2000 question- AC track circuit attempt

[Peter]

Thanks for your response Peter.

I see what you are getting at with your second point - an increase in capacitance results in a decrease of the capacitors reactance and thus an increase in rail voltage. So an answer of 9uF would have been more accurate to give the 1V rail voltage calculated (would give approx 1.02V).

I shall have a look at the train shunt next.

Darren

More importantly, you need at least a volt to pick the relay, so don't look for the closest voltage, look for the one that will do what you need.