Fast gear mods

mbartell · #1 01-28-2003, 09:49 AM

I got one of the tyco fast gear cars, and figure that the only big diffrence between it and the audley cars is that it uses a motor for steering instead fo a magnet.
I put in a four cell battery pack from radio shack- it took some dremeling, but it fits under the mini cooper body. It's the four cell that arranges the batterys in a square. I just dremeled off the top of the battery case and pushed it thru. The "frame" is still prety rigid, but I don't want to run it with the body off.

Then, I found out about the relay mod. So the big question is, does anyone have a good circut diagram to show how to hook up the relay mod? I can't use the pre-made kit, because they use 3v relays, and I want to use 6v ones, rated for a high amperage, if I can find them. The 6 pin relays are pretty common, and should have a standard way of hooking up.

I can almost see how they are put together on the canracers site, but I would be more comfortable with a circit diagram to make sure I have the diodes pointing the correct way.

any sugestions or a link?

zclonedude · #2 01-28-2003, 10:10 AM

this might help

mbartell · #3 01-28-2003, 10:26 AM

that's about all I needed. just have to remember to pull the bottom two pins together for the output.

now, to hit up the elecronics store for some mini 6v relays that'll allow some amps to be pulled---
Now I can use ANY motor without worring about frying the controller circut. muhahaha
maby even one of those nice micro RS4 motors--- if they wern't $20

zclonedude · #4 01-28-2003, 10:33 AM

Glad I could help. Please post pics when your done!

mbartell · #5 01-29-2003, 09:04 AM

I was looking at what was avialabl at the Radio shack, and they have 5 pin relays that will take around 2 amps, I think.

I was wondering if the diode was needed. I figure the attachments would be like this:

ground to normally open pin, and - for switch
+(motor lead) to the +for switch
+(direct to battery) to power lead
motor to output lead.

if you do that for both of your motor leads, wouldn't it automatically be - unless the relay is activated?

zclonedude · #6 01-29-2003, 02:18 PM

Now your getting heavy on me man, darn I have to think. You could probably get away without the diodes. But they are put there to stop any voltage or current from reversing and frying the pcb, they are like a oneway check valve. So what the hell put them in to be safe and it will probably make the relay switching smoother anyway.

mbartell · #7 01-30-2003, 08:51 AM

Yeah it's always good to have annother safeguard on anything.

If you didn't put in the diode, the relay might bounce and short too. I kind of forgot that a relay is just a physical switch activated by a magnet.

Off to the good electrnics store tommorow- it's payday!!!!

mbartell · #8 02-04-2003, 09:34 AM

I went to rat-shack and got a pair of relays and hooked them up. It still slows down a bit when you turn the wheels, but it's a little faster over-all.
The neat thing is that I found some 1800mah NiMH AA batteries at Walmart for $10 including a charger.
The other improvement in speed is swapping the stock motor for one from a Tamiya 4wd kit. It has a blue end bell, and I think it's just their stock one.
Still waiting on the pile I ordered from the local hobby shop.