The prototypes are tested ok. 😊
But I only have+/-25V supplies.
So Fran will also solder one and test at +/-50V before releasing.
Watch this space.
Patrick
But I only have+/-25V supplies.
So Fran will also solder one and test at +/-50V before releasing.
Watch this space.
Patrick
The maximum voltage is limited by the components used, as well as dissipation.
Beyond 100V total rail voltage, choice of components becomes difficult.
The nice thing is, it uses the amp power rails and requires no auxiliary supplies.
And if the amp supply should fail, the protection kicks in automatically.
Patrick
Beyond 100V total rail voltage, choice of components becomes difficult.
The nice thing is, it uses the amp power rails and requires no auxiliary supplies.
And if the amp supply should fail, the protection kicks in automatically.
Patrick
That depends on whether +/-50V, or 50V single rail.
Also depends on single ended (And referenced) output, or BTL.
The comments in post #23 refers to the protection circuit of course.
Not to the amplifier.
Patrick
Also depends on single ended (And referenced) output, or BTL.
The comments in post #23 refers to the protection circuit of course.
Not to the amplifier.
Patrick
Fran is in the process of building and testing.
Only when everything works for him as well before we can release for public use.
Thank you for your interest,
Patrick
Only when everything works for him as well before we can release for public use.
Thank you for your interest,
Patrick
After some minor issues, Fran got it working at +/-50V.
We shall make one more revision to make it more robust at high rail voltages.
So won't be too long now.
Thanks to Fran for the Beta test.
Patrick
We shall make one more revision to make it more robust at high rail voltages.
So won't be too long now.
Thanks to Fran for the Beta test.
Patrick
No, because I can't find any suitable switching MOSFETs with high voltage, low on-resistance, and low gate charge.
Unless you want to propose one (rated at 1.5x the voltage you intend to use them for) ?
Also the rest of the circuit would have to be able to cope with the high voltage.
Too many compromises, and limited demand.
Patrick
Unless you want to propose one (rated at 1.5x the voltage you intend to use them for) ?
Also the rest of the circuit would have to be able to cope with the high voltage.
Too many compromises, and limited demand.
Patrick
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Are there many amps ≤120Wpc with enough space for these boards? Those I've owned have been compact. My 150, 200 & 250Wpc amps are progressively roomier inside...the 150 could be a challenge.
Well, I think you are at the Pass forum, not ?
I believe the majority of the projects here are <<100W ?
I think you can easily find one of the many protection boards on offer elsewhere to suit your application, for example :
diyaudiostore.com/products/soft-start-speaker-turn-on-delay-and-dc-protector-boards
Our board as shown in post #20 measures 30x58mm, BTW.
Patrick
I believe the majority of the projects here are <<100W ?
I think you can easily find one of the many protection boards on offer elsewhere to suit your application, for example :
diyaudiostore.com/products/soft-start-speaker-turn-on-delay-and-dc-protector-boards
Our board as shown in post #20 measures 30x58mm, BTW.
Patrick
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Another update :
Fran and I have been making enquiries and updating PCBs and Documents.
So here is what happens next.
People who know me know that I do not support buying finished modules.
That is not DIY that I want to support.
But in view of potential difficulties in soldering the SMT power MOSFETs, we have looked into supplying PCBs with the devices already soldered.
We specifically did not ask for complete assembly of all SMD components.
The PCB shop does not stock the specific Toshiba MOSFET we have been using.
Luckily, we found one from Infineon which has practically same specifications.
And PCB shop stocks them. So we can offer those pre-assembled.
Fran will order the latest version PCB again (already the 7th version), together with the new MOSFETs.
We expect them in about a week.
He will run them through the same test with +/-12V as well as +/-50V rails, just to be absolutely sure.
Then we are ready for a GB. Precondition is minimum 100 single channel protection boards.
Postage world wide from Ireland with tracking is ~15€.
In order that the postage is not becoming excessively dominant, we shall order a 4-PCB bundle.
i.e. subscriptions is in multiples of 4.
Exact pricing still to be confirmed, but is likely to be 14~16€ per PCB sub-assembly, of which ~8.50€ are cost of FETs including EU tax.
Plus postage.
Additional cost to complete the build is less than 15€ per channel.
Once Fran is through with the last bit of testing, we shall open a GB thread.
As usual, you will receive instruction documents together with the boards.
Thank you for your interest,
Patrick
Fran and I have been making enquiries and updating PCBs and Documents.
So here is what happens next.
People who know me know that I do not support buying finished modules.
That is not DIY that I want to support.
But in view of potential difficulties in soldering the SMT power MOSFETs, we have looked into supplying PCBs with the devices already soldered.
We specifically did not ask for complete assembly of all SMD components.
The PCB shop does not stock the specific Toshiba MOSFET we have been using.
Luckily, we found one from Infineon which has practically same specifications.
And PCB shop stocks them. So we can offer those pre-assembled.
Fran will order the latest version PCB again (already the 7th version), together with the new MOSFETs.
We expect them in about a week.
He will run them through the same test with +/-12V as well as +/-50V rails, just to be absolutely sure.
Then we are ready for a GB. Precondition is minimum 100 single channel protection boards.
Postage world wide from Ireland with tracking is ~15€.
In order that the postage is not becoming excessively dominant, we shall order a 4-PCB bundle.
i.e. subscriptions is in multiples of 4.
Exact pricing still to be confirmed, but is likely to be 14~16€ per PCB sub-assembly, of which ~8.50€ are cost of FETs including EU tax.
Plus postage.
Additional cost to complete the build is less than 15€ per channel.
Once Fran is through with the last bit of testing, we shall open a GB thread.
As usual, you will receive instruction documents together with the boards.
Thank you for your interest,
Patrick
Just an update folks.
The last bit of testing is still in progress - parts are here now, and boards will be here in another 1.5-2 weeks. Once this last bit of testing is out of the way, we will move on to a group buy. I don't expect any problems, but I always believe its good to "trust but verify" - test fully and effectively than try to fix afterwards.
Fran
The last bit of testing is still in progress - parts are here now, and boards will be here in another 1.5-2 weeks. Once this last bit of testing is out of the way, we will move on to a group buy. I don't expect any problems, but I always believe its good to "trust but verify" - test fully and effectively than try to fix afterwards.
Fran
Is there any chance to get the Gerber files (or Kicad) and order from the fabs ourselves as many of us probably would like to use this for many of our Pass projects.
Thanks and have a great weekend!!
Fred
Thanks and have a great weekend!!
Fred
You can always get it from us.
Or you order lifetime stock now. 😊
If one day Fran and I both retire completely from DIY, we may consider offering it to the DIY Store.
If they want it, that is.
We don't use KiCad, BTW.
Patrick
Or you order lifetime stock now. 😊
If one day Fran and I both retire completely from DIY, we may consider offering it to the DIY Store.
If they want it, that is.
We don't use KiCad, BTW.
Patrick