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Radio to USB switching circuit help!

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Hi please help I am trying to merge two circuits togehter a RF 2 channel reciever and a stadard USB mouse. My aim is to replace the left and right mouse button with either a relay or transistor switching network. I know there are already units on the market that do this but I want to make myself an extend range one.

Basic circuit: RF Decoder TTL Ouput - Transistor Array - Reed Relay's

I can show you the design I have for the transistor array triggered from the TTL output of the RF decoder but what I want to know is can I remove the relays from the circuit and just have the earth of the mouse circuit switching through the transistors????? I know my termonolgy may be wrong but I am pretty new to the electronics field! :roll:
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