Please help with discreet SSR - Electronic Circuits Projects Diagrams Free

Ravenloft · 21st July 2008, 04:25 AM

Hello,
I am looking for help designing a discreet SSR.

The circuit will be used to control a 12Vrms output. The voltage drop needs to be very low (less than 0.2v) across the output contacts). The max load current is 6A rms.

The input control signal will be 5v DC, but I can level shift it up to 12 volts if needed.

I've seen optically isolated SSRs, but I would like to use a discreet solution.

Can someone help with circuit ideas?

Thanks!

kchriste · 21st July 2008, 05:56 AM

Here is one that doesn't use optical isolation:
http://www.discovercircuits.com/PDF-FILES/fetssr.pdf
I wouldn't consider this circuit "safe" for 120VAC use, but 12Vac should be fine.

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21st July 2008, 04:25 AM	(permalink)
Ravenloft	Please help with discreet SSR Hello, I am looking for help designing a discreet SSR. The circuit will be used to control a 12Vrms output. The voltage drop needs to be very low (less than 0.2v) across the output contacts). The max load current is 6A rms. The input control signal will be 5v DC, but I can level shift it up to 12 volts if needed. I've seen optically isolated SSRs, but I would like to use a discreet solution. Can someone help with circuit ideas? Thanks!

21st July 2008, 05:56 AM	(permalink)
kchriste	Here is one that doesn't use optical isolation: http://www.discovercircuits.com/PDF-FILES/fetssr.pdf I wouldn't consider this circuit "safe" for 120VAC use, but 12Vac should be fine. __________________ --- The days of the digital watch are numbered. --- Last edited by kchriste; 21st July 2008 at 05:58 AM.