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    DVD burners that rock for diodes.

    Gazoo, What were the markings on the 112D and the sony diodes?
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    CO2 laser power supply issue

    RDZombie, How is the performance of the laser tube. I was thinking about getting one of these.
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    CO2 laser power supply issue

    Do you what material the output coupler and resonator are? Are your optics hygroscopic?
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    CO2 laser power supply issue

    I was saying that the capacitance you had is small for filtering 60 Hz. The current limited transformer has a "weird" V vs I curve. It sounds like you are on the fringe with the transformer. Can you try a variac to increase the input voltage to the transformer?
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    CO2 laser power supply issue

    Where did you get your tube? The amount of total capacitance isn't that much for a 60 Hz system. Try lowering the ballast resistance. Try putting the caps on the output of the bridge rectifier - it sounded like you had them at the terminals of the laser.
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    10MW Green in a Surefire

    It looks like the Jaycar unit is using constant optical output circuity using the PD within the LD package. I would be careful when tweaking the circuitry. This 2-transistor regulator has some limitations/stability issues.
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    new leadlight 110 mod!!!

    The 110's have two transistors in series controlling the LD's current. By shorting out the capacitor you have removed one saturation voltage drop from the "lower" transistor and permitted a slightly higher base current to flow through the "upper" transistor providing a lower saturation voltage...
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    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information bootleg2go, My guess is that one 3-pin package is a zener diode, two 3-packages are NPNs, the other two are PNPs. I'm guessing the 5 pin package is a single op amp. Did you see a change with your mod? I think the 10K is in series with the zener and changing...
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    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information Double E, I'm using MicroSim's Pspice version 7.1 for the simulation. PM me your e-mail if you can work with the .cir file. I'm using a current controlled voltage source as the "optical" feedback. The current sense is in series with the LD and the...
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    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information Double E, I have a hand drawn schematic that I have to transfer to something that others to read before I post. I used the evaluation of PSpice for the simulation. The simulation works and optically regulates fine. I have an idea of how to modify the...
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    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information I have a schematic together but the circuit looks "funky". I wouldn't have designed the circuit this way. I've simulated the circuit and it seems that the maximum current to the LD, if the feedback is disconnected, is much lower than the models without the...
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    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information LaserModifier, Nice job! Can you tell where the wiper terminal from the pot connects? Where does the one connection go from the 1k resistor that you removed? The zener diode, to the lower left of the pot, looks like it has a via from its anode. If there is...
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    Leadlight GPL-110 Modifications

    Re: Leadlight GPL-110 Information There are also a few vias on that circuit board. The traces under the IC in the top left are blind. Its probably best to beep out the traces. I have a partial schematic, but there are a couple nodes that are uncertain. Anyone have a broken one that they are...
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    Modify 5mw new model Leadlight

    If anyone has a dead one that they are willing to part with, I'll trace the circuit like I did for the previous models and come up with a simulation. I can't do it completely fom pictures since the circuit board has some blind vias and I really need a meter to beep out some traces. Since some...
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    *Updated* Driverboard Schematic *532mn Leadlight*

    Re: *Updated* Driverboard Schematic *532mn Leadlig dyter, I wasn't sure if the LD was the SLD302V with a PD or somebody elses without a PD but had connections for a PD.
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    *Updated* Driverboard Schematic *532mn Leadlight*

    Re: *Updated* Driverboard Schematic *532mn Leadlig I'm not entirely sure that there was a PD (photo diode) in the laser package. The PD can be used to drive the LD in a constant output power mode.
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    Some MORE Driverboard schematics and more...

    Enigmahack, Thanks again for posting this! The LD current for the case with the pot wiper shorted to the case is really beyond the simulation capability since it is dependent on many thing that I couldn't model. You can see when the pot wiper gets tied to the case, the current is ramped...
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    *Updated* Driverboard Schematic *532mn Leadlight*

    Re: *Updated* Driverboard Schematic *532mn Leadlig Spec, I updated the schematic and sent it to Enigmahack, but I put in the closest typical cap values instead of the exact values you posted. The last letters could be related to production lot number or a date code. I also, sent E. some...
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    *Updated* Driverboard Schematic *532mn Leadlight*

    Re: *Updated* Driverboard Schematic *532mn Leadlig Spec, I forgot to put one capacitor across the LD/PD pair. I have it on my sketch, but didn't type this into the schematic. Nice catch! My IC is ELM 8554BO. I couldn't find a datasheet for it either. The capacitor from the pot wiper to...
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    *Updated* Driverboard Schematic *532mn Leadlight*

    Enigmahack, Thanks for posting this!

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