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Post by Casethecorvetteman on Apr 20, 2016 7:29:02 GMT -5
Hi All  Ive got 2 different convergence boards and 2 different focus boards here, both of which the later versions are a bit larger. All 4 of these boards i have here appear to operate perfectly fine, and will soon be rebuilt with new capacitors. Does anyone know what differences there are between them in terms of operation and performance? One thing i would really like to be able to do with the convergence is reduce the step sizes for the fine adjustments, because often there are a couple sections that dont line up dead on perfect, it is either slightly left or one click over makes it slightly right. Vertical adjustment is not really an issue, but horizontally it is. Making the steps around half the size would really make a huge difference to the overall image quality. |
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Post by gjaky on Apr 20, 2016 7:53:10 GMT -5
One thing i would really like to be able to do with the convergence is reduce the step sizes for the fine adjustments, because often there are a couple sections that dont line up dead on perfect, it is either slightly left or one click over makes it slightly right. Vertical adjustment is not really an issue, but horizontally it is. Making the steps around half the size would really make a huge difference to the overall image quality. For starting you can try to solder a 4k7 resistor parallel with each R104, R134, R164 on convergence output board. With these values the gain would be roughly halved, if the range is too small you can try a bigger resistor. |
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Post by Decibel on Apr 20, 2016 8:35:56 GMT -5
I saw another revision of convergences board. It's really little respect others.
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Post by dummyload on Apr 20, 2016 9:44:04 GMT -5
The only difference I know of between long and short convergence boards is that the long one has double mosfet's in the output stages (that's 12 more on the heatsink and makes 24 in total for the 6 stages)
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Post by Decibel on Apr 20, 2016 12:34:29 GMT -5
I saw another revision of convergences board. It's really little respect others. Perhaps it's a firstly revision. There isn't a black heatsink. The p/n is R763137 (at right in picture below). Attachments:
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Post by Casethecorvetteman on Apr 21, 2016 2:03:45 GMT -5
One thing i would really like to be able to do with the convergence is reduce the step sizes for the fine adjustments, because often there are a couple sections that dont line up dead on perfect, it is either slightly left or one click over makes it slightly right. Vertical adjustment is not really an issue, but horizontally it is. Making the steps around half the size would really make a huge difference to the overall image quality. For starting you can try to solder a 4k7 resistor parallel with each R104, R134, R164 on convergence output board. With these values the gain would be roughly halved, if the range is too small you can try a bigger resistor. Sounds interesting Gábor, might be worth a try |
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Post by Casethecorvetteman on Apr 21, 2016 2:04:14 GMT -5
The adjustment range is WAY more than is needed.
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Post by Casethecorvetteman on Apr 24, 2016 10:33:06 GMT -5
The only difference I know of between long and short convergence boards is that the long one has double mosfet's in the output stages (that's 12 more on the heatsink and makes 24 in total for the 6 stages) What effect does this have on it all? |
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Post by Casethecorvetteman on Apr 24, 2016 10:36:46 GMT -5
I saw another revision of convergences board. It's really little respect others. Perhaps it's a firstly revision. There isn't a black heatsink. The p/n is R763137 (at right in picture below). Ive not seen that one on the far right before. Looks like the heat sink is the only obvious change between it and the middle one. |
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Post by Decibel on Apr 24, 2016 10:43:03 GMT -5
The board on the left is the latest revision. The board in the center is the previous revision that I removed the heatsink that is identical to the latest revision. The right card is already complete with his different heatsink that's much smaller than others.
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Post by gjaky on Apr 24, 2016 11:42:40 GMT -5
The only difference I know of between long and short convergence boards is that the long one has double mosfet's in the output stages (that's 12 more on the heatsink and makes 24 in total for the 6 stages) What effect does this have on it all? Better heat conduction, less stress on each output FET. |
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Post by Casethecorvetteman on Apr 24, 2016 18:14:27 GMT -5
The board on the left is the latest revision. The board in the center is the previous revision that I removed the heatsink that is identical to the latest revision. The right card is already complete with his different heatsink that's much smaller than others. The middle and left boards i have here. |
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