SSR for speaker protection?

[Bonsai]

Hello thimios,

you can try these. I will look at ON later today if I get time (I know the Nexperia ones quite well - worked there for 10 yrs )

 

[thimios]

I do not recommend going for more than 50V power supply (SSR2). The protection is designed for max 200W/4R. I have a new PCB layout (SSR3), a larger heatsink (PSU up to 60V), three options for the optodriver (VOM1271, ASSR-621, Si8752). A prototype PCB is on the way, as soon as I verify the functionality, I can publish it.

Thanks LKA,will wait for this new version.
Those vom1271t is out of stock too and is a big advantage any alternative but available opto.

 

[Bonsai]

Hello thimios,

you can try these. I will look at ON later today if I get time (I know the Nexperia ones quite well - worked there for 10 yrs )

 

[thimios]

Hello thimios,

you can try these. I will look at ON later today if I get time (I know the Nexperia ones quite well - worked there for 10 yrs )

Thanks again Bonsai!

 

[Hicoco]

I do not recommend going for more than 50V power supply (SSR2). The protection is designed for max 200W/4R. I have a new PCB layout (SSR3), a larger heatsink (PSU up to 60V), three options for the optodriver (VOM1271, ASSR-621, Si8752). A prototype PCB is on the way, as soon as I verify the functionality, I can publish it.

Thank LKA can't wait....The Power of SR200 is 200W/8R

 

[Hicoco]

I do not recommend going for more than 50V power supply (SSR2). The protection is designed for max 200W/4R. I have a new PCB layout (SSR3), a larger heatsink (PSU up to 60V), three options for the optodriver (VOM1271, ASSR-621, Si8752). A prototype PCB is on the way, as soon as I verify the functionality, I can publish it.

I have all the SR200's Transistors soldered in the bottom side of my board, see pic.
LKA do you think that could be a possibility or an option to have T6 who could be soldered on the bottom side with a hole on the board to be able to fix it on the main heatsink ? thanks

 

[DaveFred]

I do not recommend going for more than 50V power supply (SSR2). The protection is designed for max 200W/4R. I have a new PCB layout (SSR3), a larger heatsink (PSU up to 60V), three options for the optodriver (VOM1271, ASSR-621, Si8752). A prototype PCB is on the way, as soon as I verify the functionality, I can publish it.

Eager to see your results!

 

[jameshillj]

Hi LKA,
That SSR3 board is a very neat piece of design - it reminds me of the discrete ladder volume control.

I look forward to it's check/completion and possible GB or list on the diyA shop.

 

[LKA]

I tested the fet driver Si8752. The turn-off is pretty fast.

 

[LKA]

Si8752 input side current If=12mA ((9V-2.2V)/560R)
Si8752 driver side voltage VG(ON)=9.7V
Si8752 driver side impedance RG=200k-300k (datasheet page 9, If=10mA)
FET total gate cap 2x10nF

approx
turn-on delay 2.5msec
turn-on time 1msec
turn-off delay 60usec
turn-off time 20usec

 

[wgh52]

Hi LKA!

Thanks a lot for sharing! The Si8752 is my Standard MOSFET driver for SSRs since some time and works well in several Applications. So this looks reassuring.

Regards,
Winfried

 

[andrewlebon]

Hello LKA
greetings is it possible to tell the value of RS1/RS2 resistors on the anode
kathode of led in optocoupler 817
warm regards
Andrew

 

[thimios]

Si8752 input side current If=12mA ((9V-2.2V)/560R)
Si8752 driver side voltage VG(ON)=9.7V
Si8752 driver side impedance RG=200k-300k (datasheet page 9, If=10mA)
FET total gate cap 2x10nF

approx
turn-on delay 2.5msec
turn-on time 1msec
turn-off delay 60usec
turn-off time 20usec

Excellent!
No need for this bustard Vom1271t!
Mouser have 1.943 pieces in stock now.
PS. Finally i have some vom1271t on hand now!

 

[LKA]

Hello LKA
greetings is it possible to tell the value of RS1/RS2 resistors on the anode
kathode of led in optocoupler 817
warm regards
Andrew

try RS1 22R-47R, RS2 do not connect

 

[andrewlebon]

Hello LKA
greetings and many thanks for replying is it possible to share simple latch
schematics for me to try i am a newbie
warm regards
Andrew

 

[DaveFred]

I do not recommend going for more than 50V power supply (SSR2). The protection is designed for max 200W/4R. I have a new PCB layout (SSR3), a larger heatsink (PSU up to 60V), three options for the optodriver (VOM1271, ASSR-621, Si8752). A prototype PCB is on the way, as soon as I verify the functionality, I can publish it.

Did your Prototype PCB's show up?

 

[LKA]

Not yet. 3 weeks delay at customs in Germany. I will have a PCB tomorrow or a day later.

 

[rsavas]

I do not know where you had your pcb made but when I use jlcpcb, I order with the DHL option to pay tax and customs brokerage included so no delays at customs or DHL

 

[DaveFred]

What are the differences between V2 and V3?

 

[LKA]

Mainly pcb layout.

Differences, V3 has:
- 3 options for optodriver
- optional RC zobel network at output (R100+C100)