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SSR for speaker protection?
SSR for speaker protection?
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Old 12th November 2018, 09:17 AM   #21
jacques antoine is offline jacques antoine  France
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SSR for speaker protection?
This project is interesting but hard to follow: could someone please post the actual schematics debated here? Thanks.

Jacques
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Old 12th November 2018, 12:09 PM   #22
Mooly is offline Mooly  United Kingdom
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SSR for speaker protection?
The solid state relay is only part of the picture. Post #22 here show the relay made from two FET's and a photovoltaic coupler.

Output Relays

How you drive/interface the coupler is dependent on the protection circuit you are fitting the relays to.
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Old 12th November 2018, 01:46 PM   #23
LKA is online now LKA  Europe
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One can use protection like this. On the left - DC detector, on the right - AC detector. Photovoltaic coupler is powered by CCS. R2,C3 - ON delay. T6 requires a heatsink.

SSR-protect-2.0.JPG
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Old 12th November 2018, 02:08 PM   #24
jacques antoine is offline jacques antoine  France
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SSR for speaker protection?
Thanks LKA I get it now.
In which way is the discrete version better that the uPC1237 one you posted on #9 ?
I have used this chip in the past (with conventional relays) and still have several in stock.
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Old 12th November 2018, 05:13 PM   #25
LKA is online now LKA  Europe
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Quote:
Originally Posted by jacques antoine View Post
Thanks LKA I get it now.
In which way is the discrete version better that the uPC1237 one you posted on #9 ?
I have used this chip in the past (with conventional relays) and still have several in stock.
- hard to get genuine
- max 60V Vcc
- power on delay circuit -R7,C7(see DS)- increases the switch ON rise time ( I measured "ebay version" )
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Old 19th December 2018, 09:24 PM   #26
cakyol is offline cakyol  United States
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Hi LKA, Do you sell these boards ?
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Old 20th December 2018, 06:53 AM   #27
thimios is offline thimios  Greece
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Quote:
Originally Posted by LKA View Post
One can use protection like this. On the left - DC detector, on the right - AC detector. Photovoltaic coupler is powered by CCS. R2,C3 - ON delay. T6 requires a heatsink.

Attachment 715137
Values of parts please
Can you post the pcb for home etching?
I'm strongly interested

Last edited by thimios; 20th December 2018 at 07:03 AM.
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Old 20th December 2018, 08:51 AM   #28
LKA is online now LKA  Europe
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I do not sell pcb because I have never implemented it as separate board.
A working example you can see here (integrated part of an amp).
Component values are valid for +-40VDC PSU.
K51 - 120W/4R CFA POWER AMPLIFIER - Google Photos

Attached schematic is for +-90VDC.
Thimios, what is your PSU voltage ?

SSR for speaker protection?-mosfet-protect-90vdc-jpg
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File Type: jpg mosfet-protect-90VDC.JPG (124.9 KB, 434 views)
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Old 20th December 2018, 02:14 PM   #29
emilvv is offline emilvv  Bulgaria
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Default +- 50 VDC

Hello,

Please, post values for +- 50VDC supply ..... THANK YOU

Emil
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Old 20th December 2018, 02:37 PM   #30
thimios is offline thimios  Greece
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Quote:
Originally Posted by LKA View Post
I do not sell pcb because I have never implemented it as separate board.
A working example you can see here (integrated part of an amp).
Component values are valid for +-40VDC PSU.
K51 - 120W/4R CFA POWER AMPLIFIER - Google Photos

Attached schematic is for +-90VDC.
Thimios, what is your PSU voltage ?

Click the image to open in full size.
Hi dear LKA,i have some amplifiers using +/-50v and some other using +/-35v or +/-42v.
As you haven't pcb for sale,please post the gerbers or whatever file you have for.
P.S just now i see the k51 using +/-40v.

Last edited by thimios; 20th December 2018 at 02:45 PM.
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