I am hoping to use Radio Control Servos to move the points and signals, so decided to part with a bit of cash and obtain a Servo Control unit and Servo from MUTR (Middlesex University Training Resources - Mindsets Online) and a couple of relays and DPDT switches.
Now that I have taken delivery of said electronic items I am actively trying to decide how best to make everything work. Hopefully the diagram below shows my first thoughts on how to connect everything up. The 2 resistors will hopefully give about 20% and 60% throw on the servo, although I intend using a 10K potentiometer in place of each resistor on the test bench so that I can better determine the exact level of resistance to be put in each leg of the circuit to give me the throws I require to move the point switch blades.
The theory is that when current is applied across the relay (by the DPDT switch) one level of resistance will be applied, when no current is applied the other level of resistance will be applied hence giving two different amounts of throw on the servo. The DPDT switch will also control the polarity of the Point frog.
I'll let you all know how I get on
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