SSR for speaker protection?

Thanks dear but shipping time is 20-34 days and NO PAYPAL!😡
I have this tested for d.c presence using a led in optocoupler position.
Is it any problem if we increase R2 to something 330k for longer on delay time?
 

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Thanks dear but shipping time is 20-34 days and NO PAYPAL!😡
I have this tested for d.c presence using a led in optocoupler position.
Is it any problem if we increase R2 to something 330k for longer on delay time?

Hi, yes, you can increase R2.
VOM1271 is temporarily out of stock in most distributors. Try rs-online.com, cc 1000 in stock.
vom1271 Stock and Price by Distributor
 
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Each of my two amp channels have their own independent power supply.

l am also using one auxiliary 12 Volt power supply to power the two SSR protection boards.

Do I omit R18 from both SSR boards?
 

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Very neat layout LKA, I notice the small caps between earth and chassis on the inputs. I remember Bonzai advocated it as well. I will try it for sure. No earth loop breakers or special stuff like that to prevent hum and buzz for preventative measures? When I build now then I automatically install an earth loop breaker with a small switch to disconnect it when necessary. Superbbb job !🙂
 
Each power supply GND have LBR (loop breaker circuit) to the chassis.

Groundig scheme:

MAINS_PE -> CHASSIS

LEFT_RCA_COLD -> 10nF -> CHASSIS <- 10nF <- RIGHT_RCA_COLD

LEFT_PSU_GND -> LEFT_LBR -> CHASSIS <- RIGHT_LBR <- RIGHT_PSU_GND

LEFT_AMP_OUT_GND -> 1kOhm -> Ka1_PSU_GND <- 1kOhm <- RIGHT_AMP_OUT_GND


1kOhm = R18 on SSR pcb
LBR = 10R,100nF,antiparallel_diodes (parallel connection)
Ka1_PSU_GND = floating