Speed controller for golf trolley

[redriddick]

Re: Speed controller for golf trolley

Where to start?

[budm]

Re: Speed controller for golf trolley

https://www.badcaps.net/forum/attach...6&d=1548445387
What are the P/N as printed on top of those two IC's?

[R_J]

Re: Speed controller for golf trolley

It looks like the one ic is a LM78L05 regulator and the other one could be a microchip 12C5xx pic ic

[redriddick]

Re: Speed controller for golf trolley

Will check them in a min

[redriddick]

Re: Speed controller for golf trolley

https://www.badcaps.net/forum/attach...6&d=1548445387
What are the P/N as printed on top of those two IC's?

12c671 and 78L05A i think

[R_J]

Re: Speed controller for golf trolley

Have you checked to see if you have 5 volts coming out of the regulator ic?
Where does the speed pot connect and where does the on/off switch connect?

[redriddick]

Re: Speed controller for golf trolley

Have you checked to see if you have 5 volts coming out of the regulator ic?
Where does the speed pot connect and where does the on/off switch connect?

The blue and red wire are where the pot and on off switch are connected.
I will have 're solder the mosfets and relay before I can test for 5v

[R_J]

Re: Speed controller for golf trolley

The way it likely works is 12 volts is applied to the board from the battery, U3 supplies 5 volts to the pic processor. when the switch/pot is activated the pic outputs a pwm signal to Q4 & Q5 then to the output transistors (this is the variable speed signal) then the pic also turns on the relay connecting the transistor output to the motor, driving the motor at whetever the speed pot is set to. The relay is likely also used to provide dynamic braking for the motor
Q7 looks like the relay drive transistor, D3 is protection across the relay coil.

I believe that diode D1? (to220 dual diode?) is likely connected across the motor to protect the output transistors.

[budm]

Re: Speed controller for golf trolley

Post #17 also suggested to test the Voltages, but no data from OP.

[redriddick]

Re: Speed controller for golf trolley

There is 5v to the pic