Fran has tested the latest version this weekend.
It actually works beyond the minimum 24V and maximum 100V total rail voltages.
We shall make some final check with the PCB shop, update documents, etc. next week.
Then we should be ready to go with the GB.
Thank you for your patience,
Patrick
It actually works beyond the minimum 24V and maximum 100V total rail voltages.
We shall make some final check with the PCB shop, update documents, etc. next week.
Then we should be ready to go with the GB.
Thank you for your patience,
Patrick
Yes, I carried out some extensive testing this weekend, along with some of the documentation. Happily, all worked as expected, triggering of the protection is very repeatable, and the working supply voltage range was verified.
I will prepare the last few details in the coming days and post the information for the group buy during the week.
fran
I will prepare the last few details in the coming days and post the information for the group buy during the week.
fran
Hello,
I have a few questions that I hope are not too invasive.
Can you clarify why the circuit must be run from the same rails as the main amplifier? If one rail goes down, does the protection circuit immediately open the relay? My last question is, what kind of failure conditions will trip the circuit to open the relays?
Appreciated!
I have a few questions that I hope are not too invasive.
Can you clarify why the circuit must be run from the same rails as the main amplifier? If one rail goes down, does the protection circuit immediately open the relay? My last question is, what kind of failure conditions will trip the circuit to open the relays?
Appreciated!
Yes, and precisely for that reason.
Also the relay MOSFETs are protected from excessive voltage during switching of inductive load by clamping diodes to both rails.
Loss of any one of the rails, differential DC voltage at the amplifier output.
The working principle of the DC trigger is very similar to post #5. Difference is in the details.
Patrick
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Many many thanks to Fran again who has been testing the latest version in his F5EXC with +/-50V rails over many evenings.
He also repeated the trigger timing test multiple times at +/-12V, +/-25V and +/-50V to confirm that they are consistent with the design values.
Patrick
He also repeated the trigger timing test multiple times at +/-12V, +/-25V and +/-50V to confirm that they are consistent with the design values.
Patrick
This is what I did a while ago, seems to work fine, does not false trigger even on 50V 5hz ( simulation ). Disadvantage it takes around 0.5 sec to trigger ( not a problem for subwoofers I think ) . Uses separate supply. Relay turns on on fault . Can be used to short the Speaker relay coil. or be modified to latch after "fault detected ".
Thoughts ?.
Thoughts ?.
Attachments
Hi !, Does Ci high value ( 330uF ) in the input filter " upset " the amp ? or the 1K resistors help with that ?.
I'm also looking for a reliable DC protection for my subwoofer amp. So it might trigger on low freq like 20hz .
I'm also looking for a reliable DC protection for my subwoofer amp. So it might trigger on low freq like 20hz .
Need a solution like the originals as shown at the start of the thread. Can not find them at Aliexpress. Does anyone have a link for me?
Thank you! I don’t know why but when I do a search with exactly the right terms Aliexpress often does not return a usable result. Probably a user error.
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