Hi
I'd like to develop a circuit for switching the points on a model railway and wondered if someone might give me some ideas...
The point motor needs a short burst of power only, say 15v dc and 1 amp, since a continuous current would burn out the point solonoid.
Therefore the circuit really needs to mimic a push button switch.
When a voltage is applied to the circuit it should only allow through a short burst of power to the point motor and then nothing (even though a voltage is still being applied to the circuit, ie. it is still switched on).
It will then not allow another burst through until the power to the circuit is switched off and back on again.
I can see this could perhaps be done using a capacitor, which will only allow a voltage through until it is fully charged. However when the voltage to the circuit is cut the capacitor will remain charged, and so will not work again when the voltage is re-applied.
The capacitor would need to automatically discharge as soon as the circuit is switched off, so that it is then ready for the next switching action.
Please could someone guide me in the right direction for a solution?
Thanks
I'd like to develop a circuit for switching the points on a model railway and wondered if someone might give me some ideas...
The point motor needs a short burst of power only, say 15v dc and 1 amp, since a continuous current would burn out the point solonoid.
Therefore the circuit really needs to mimic a push button switch.
When a voltage is applied to the circuit it should only allow through a short burst of power to the point motor and then nothing (even though a voltage is still being applied to the circuit, ie. it is still switched on).
It will then not allow another burst through until the power to the circuit is switched off and back on again.
I can see this could perhaps be done using a capacitor, which will only allow a voltage through until it is fully charged. However when the voltage to the circuit is cut the capacitor will remain charged, and so will not work again when the voltage is re-applied.
The capacitor would need to automatically discharge as soon as the circuit is switched off, so that it is then ready for the next switching action.
Please could someone guide me in the right direction for a solution?
Thanks