===== Chinese 8 Relay Board =====
This one is a little variation of the one I got 3 years ago.  This one has a separate terminal strip to supply interface Vcc, visible on the right near the bottom. \\
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The interface can be totally isolated from the relay logic. The following 2 hookup diagrams illustrate the interface hookup. The interface only needs ground and an activation signal to activate a channel.  The diode which will be turned on by the logic signal will optoisolate the input.\\

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