rhd
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I actually totally agree with Jerry too Anyone who I've talked to about this driver should be able to attest to the fact that I've been very conservative about pushing, promoting, or making any claims about it. It blows my mind that the design has been out there for almost 4 months and there have been over 750 posts about it in this thread alone, yet nobody besides myself (with my poor-man's $100 DSD Nano "scope"), has scoped it.
Ben and I did a lot of testing and revision of this driver, as much as the two of us could. But that doesn't mean it's enough. I don't believe there's a problem with the design. I've run both diodes (the PL450 and 12x diodes) on the same schematic (not the exact same PCB) without any indication of trouble. So for me, I'm skeptical of the claims that Ryan and a few others have put forward; not because I think "there couldn't possibly be a problem with the design", but because their experience runs counter to my own experience.
That said, a thought has just popped into my mind:
I'll preface by saying that without the schematic in front of me right now, it's really difficult for me to visualize whether I'm shooting completely into left field or not with this theory.
I've been trying to think of things that I do when building with these drivers that others might not, or anything that would make my use of the Open Driver different that of the members who've had trouble. The obvious differences have already been mentioned (I don't use the mosfet, I used 22uF caps, etc)
But one of the things I always do before attaching a diode to any driver, is short all of the capacitors individually. I used to discharge caps simply shorting the diode's +/- pads on the driver. Then at some stage, not with this driver, but with some other driver, I gave myself the impression that I really ought to start shorting each capacitor individually. It's a habit that has stuck. I use a small piece of solder to bridge both contacts on each capacitor individually.
From memory (I don't have the Open/Ben Boost schematic in front of me), if you bridge the LD +/- pads on the driver, it should short the output capacitor and the LD +/- capacitor (the other "output capacitor"). That's two of three taken care of. But I'm wondering if it might not be that case that shorting the LD +/- pads when the driver just passively sitting there, doesn't actually short the C1 input cap. Again, someone with the schematic in front of them should think that one through, as well as think through whether an unshorted C1 input cap would even pose a problem for the LD.
Ben and I did a lot of testing and revision of this driver, as much as the two of us could. But that doesn't mean it's enough. I don't believe there's a problem with the design. I've run both diodes (the PL450 and 12x diodes) on the same schematic (not the exact same PCB) without any indication of trouble. So for me, I'm skeptical of the claims that Ryan and a few others have put forward; not because I think "there couldn't possibly be a problem with the design", but because their experience runs counter to my own experience.
That said, a thought has just popped into my mind:
I'll preface by saying that without the schematic in front of me right now, it's really difficult for me to visualize whether I'm shooting completely into left field or not with this theory.
I've been trying to think of things that I do when building with these drivers that others might not, or anything that would make my use of the Open Driver different that of the members who've had trouble. The obvious differences have already been mentioned (I don't use the mosfet, I used 22uF caps, etc)
But one of the things I always do before attaching a diode to any driver, is short all of the capacitors individually. I used to discharge caps simply shorting the diode's +/- pads on the driver. Then at some stage, not with this driver, but with some other driver, I gave myself the impression that I really ought to start shorting each capacitor individually. It's a habit that has stuck. I use a small piece of solder to bridge both contacts on each capacitor individually.
From memory (I don't have the Open/Ben Boost schematic in front of me), if you bridge the LD +/- pads on the driver, it should short the output capacitor and the LD +/- capacitor (the other "output capacitor"). That's two of three taken care of. But I'm wondering if it might not be that case that shorting the LD +/- pads when the driver just passively sitting there, doesn't actually short the C1 input cap. Again, someone with the schematic in front of them should think that one through, as well as think through whether an unshorted C1 input cap would even pose a problem for the LD.
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