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  1. M

    Don't Use Aluminum Forks with front hub motors!

    I snapped the aluminum drop outs on my forks with an Ebike motor coasting a hill, The forks just dug into the ground, crazy stuff This stuff can be dangerous I only use the steel ones now, but you go to get a new frame, or forks that match to your alum frame. Do these adapters really work?
  2. M

    E bike controller question

    The duty cycle of the PWM will be determined by the throttle signal So this is basically the same as PWM with a 555? the width of the pulse determines the average voltage? Why is the frequency so high?
  3. M

    E bike controller question

    "The duty cycle of the PWM will be determined by the throttle signal." Trying to understand how this works. The throttle is not a POT or it is a POT that controls a voltage signal to a pin on the microcontroller, sort of like controlleing the pulse width of a 555 timer in astable mode? The...
  4. M

    E bike controller question

    @bunya thanks for your very useful information. I need to study up on microcontrollers and eventually might build something. For now, will try to get this controller working. Is there a pin on the microcontroller to put the scope probe to see the PWM output? Do Ebike controllers use the same...
  5. M

    E bike controller question

    The middle one has only 2 legs Its nomen is AIRPAX, seems to be temp control of some kind. The other mosfets have all the same numbers. 3 of the BJTs are back to back config, and it appears their bases are all connected. The bjt on top is a 5551 NPN but the remaing one in the group of 3 is a...
  6. M

    E bike controller question

    So your saying the cpu is connected to the BJTs which are then connected to the gates of the Mosfets that switch the higher current to the motor? Out of curosity, what are the op amps and voltage comparators function? There wasnt any batter connected during the storage, as far as I remember. I...
  7. M

    E bike controller question

    Thanks for your reply. No, this one is for a brushed 600 Watt motor I have had for a long time. The water damaged occured not when it was installed on the bike but in storage. Id like to get it functional; it was a very powerful motor. There are no halls sensors on this motor. I just need to...
  8. M

    E bike controller question

    My controllers is not the brushed type with shunts etc; it seems more simple. There is an op amp and voltage comparator (not sure of their function) the pwm chip and caps and zeeners So you saying the voltage goes to the source to drain of the mosfets, depending which mosfet pair is on? What...
  9. M

    E bike controller question

    I have attached 2 pics for your reference. The bottom pic shows where 2 regular (non power) NPN or PNP transistors used to be. The board got some corrosion, so Im trying to get it back in order. Would you be able to tell from looking at this board what type (pnp or npn) those missing transistors...
  10. M

    E bike controller question

    I have an older Chinese made 36 V brushed controller made by senyuan It has 6 power transistors, a Fairchild PWM microchip and 2 large capacitors, some zenners and a diode, and a couple of small chips, look like 555s but cant tell. One of the caps is leaking, so I will replace it. Its a 63...
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