Hello, I am new to this and would appreciate if someone can help with this. I have a laser that needs 0-5V TTL for quick turn on/off. I have the connection points for the TTL input in the interlock pins. However, how do I build the TTL circuit? What are the parts that is required to enable this - I have a 24V power supply but if someone can point me to the process I can get help from an electronics shop to get the TTL switch built. Many thanks