Wiring of the Control Panel is moving at pace! I've started work on some of the electronics that I need, first up is the DC power board:
This gives me 1 x 5V for some future electronics for indication lights and signal interlocking and 2 x 12V for powering the signals and point detection.
Next is the diode matrix for the fiddle yard:
This will be controlled via buttons on the main panel.
Finally the capacitor discharge unit:
I've used a circuit from http://www.talkingelectronics.com/projects/CDU-2/CDU-2.html which I've built up on stripboard using the layout below:
Still more to be done - a diode matrix for the front boards is needed. As I'm using LEDs on the diagram to show both track power and point indication, I need to use some some logic gates to ensure the right LEDs are lit. This means I need a few transistors to create an interface between the 12V circuit and the 5V circuit. All good fun!
This gives me 1 x 5V for some future electronics for indication lights and signal interlocking and 2 x 12V for powering the signals and point detection.
Next is the diode matrix for the fiddle yard:
This will be controlled via buttons on the main panel.
I've used a circuit from http://www.talkingelectronics.com/projects/CDU-2/CDU-2.html which I've built up on stripboard using the layout below:
Update: Once tested I found it didn't really have enough power for throwing three points at the same timeso I've increased the two capacitors from 1000µF to 2200µF which seems to be doing better.
Still more to be done - a diode matrix for the front boards is needed. As I'm using LEDs on the diagram to show both track power and point indication, I need to use some some logic gates to ensure the right LEDs are lit. This means I need a few transistors to create an interface between the 12V circuit and the 5V circuit. All good fun!
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