18 V with LM431
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The picture shows the SSR01 and the difference between SSR01 and SSR02 is all electrolytic caps (turned 180 deg), LED's, diodes, zeners (turned 180 deg). Otherwise the mounted will be the same. Please check carefully the parts placement documention and the silkscreen print in the pcb. The yellow stripe is cathode or the short leg of the LED. Notice also the yellow dot at the opamp.