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Oh definitely from the bus, though if your bus is broken into power districts or detection blocks you’d want to feed from the same segment as the turnout rails are being fed.

Continuing on, because... why not? Here are proposed circuits for controlling Atlas (twin coil) or Kato (single coil) solenoid machines from the same servo controller output:

Atlas:
118819
...

Nice work on the ballasting!

I'd say on the photos, it depends on the purpose of the photo. I agree with the others, the edited one is nice to show what you want it to look like, but it's also...

On the bright side... guaranteed work... ?

Could be write cycles, but at 10 years, those chips are getting some gray in their beards... could simply be age. Is anyone doing a detailed post-mortem on these? The board manufacturer maybe? I'd...

Indeed. This is a well known problem in computing with non-volatile memory and there are a number of strategies to deal with it. One of the easiest, perhaps, is to cycle locations. Instead of...

I'm too far out of school. I forgot the trick of using the clock as the INPUT to the flip flop. Good one, Heiko.

I'm not happy with the datasheet on that specific chip either. It is...

I think on consideration, I'm ready to call the circuit with the L9110 motor driver (post #20), possibly with the added pulldown on Q1's gate a win. I appreciate everyone's help and feedback. We...

Happy Birthday!

Tortoises are designed to be powered all the time. Their stall current is very low. The pull-up/down isn't a bad idea - at least it would always go to the same position. Add a jumper and the user...

I’m assuming the driver chip’s internal logic will manage the short circuit situation. It’s not just a straight-up H-bridge.

OK, here's another stab. It uses an Adafruit L9110 motor driver chip, which is available in an 8DIP package, can handle plenty of current, and can take a 5V logic input and drive a 12V output. I...

The generosity of folks on this site w/r/t their knowledge, time and stuff never ceases to amaze me.

Happy Birthday!!

After sleeping on this a bit, it would seem the simplest solution to this would be to use an inverter (possibly a 7405-ish thing or just an nMOS and a pullup) to provide the "opposite" signal needed...

yes. Yes it would. I’ve got some work to do.

Happy Birthday!!

I have one at home for web browsing and stuff like that. The two most useful things I find it for are recipes in the kitchen and sheet music in the music space. The one I have flips from a laptop...

Depends on the wiring. On my layout, running an additional set of bus wires would be MUCH easier than stripping out and replacing the existing bus. But that's mostly my messy wiring practices :lol:

I could, in SPICE (or PSPICE), but my development environment is... in transition... so I'm not really set up at the moment to do so. This might be a reason to get that back up and running.

This circuit is an H-bridge... just in discrete components, instead of in a single package :), but yeah, using an H-bridge chip would make the wiring a lot simpler.

As far as the load on the...

Y'all with electronics experience, check my work here, please... I don't have a Tortoise to test against, but I *think* this should work...

This is an "adapter" circuit for driving a Tortoise...

If he was installing new, or if the layout was exhibiting problems, I'd be right there with you... but unless I've gotten lost in this thread, his layout isn't showing any symptoms of wiring trouble....

I’ll be the contrarian voice. While I’d normally advise that there’s no such thing (within reason) as a too-large main bus, if it passes the quarter test all over the layout I don’t think I’d go to...

The NCE auto-reverser has a built-in circuit breaker. It's a bit more complicated to detect a short and decide whether it's an auto-reverse situation or an actual short circuit. Not a lot more...