AN-001 – Interlocking a LaserPak & TECPak with a Relay
The following circuit uses a relay to provide an isolated contact closure for the interlock pins of the 485 Series LaserPak’s output connector.
There are many possible choices for the N-channel FET, but it must have the following capabilities: Vds of 5V or greater; current handling of at least 100mA; and a logic-level FET, as the gate voltage will only be 3.3V.
Likewise, there are many relay choices, but the coil voltage must be 4.5-5V, and draw less than 50mA when operating.
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