The Infinite Speed Potentiometer Mod (tm) - Page 2

FMZPLAYER1 · #16 01-07-2003, 11:08 PM

If you put that pot in series with the motor, you could set it real slow, and still have receiver and steering 100%. (only affects motor voltage/current, not main battery voltage)

actofgod · #17 01-08-2003, 05:30 PM

True. I don't imagine anyone would need to go THAT slow, however.

The lack of resistance from the PCB would give you slightly different results than mine, but it shouldn't be anything worth mentioning.

If you had some LED headlights running off the PCB or something, you'd probably want to go that way (pot between PCB and engine) so they'd stay at a constant brightness. Unless you wanted to give them a dimmer switch, heh. They'd probably cut out abruptly below a certain voltage, though.

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As a side note, if you happen to have a Motorworks clone (the one with a motor that turns the steering instead of magnets), I imagine you could install this pot to fine tune the steering speed; less voltage = slower, wider turns; more voltage = faster, sharper turns. That'd be a little step closer to proportional steering. I've never been able to find a MW clone, unfortunately.

furiousbob · #18 01-08-2003, 11:48 PM

wow, this is the first forum where there's actually people who think like me. whenever i posted anything about "pots" on other forums, they'd all call me a pothead. grr. but anyway, great mod, i'm considering layman's 3 cell mod for my thunderbolt and your beautifully thought out pot mod. thanks for all the info! cya

add-on edit: hah, sorta contradicting what i said before, but i'm sorta blurry on the different sorts of pots. would a 25 ohm trim pot work for a 3 cell?

actofgod · #19 01-09-2003, 01:47 PM

Quote:

Originally posted by furiousbob
would a 25 ohm trim pot work for a 3 cell?

Sure thing. Anything close to the 20 ohm range.. just whatever you can find that will still fit between the PCB and the inside top of the car body. Do a test fit before you wire it to be sure.

Kingofjapan · #20 01-12-2003, 01:23 AM

I have many other PCB's from broken clones and other ones from broken bits. Do you think i could use the POT from that if i successfully remove it from the board???

PLEASE LET ME KNOW!!!

FMZPLAYER1 · #21 01-12-2003, 10:54 AM

That's not really a pot on the board, it's an RF tuning coil / inductor. It wouldn't work as a pot, maybe as a wirewound resistor, but that's about it.

Kingofjapan · #22 01-12-2003, 12:18 PM

If it's not a pot, then how come everyone refers it to be one, even questformadness says: POT mod, as one it's main mods. Ah well, i doubt that i will be able to find one here. But i will try, this is worth every penny. thanks FMZplayer

later

Kingofjapan · #23 01-14-2003, 10:30 AM

anyone out there? I am sure someone knows if that POT wannabe on the board is useful otherthan it's use right now. I used one of my boards to make my 2 motor mod, so some of the FETs are removed, perfect donor for the POT.

Please let me know if this will work.

FMZPLAYER1 · #24 01-14-2003, 11:59 PM

I just measured one, and it has very low ohms (0.3 ohms according to my DMM). That was 49Mhz coil, I think the 27Mhz (with more wire on it) would be almost 1 ohm, still not much resistance though. I have rewound coils for different frequencies, and found that the lower the freq. of the coil, means more turns of wire. (did this on Canned Heats/ Auldey).

You could wind up a coil with lots of wire to make a resistor, or even use an old steering coil as a resistor, but that is still just a single fixed resistance. Maybe with a tiny switch, that either shorts across the resistor for full speed, and is left open for low speed. Something like a micro version of a MSC.

Kingofjapan · #25 01-15-2003, 12:05 AM

can i wind up the coils on the pot thingy on the board. if i can, can i use the tuning function similar to the mod mentioned above?
that would kick arse, as well as being cheap, well the cost of the bit board *sniff*

anyhoo, thanks

I'll give it a try when i have some time. Can you send a pic of how you wound the coil?? (FMZplayer)

later

FMZPLAYER1 · #26 01-15-2003, 12:45 AM

My last post might have been a bit confusing, making one think that the wire amount changed with the frequency adjustment when you turn the black core in/out.

The tuning core won't do anything for straight dc voltage, the coil would always be the same resistance with or without the little black core. It only works on RF signals

49Mhz coils are pre-wound with 7 turns of wire and 27Mhz are 12 turn coils. Tuning the core in/out only changes the frequency it will resonate at, maybe down to 45mhz or up to 53mhz at the most, but the coil still has the same turns of wire it started with.

Kingofjapan · #27 01-15-2003, 12:51 AM

thanks for that clarification...

OH MY GOSH!

where in winnipeg do you live?? A buddy and i have started a mini rc club. We hope to have posters up at cellar dwellar soon.

are you at university?

quick! answer the questions..

later

FMZPLAYER1 · #28 01-15-2003, 08:04 AM

Actually I live outside of Winnipeg, in Oakbank (about 15 mins out from Winnipeg).

I'm not in university, though I was at Red River College a few years back.

Though I've been messing with electronic stuff ever since I was 8 years old, when my first RC died, and I decided to dissect the remains to determine the cause of it's demise. Been addicted ever since, I should sign up for AA (alkalines anonymous

)

actofgod · #29 01-15-2003, 10:36 AM

Hmm, never thought of trying to use the tuning coil as a resistor. Doesn't sound like it would work too well though.. not enough resistance and not adjustable like a potentiometer.

Kingofjapan, rather than sacrifice a bit board, you might try some online vendors for a pot if there are none in your area. To my knowledge, allelectronics.com does ship outside the US; check their shipping page or call them to be sure.

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Also, while this fits perfectly with a Fairlady 350Z body, I tried it with a Honda s2000 body and it is a very snug fit. Still works, but double check the fit before gluing the pot to the pcb cover. The s2000 body has very little clearance compared to most bodies I've seen. I imagine if it will work then everything else should too.

Kingofjapan · #30 01-16-2003, 12:14 AM

i found some 100 ohm POTs with 25 turns. Can i use these? I read above that it would only have about 5 turns before it would completely cut off the voltage flow. If I can, oh man, i am going to put that sucker in.

thanks for the tips

and FMZplayer, nice to hear that the people that live out here have similar interests, even tho you are in Oakbank.