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Dr_C

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Dr_C

297 posts

DIGITAL MODE

Yes... with above two modified track pieces in place the ARC PRO performs in full DIGITAL mode as per the C7042 APB. All curved lane changers can remain in play whether modified or not!

ANALOG MODE

Then, with two modified track pieces swapped out for standard track, the ARC PRO performs in ANALOG mode as per the C7042 APB (except a fine point of detail that there is no function in the ARC PRO to reverse the direction of travel). Howver, in this mode curved lane changers may only be kept in play if they have at least been snipped using the standard digital to analog mod. This is precisely the same requirement when using curved lane changers with the C7042 APB in analog mode.

I can confirm all of the above (I.e. Both digital and analog modes) have been tested at track level and also using a digital multimeter. It's great to see curved lane changers working perfectly with my shinny new ARC PRO. All good!

C

Dr_C

297 posts

For this configuration, two cuts is far safer than one. Please see the thread that blagged-01 started under the main ARC PRO subject theme on 'modifying curved lane changers'... additional photo attached here...

Dr_C

297 posts

Just to re-iterate... two cuts is far better than one! Please see photo above noting cuts in front of little mini... and please see more details under blagard-01's thread in the ARC PRO subject area of this forum.

Dr_C

297 posts

And another similar photo... please only use this mod if the exit flipper/wedge is 'fixed' rather than floating type.

Please note the double cut in front of the little mini!

Dr_C

297 posts

Many thanks blagard-01... diagram is perfect!

Hopefully top down photo attached below... underside wiring photo to follow...

Dr_C

297 posts

Hi Josef,

i believe you are misunderstanding where the short circuit is likely to occur. The flipper is not relevant all all. The short circuit will occur on the rail next to the flipper precisely where you put the cut. Your cut is I am sure intended to separate two track signals which are pulling in opposite directions I.e. the full 15V switched signal will be present across the cut line at all times. When the car brush passes over the cut the two sides of the cut line will be ‘bridged’ i.e. a full current serious short circuit. If you don’t believe me, move the car very slowly by hand (no throttle power) across the cut line and watch the ARC PRO go into SAFE mode. You are stressing the system every time you drive over the single cut line. Really not a good idea!

If you are planning two cuts, 10-15mm apart that would be fine - but that’s not what you are showing in the photos, hence my concern.

C

Dr_C

297 posts

Hi all, this modification is moving along the right lines (in my opinion), BUT still absolutely not recommended (in my opinion). This is because at the point of the cut, there will be opposite signal polarities on each side of the cut line. This configuration will result in a short circuit occuring briefly each time a car’s pick-up brush traverses the cut line. Given the power base can provide approv 8 amps of current, this will generate quite a sizeable spark each time. This will be bad for at least two, possibly three, reasons.

1/ it may affect nearby rf comms (sparks are broadband rf noise)

2/ the short circuit which occurs every time will be trying to put the ARC PRO into safe mode albeit briefly each time. This may cause long term damage, or premature failure, of the ARC PRO drive circuits) and worst case senario some blue smoke...

From a design piont of view I would strongly advise against this configuration... albeit that it appears on the surface to work in a satisfactory way in the short term.

If you don’t believe me - briefly try driving cars (with no lights) over the cut line in a darkened room - and watch out for the sparks... the sparks will be generated by 8 amps current at 15 volts...!

C

 

 

 

Dr_C

297 posts

Thanks Blagard-01 for helping with a further diagram image.. I very much appreciate this kind help...

C

Dr_C

297 posts

Hi all, yes, this option C will be fine for up to the maximum number of cars i.e. 6.

This is not a problem because inside the ARC PRO the exact same drive circuit powers both lanes anyway (it’s just that the signal polarities have reversed for other reasons). For 4 or more cars you need two standard PSUs to be plugged in (as per Scalextric instructions).

Just to clarify a point of detail, way back when I first proposed option C, what I had in mind was exactly as per Blagard-01’s above diagram. However more recently I have been proposing an alternative way to implement Option C to achieve an identical ’electrical‘ effect - by simply cross wiring the rails of a single lane at the point where the dead spot is formed. I show this as the point marked X in my earier rough ‘tty‘ diagrams. This keeps the modification effort to one lane only. I know an updated diagram is required to add further clarity and I hope to share this tomorrow along with some nice photos the little red mini in action on curved lane changers!

I hope this helps...

C

Dr_C

297 posts

Above post while slightly ‘of topic’ does contain an interesting metaphor which, for me, brings two important thoughts to mind...

1/ does the sight impaired squirrel find the nuts because it uses all of its other sensory inputs working collectively to help pin point the food?

2/ or does the squirrel live within a ‘caring community‘ which helps ensure those squirrels which have difficulties finding food are supported?

Sorry if this off topic - but it ‘kind-of‘ follows on from the wider scope and perspective introduced in the previous post.

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