5 volts which it did , but for some reason if i measure the ttl wires on the module psu they are always at 5.33 volts regardless of positive or negative setting. Thats with no connection to DAC.