micro_Amps
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Wow, good stuff,
where can one get one’s hands on one?
If you know what I mean.
:)uAWow, good stuff,
where can one get one’s hands on one?
If you know what I mean.
:)uAYeh its a kitt racer.
Interesting way of selling on ebay for the second one tho. Its a pre-order auction. You pay half, he orders it from OS, you pay the rest and he sends it to you.
He doesnt even have them in his possession!
Instant price mark up and profit for him.
What a smarty.
:)uAYeh its a kitt racer.
Interesting way of selling on ebay for the second one tho. Its a pre-order auction. You pay half, he orders it from OS, you pay the rest and he sends it to you.
He doesnt even have them in his possession!
Instant price mark up and profit for him.
What a smarty.
:)uANah, it was in circuit at the time.:sad:
uA
Edited by – micro_Amps on 16 June 2003 22:36:09
Nah, it was in circuit at the time.:sad:
uA
Edited by – micro_Amps on 16 June 2003 22:36:09
Not yet, I’ve got a few projects on the go at the moment. I’ll throw one in and post the results.
:)uANot yet, I’ve got a few projects on the go at the moment. I’ll throw one in and post the results.
:)uAPh2t, let us know how the modded car compares. I’d be interested to see how the 1.6v gate threshold voltage goes as the battery starts to go flat. Most of the clones have only 0.7v available to the gate to turn the fet on, so unfortunately this fet wouldnt be compatible to mod most clones. Have you found your run time reduced at all because of the higher VGS(th) on this fet?.
Also the 7N03R2 fets RDS(on) stated max. is 28mOHM, the 2502 has a typical RDS(on) of 35mOHM, so they are very close, probably too close to tell a difference, but I’d be interested to know how it handles. They can always be paralleled up to decrease the resistance even further.I have rummaged through my notes and found a few more fets that are suitable, but not as easy to use because they may require extra components, or are not as small as the 2502, or more expensive some up to US$5 each.
They are……
PVN012 optoisolated SSR IC,
GF4410,
GF2304,
SI4410,
ZXMN2A01FTA
:)uAPh2t, let us know how the modded car compares. I’d be interested to see how the 1.6v gate threshold voltage goes as the battery starts to go flat. Most of the clones have only 0.7v available to the gate to turn the fet on, so unfortunately this fet wouldnt be compatible to mod most clones. Have you found your run time reduced at all because of the higher VGS(th) on this fet?.
Also the 7N03R2 fets RDS(on) stated max. is 28mOHM, the 2502 has a typical RDS(on) of 35mOHM, so they are very close, probably too close to tell a difference, but I’d be interested to know how it handles. They can always be paralleled up to decrease the resistance even further.I have rummaged through my notes and found a few more fets that are suitable, but not as easy to use because they may require extra components, or are not as small as the 2502, or more expensive some up to US$5 each.
They are……
PVN012 optoisolated SSR IC,
GF4410,
GF2304,
SI4410,
ZXMN2A01FTA
:)uAMaximan, check your private messages.
:)uAMaximan, check your private messages.
:)uAYeh, I was using those. Thanks Jamie, I might have to reconsider my choice. I might spend a bit more time looking for other options. I may even put a modded booster pcb into a tricell zipzap chassis. The longer wheel base will fit the 3 x 150mAH cells lying down.
:)uAYeh, I was using those. Thanks Jamie, I might have to reconsider my choice. I might spend a bit more time looking for other options. I may even put a modded booster pcb into a tricell zipzap chassis. The longer wheel base will fit the 3 x 150mAH cells lying down.
:)uAThe standard Tx2c/Rx2c chipset combination does have a ‘turbo’ function, but most of the micro cars rx chips are covered in ‘the blob’ making it impossible to get to the pins.
If you wanted a booster Hummer, probably easier to swap a booster circuit board into a hummer chassis.
:)uAThe standard Tx2c/Rx2c chipset combination does have a turbo’ function, but most of the micro cars rx chips are covered in ‘the blob’ making it impossible to get to the pins.
If you wanted a booster Hummer, probably easier to swap a booster circuit board into a hummer chassis.
:)uAQuote:Micro Amps….How did u do the 3.6v internal mod?Jamie, it was 3 x 1.2v cells standing upright in a dremmeled out chassis. It didnt handle real well as the center of gravity is too high. It is in peices again now being rebuilt with 1.2v 40mAH button cells. When its finished it should be 3.6v 80mAH, hopefully when fully charged it will last long enough to be worthwhile.
Ph2t, your circuit is spot on. I have left the resistors out of the circuit because it is more difficult to modify and include them. They are not in the NPN transistors circuit, the are in the PNPs circuit, and the PNP ‘on’ signal circuit is not used, so its not that easy to just leave them in circuit. They are not bypassed, the circuit is left open ended, and not used because the signal is the wrong polarity. The signal to turn both fets on comes from the NPN transistor circuit. If you wanted to drop the gate voltage you could include a couple of smt 220ohm (roughly?) resistors but I havent seen any detrimental effects of slightly saturating these fets in ‘on’ state. The gate current is minute.
Most of the clones gate voltage is around 0.7v , which falls perfectly inbetween the 0.6 to 1.2v range for the 2502 fet gate voltage. Its only the Tomy gear that has 3v from the voltage doubler/regulator.
(I’m not certain that 3v is actually seen at the gate of the fets on a modded Tomy car anyway, must check)
Regarding the link for the other fet mod. I have seen this before. The P channel fet they use has a higher Vds voltage and the car must be a dual cell to have a high enough voltage to run through the P fets. If a complementary 0.6v P channel fet existed that would make the mod a whole lot easier for a single cell mod, but as far as I know, that is not the case.
:)uAThat could be fun. A pursuit Hummer. Might need a GT stripe tho.
:)uAThat could be fun. A pursuit Hummer. Might need a GT stripe tho.
:)uAThanks ph2t, yeh I’m one of those non DivX turkeys.
hehehe, it really does take off.
:DuAThe Jap Perfection 3.8s kick arse. They are strong and fast, a good all round motor for any bit. They are standard bit size, so they suit all the clones as well.
I have some 4.2s on the way, let you know what they are like when I get them.
:)uAQuote:just a question do hard wired motor get more voltage because they are wired straight from the pcb?Talldude, it doesnt really make any difference. The currents are so small that the motor contacts on a standard bit do a good enough job of carrying the motor current. A hard wired motor may have less chance of a ‘contact’ problem, but there wont be any improvement from having a hardwired motor.
Well done on changing the Hummer motor to a 2.6, they need it.
:)uAQuote:just a question do hard wired motor get more voltage because they are wired straight from the pcb?Talldude, it doesnt really make any difference. The currents are so small that the motor contacts on a standard bit do a good enough job of carrying the motor current. A hard wired motor may have less chance of a contact’ problem, but there wont be any improvement from having a hardwired motor.
Well done on changing the Hummer motor to a 2.6, they need it.
:)uAGlad you like them Talldude.
I’m now modding all the clones on the market as well, precious, ShenQuiWe, Lxx, cyclona, hummers, zipzaps, and any others, if you want one done just send me a PM.:)uA
hehehe 🙂
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