The relay board has been designed to be mounted near the Modulator boards.
It has 2 relays of 12V connected in series ( Re 8 and Re 9 ).
There is also a solder place for a resistor ( RR )in case you would like to use relays with a lower voltage.
Normally, when using the 12V relays, this Resistor can be replaced by a jumper wire.
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