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Old 24th February 2013, 06:31 PM   #421
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Hi permaneder,

they keep you busyyyy......
Hi generg,

nnnnnot really
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Old 24th February 2013, 06:49 PM   #422
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OK, now that I looked at the 2SK2013 datasheet I understand the choice of the source resistors better.
The gate−source has a voltage rating of 20V, so with a 20V PS you can keep the source resistors low, but with a 22V PS you can lower the voltage a little that the mosfets see if you use source resistors of 0.68 ohm
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Old 24th February 2013, 11:47 PM   #423
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Hi,

Trying NOT to be a PIA, would/could you add a separate 0 volt point for the new added caps (thank you for that) to keep it away from the signal 0 volt point - current flow transients and all that 'stuff'
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Old 25th February 2013, 12:04 AM   #424
tinitus is offline tinitus  Europe
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and create a ground loop ?
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Old 25th February 2013, 01:25 AM   #425
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Georg,

As an Alternative to using the 0 volt point on the pcb as the central Gnd point, the provision for operating this pcb with the central 0 volt point located at the power supply Regulator 0 volt point - an Option, if you will.

Also, if we were to continue this analogy, could you add a further provision to add a resistor between the signal input -ve wire and the pcb's gnd point. - it's a neater way of diong this if it's required - another Option

Sorry to add what might be seen as 'nit picking' things but options are so good to see on pcbs, especially if these don't produce problems.
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Old 25th February 2013, 04:25 AM   #426
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Georg,

Also, if we were to continue this analogy, could you add a further provision to add a resistor between the signal input -ve wire and the pcb's gnd point. - it's a neater way of diong this if it's required - another Option
James,

It is my pleasure . Even though I don't believe that it is necessary, I have isolated signal ground from 0V by RX.

Changes at the regulator boards are not longer possible without extra cost, as my boards producer's preparation work has been done already.
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Old 25th February 2013, 05:33 AM   #427
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It looks to be a completed design - I think that this pcb, and your supply brd will be around for quite awhile - many thanks.
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Old 25th February 2013, 11:29 AM   #428
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I think that this pcb, and your supply brd will be around for quite awhile ...
especially if there will be ok 'alternative' mosfet replacements
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Old 26th February 2013, 02:42 AM   #429
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James,

It is my pleasure . Even though I don't believe that it is necessary, I have isolated signal ground from 0V by RX.

Changes at the regulator boards are not longer possible without extra cost, as my boards producer's preparation work has been done already.
Were you able to double up on the number of regulators per board?

Rush
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Old 26th February 2013, 06:03 AM   #430
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Were you able to double up on the number of regulators per board?

Rush
Hi Rush,

First, the preparation work is already done by my boards supplier. Modifications now would cost additional EUR 45 at least.

Second, it would be necessary to considerably enlarge the boards’ sizes to guarantee a certain space between the MOSFETs to avoid thermal issues. More area = more money.

So, if you really want more current, I suggest to point-to-point wire the additional transistor(s). Be careful to solder the gate stopper resistors very close the transistors’ legs. There is no need to double the small capacitors and Zeners at the drains and sources yet.

Another solution might be the use of IRFP140/IRFP9140 (31A/21A)for example for more current.

Georg

Last edited by permaneder; 26th February 2013 at 06:19 AM.
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