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Ahem... the "usual" mods a la GRAH1 site and others are adjustable braking (handy for backing off the brakes on a mag or high-motor drag, car), adjustable resistance (usually down from your normal controller. Enables you to not have to press the trigger as far. Helps with more powerful motors).
Another mod is an adjustable choke so that if your're racing on a track with higher voltage than you're used to then you can turn the supply down via your controller and hence retain driveability.
Yea, verily! Sir Inte of Tweek doth spake the truth. But... is it that new fangled idea of.....science? Or be it witchery?!! Aye, the people must decideth, for it is unto themselves to choose their own paths....
Just went through Chris Fosts and Grah´s websites once more and they´re describing how your regular controller works. You have your variable resistor, transistorized or PWM(electronic) controller. These controllers don´t increase track voltage. Max voltage available to a car is the same as voltage supplied for the controller.
Slot-Tech may be a different story. They say that their controller has:
"Full Power Boost, enables extra power to be fed to the motor at full throttle (Over and above the tracks standard power output)."
This propably means that there is a switch mode power supply inside their controller. This power supply increases the voltage supplied to the car. You could have say, 16-20V power boost even though track nominal voltage is 12V.
Julius the slot -tech controller has an external capacitor and will only give a boost on un regulated psu's the main advantage to fitting a capacitor is smoothing ,it helps the motor run cool and levels off the power ,Some years ago I used to sell super charger chips through Pendle slot these were merely an electrolitic capacitor in a small package which when placed across the motor connections gave a small boost to the car ,quite effective to the scx motors and the s cans we ran back then.
JohnP, I agree - has to be more that just a cap. Everything indicates towards electrical power boost circuitry. But, we´re just quessing here. If someone is able to provide good pictures of this black box contents we can tell more.
Julius believe me there is no power boost in the slot -tech controler other than the cap .The only difference between the circuit I have on my site and the way jim makes his controler is that jim steps his variable resistance up ,mine reduces,the use of external power sources was banned in the uk over 30 yrs ago and the only power source to be used is the tracks own supply . there are a lot of other ways to go fast before you need to increase voltage ,the main reasonI introduced caps into our controllers was purely to safeguard he motors when we raced on un smoothed psu's the boost gained is merely a bi product , The only time I use the cap is when I race at wrexham or north staffs where they use stock scaley psu's .Wrexham have now replaced there psu with a full wave rectified & smoothed one so the cap is now useless there but the motors will now run cooler.
GRAH1, I really would like to believe that it´s just a cap, but Slot-Tech sales speach indicates that "Full Power Boost feature enables extra power over and above tracks standard power output". You can not achieve this just with capacitor. Other sentence that suggests existence of electronic booster is: "This feature will only work with mains transformer power supplies". Why would filtering capacitor care which supply is feeding it? BUT if you have built-in booster circuitry it would need extra power for stepping up the voltage, thus giving extra boost and "speed increase of 3000-4000rpm depending on the type of motor used". Also such rpm increase is impossible to achieve with plain filtering capacitor.
Okay, I may be wrong, but either the sales speach is extremely exaggerated or controller really has some sort of built-in power boost electronics.
Owners of Slot-Tech controller can confirm or decline. If you find an IC chip and an inductor next to the IC inside controller/box, that means booster circuit exists If there are no extra IC´s or prined circuit boards inside, then I´m wrong and my apologies to Slot-Tech.
julius just get a 1000 mf electrolitic cap 25 v rated and put it across a scaley psu see for you self , there is no magic chip inside a slot - tech controller , all it does is smooth the psu if you dont believe me buy one in sure jim would thank you for the money.I have been building electronic controllers for 35 yrs trust me on this one . Currently the slot tech controler come with the ninco plug in which is just a cap in a box.The purpose of a capacitor in a regulated power supply is to smooth out the dc giving an even supply if say you have an un smoothed supply the cap will level it out a couple of volts higher than its original out put, with a low amp motor such asthe ones we use you will feel a difference in performance , on the higher powered stuff i,e super 16ds and cobalt motors its not as noticable as the amperage that these motors require is not there in a small transformer such as supplied by scaley /carrera / scx etc. Jims claims for his controller are not by any means exagerated or misleading ask any one who has one its just a well put together brake and resistance box with an aditional capacitor for smoothing nothing more nothing less . I think you are unintentionaly reading more into the sales pitch than was intended .The use of booster circuits in the real sense of the word is not in my opinion a good path to follow I have seen batterys used for this and it is quite easy to achieve a serious boost by going down his path , but most of the dc voltage doubler ics on the market only supply milli amps and will probably only reduce the performance of your motor as the current is simply not available to run them ,your money would be better spent on a car which handles well your lap times will be better with a drivable car rather than something which attains warp speed and then cant stop.
Read my april 1st article on the field effect car youll probably want one of those too
It's my guess that some sort of inductance is involve. Power (watts = volts x amps) can be chaneled in a couple of ways. A power supply will supply, 13 volts at 1 amp. Neither the motor or the power supply have the ability to change either of these demands when running direct.
An inductance or mini transformer with the aid of capacitors are able to step up the volts at the cost of amps. As we know, volts is mainly responsible for revs and amps is mainly responsible for torque in a DC motor, now, most modern RTR slot cars don't use the full amperage available to them ie. 300 to 500 milliamps on average. It is feasable to trade off some of the amps for extra volts via an inductance, therefore you can get better than supply volts at reduced amps!
You can achieve a greater voltage with a reduced current therefore giving your motor a VOLTS fix and a few more revs with out it crossing the current limit.
Power supply 13 volts at 1 amp (usually unregulated) is 13 watts
13 volts x 1 amp = 13 watts
15 volts x 0.866 amp = 13 watts
17 volts x 0.764 amp = 13 watts
Get the picture, there is some loss due to circuitry and components but the rest is fact. Club captains should decide if the extra volts are legal seeing as the playing field is supposed to be level!! or will we be bringing our own cars, controllers AND power supplies in the future!!
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