Speaker Protection Board

[andrewlebon]

solid state protection

Ready for testing waiting for parts to arrive.
warm regards
Andrew

 

[Bonsai]

You could have just ordered a board for $9.50 + postage Andrew

 

[asuslover]

Paypal checkout says 12.95$ + shipping , still a great deal but not 9.5$.

 

[stinius]

You could have just ordered a board for $9.50 + postage Andrew

Hi Andrew

In my opinion it's a good design that you have put up and it's very well documented on your site.
You must have used some of time to design the circuit and to do the PCB layout.

I'm sad when I see that some are actualy taking a finished design and do their "own" PCB layout and plan to sell it at a few cents lower price.

It seems like Alex MM is the so called PCB "designer"
Does anybody think think that Alex MM will answer any technical questions regarding the design?
No, the plan is to "take the money and run" and leave it to Bonsai to answer all the technical questions even if they bought the boards from Alex MM.

It's too bad

Stein

 

[Bonsai]

Agree Stein. It will cost more to get the boards made than just buying it off the webpage!


@Asuslover - sorry I meant £9.50 which comes out at about $12.95

 

[jwilhelm]

The Alex MM board is actually not safe to use! Designers need to watch creepage distances.

It's nice to see some more options with SS relays.

 

[andrewlebon]

Please this is not for comercial use nor is anyone interested in selling the pcb
for a lower price my mistake i thought it was a pure DIY project SORRY please
delete all posts i have posted.
warm regards
Andrew

 

[asuslover]

Hi Andrew

In my opinion it's a good design that you have put up and it's very well documented on your site.
You must have used some of time to design the circuit and to do the PCB layout.

I'm sad when I see that some are actualy taking a finished design and do their "own" PCB layout and plan to sell it at a few cents lower price.

It seems like Alex MM is the so called PCB "designer"
Does anybody think think that Alex MM will answer any technical questions regarding the design?
No, the plan is to "take the money and run" and leave it to Bonsai to answer all the technical questions even if they bought the boards from Alex MM.

It's too bad

Stein

AlexMM is indeed a very good pcb designer. I tried to buy some boards from him a few years back and he told me he never sells boards and he never shares gerber files.
Now , I am not sure how Andrew got this board designed by AlexMM. Maybe he wants to explain this .
Bonsai , I am getting this board from you for sure, but I don't have that uPC1237, any trusted sources in US?
Thanks

 

[jacques antoine]

Before getting on Andrew' and AlexMM's backs, please note that apart from the Vom/Fet output, their PCB (the one on the left) is based on a schematics significantly different from Bonsai's.

 

[thimios]

Hi Andrew,from where you send boards?
I ask because of Brexit .

 

[Bonsai]

From the UK Thimios. Because it goes as standard International airmail, there don't seem to be any problems. Would not be the case if it was food, drink or medicines though.

 

[Bonsai]

@asuslover, best option is to get the IC from Cricklewood electronics in London - link posted earlier.

These are the genuine IC's. I've built 2 boards for testing and they work perfectly.

I will try to find some other sources - just been busy the last few weeks.

 

[ctrlx]

Did you try ASSR-V621-002E , Dual channel photovoltaic Mosfet Driver?

what is the differance between ASSR-V621 and ASSR-V622 photo-voltaic FET drivers?

 

[jwilhelm]

The inputs are reversed between ASSR-V621 and ASSR-V622, otherwise they are identical.

 

[Hicoco]

THE OUTPUTS (NOT THE INPUTS) ARE REVERSED

 

[ctrlx]

https://docs.broadcom.com/doc/AV02-0259EN


what does this mean for the connection to g/s of mosfets?
reverse the connections or use p-channel?

 

[jwilhelm]

THE OUTPUTS (NOT THE INPUTS) ARE REVERSED

Yes you are right, it is the output that's reversed.

 

[jwilhelm]

https://docs.broadcom.com/doc/AV02-0259EN


what does this mean for the connection to g/s of mosfets?
reverse the connections or use p-channel?

You could do either. The output is a self contained floating supply so either device could be used with either P or N channel, just connect accordingly. If you mess up the layout and get them reversed, use the other device instead.

 

[Bonsai]

You can also stack the two outputs (ie wire them in series) to get much faster switching times. Since the input to a power mosfet is capacitive, it follows from basic principles it=CV that switching is faster with the higher voltage because the CV product is greater. .

On my commercial,smps, I switch 60A in under 100 us using this technique ( I used 2x VOM127 per channel).

 

[Hicoco]

What will be the difference if we wire them in parallel?