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FS: Speaker protector using solid state relay
FS: Speaker protector using solid state relay
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Old 18th May 2019, 07:48 PM   #11
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by av-trouvaille View Post
Did you receive my payment?
Yes items were sent off yesterday.
Check your PM's.
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Old 21st May 2019, 10:18 PM   #12
nigelwright7557 is offline nigelwright7557  United Kingdom
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Still 2 of each left if anyone is interested.
2 with mains transformer on pcb.
2 without mains transformer on pcb.
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Old 26th May 2019, 09:12 PM   #13
nigelwright7557 is offline nigelwright7557  United Kingdom
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The ones with mains transformers are UK 230VAC mains transformers.
If you don't have 230VAC mains you can buy the version with out a transformer on board and add your own local transformer.
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Old 5th June 2019, 04:24 AM   #14
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by nigelwright7557 View Post
Still 2 of each left if anyone is interested.
2 with mains transformer on pcb.
2 without mains transformer on pcb.
Still 2 of each left.

The mains transformer pcb's have UK mains transformers on.
The ones without a transformer can have local mains transformers added i.e. 100VAC USA.
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Old 6th June 2019, 06:34 PM   #15
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by nigelwright7557 View Post
The ones without a transformer can have local mains transformers added i.e. 100VAC USA.
Should have read 110VAC.
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Old 7th June 2019, 06:28 PM   #16
nigelwright7557 is offline nigelwright7557  United Kingdom
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I have built up a new version with DC detect, over current detect and mains failure detect.
On power up SSR is held off for 4 seconds and on power down the SSR is disconnected.
There's a lot on the pcb so its not cheap but I am selling at cost of components.
Note UK mains only (230VAC)
19-99 + 3-99 p+p to UK and 12-99 to rest of world.
Click the image to open in full size.
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Last edited by nigelwright7557; 7th June 2019 at 06:32 PM.
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Old 8th June 2019, 03:47 AM   #17
ZeAudius is offline ZeAudius  Portugal
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I may get one of your SP boards, but check my PM.
Regards
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Old 8th June 2019, 06:32 AM   #18
Tromperie is offline Tromperie  Australia
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Nigel,
I did see a post from a while back asking about a multi-channel speaker protector, that is, a board that can monitor and protect a 3 or, preferably, 4 way active speaker. Given many people have on this forum have actives, I wonder if you had ever considered such a design. It has the advantage of one PCB and not 3/4 for each amp with the commensurate space and wiring demands. A LED could indicate the faultamp, for example.

Is this a practical idea?
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Old 8th June 2019, 03:15 PM   #19
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by Tromperie View Post
Nigel,
I did see a post from a while back asking about a multi-channel speaker protector, that is, a board that can monitor and protect a 3 or, preferably, 4 way active speaker. Given many people have on this forum have actives, I wonder if you had ever considered such a design. It has the advantage of one PCB and not 3/4 for each amp with the commensurate space and wiring demands. A LED could indicate the faultamp, for example.

Is this a practical idea?
It would be big and expensive so not a very attractive project.
For just DC detect my pcb is 100mm by 100mm.
My other pcb which does dc detect, over current detect and mains fail that is 160mm by 106mm for just one channel.
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Old 8th June 2019, 11:39 PM   #20
nigelwright7557 is offline nigelwright7557  United Kingdom
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Originally Posted by Tromperie View Post
Nigel,
A LED could indicate the faultamp, for example.

Is this a practical idea?
I already use an LED to show amp is in protect mode.

I spent a bit more time developing my dc detect, over current detect and mains fail detect protection circuit.
The over current detect can be set up using a trimmer from about 1 amp to 12 amps.
I got stuck into the software as it was taken from a simple DC detect protection circuit. It was quite easy before to just time things using instruction cycles. But with overheads of over current detect and mains failure this became inaccurate. I now use the PIC timer 0 to count up milli-seconds for dc detect and mains failure.
Mains failure now turns of the SSR and checks to see if mains returns before going through power up sequence again. This ensures system cant get stuck on a mains failure only to find mains comes back and is ignored.
Works very well now.
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