SlotForum banner

High Power variable voltage mod for C7042 APB

91119 Views 306 Replies 59 Participants Last post by  Gavin84
How would you like SH type power, the ability to adjust voltage all for next to nothing? Yes? Well read on!

You need
Craft knife
Soldering iron
solder sucker
2x R010 resistors

Difficulty level 2/10 easy enough for teenagers or adults.

Stage one, remove power connector, bend up a leg and refit.

Use solder sucker to remove solder.

Be careful there is a small track on the connector side. If it breaks just use a wire to link from the diode to the side leg.
Prise connector up when all solder has gone

bend up the end leg

Solder back onto board with remaing two legs and solder a thick wire to the bent up leg. Feed wire through 5 volt regulator hole as shown

Stage 2, cut track and solder wire to it
flip board over and with the craft knife cut through the large track shown, cut back and forth until it is cleanly cut. Check with a meter if you have one

Scrape off some of the green stuff and tin the track with some solder. Now solder the wire to the track

Stage 3, add two resistors to double the current trip point
Identify the two resistors R010 in the centre of this photo. Add extra solder either end as shown.

Now solder your new R010 resistors (size 2512) directly on top.

Use a standard C7024 power supply for the untouched connector (this powers the computer)
Use a 0-15V 20-30 Amp power supply for the modified connector (this goes to the power section)

See less See more
  • Like
Reactions: 1
21 - 40 of 307 Posts
hahaha, sure can. Retail PLUS 10% for me!!!
QUOTE (RikoRocket @ 27 Jun 2011, 23:29) <{POST_SNAPBACK}>Finally with the new resistors in place


I cannot see any difference! Do you see a difference? I see the R010 pieces but where is the added resistor? Is is parallel to the R010 resistors?

Must be my old eyes failing me or ....?

Sorry for the rant... but I don't think this is a 2/10 mod if you have poor eyesight.

See less See more
They're piggy-backed/stacked on top. In the first pic you can see the old ones labeled R010. In the second one you can see they're a little messier, and have a R01F printed on them.
I can see what is being done, but I'm not sure I'd be capable of doing it. I might just have to send away for it if I can't muster the courage to try it myself. ;-)
QUOTE (MrFlippant @ 28 Jun 2011, 19:24) <{POST_SNAPBACK}>you can see they're a little messier,
it was a little tricky getting the soldering iron onto them
See less See more
Thanks, Mr. F.

Could not see the forest for the trees in this case.

I might pass on this too.... rather than ruin an APB....

There are so many mods coming right now.... In-Car Pro. etc. .... it may be worthwhile letting the dust settle first.

See less See more
It is easily reversed if you want to put the APB back to standard.

Let the dust settle? Too many mods? I thought people wanted this one...
See less See more
Trust me, Colin, "a little messier" is a compliment, and a comparison only to the machine mounted components. I know how hard it is to get an iron in such tight spaces. I'd probably burn a hole through something important if I tried.
I was only trying to get Gordon to notice the difference.

Your skill in performing the mod is why I'd suggest other people send theirs off rather than risk it.

The good news is that few people will need this, as the APB is head and shoulders above the old 6 car base where power is concerned. This would be for people who really push those limits regularly. I'm thinking people running 6 gmyers upgraded chips in high speed, high downforce cars. ;-)
See less See more
QUOTE (MrFlippant @ 29 Jun 2011, 13:23) <{POST_SNAPBACK}>This would be for people who really push those limits regularly.

Looking forward to pushing as hard as I can
See less See more
Nice work Riko just what i needed for my big cars although i will feel a bit sad replacing the pbpro simple h as its done such a great job. put it away for a breakdown day maybe,
Now wheres my soldering iron.
QUOTE (RikoRocket @ 28 Jun 2011, 16:55) <{POST_SNAPBACK}>It is easily reversed if you want to put the APB back to standard.

Let the dust settle? Too many mods? I thought people wanted this one...

Ha, ha...

You have not read my quotation at the bottom of my signature... I am still in design mode with a myriad of other "projects" standing between me and working on the track.

Don't be mistaken... this progress is great... but I am still catching up with the last round of mods BEFORE the APB came out.

I will probably do like Mr. F. and buy an APB mainly for the dual analogue feature. Still have to make the most of my C7030 PB-Pro + S-H (another piece of excellent work by you guys).

See less See more
Hey, you can get dual lane analogue with PB-Pro SH, you just need a relay and a few wires... I did a thread somewhere.
I've got 8 spare resistors so the Riko APB+ service is open
I have a list of


so thats 8 resistors so the list is now officially shut
See less See more
QUOTE (RikoRocket @ 29 Jun 2011, 02:05) <{POST_SNAPBACK}>Hey, you can get dual lane analogue with PB-Pro SH, you just need a relay and a few wires... I did a thread somewhere.

I had thought of that but then "what if I mess it up?" I have downloaded the thread for future reference. Is it also a 2/10 in difficulty?

If I knew about this mod before I got RichG (or was it you) to upgrade it for me, I would have had it done before shipping. But....

OK, maybe I should stop whinging (sp?) and get on with it.

Back to your wonderful mods.... and back to my "projects" (as initiated by myself or SWMBO) which are a higher priority to my slot track.

Oh ya, then there is the mandatory vacation ....

See less See more
No its not easy, it involves soldering to the ends of tiny surface mount resistors. You have to have a fine tipped soldering iron and good eyes (or a jewellers eyeglass like me)
OK, close up of the track replacement. Wire runs from the end of the diode by the connector to the middle leg of the connector. Easy!
See less See more
Is this photo of the other side of that wire?
See less See more
Hi Riko,
Thanks for the offer to do this. I'd just like to confirm before I go ahead, as I don't have a variable power supply at the moment, that I can continue to use 2 scalextric PSUs until I get one?
It is NOT worthwhile doing unless you have a big power supply and/or variable one.

This mod separates the power section, so where before you had both PSUs feeding it now you only have one, but of course without the limitations of before

So don't do it and just use C7024's, as you will only get half the current.

Yes, Mr F that is the other side of the wire, the photo is not brilliant but essentially I added solder onto the exposed leg of the connector, and soldered the small wire to it.
I'll take that back, if you do this mod and use a standard psu tyou will get more speed as the power goes unchecked to the rails, compared to a standard APB it is +2 Volts! So you can more for less. Super! Super Advanced Power Base! SAPB
See less See more
21 - 40 of 307 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.