i am uncertain to what kinda transformer to use as i havent know what type of motor have a strong turning power. any fan will do .
where can i learn how to select the right component for my project?please direct/advice me on what to learn…
i am on my final year diploma in E&E engineering i seem to be able to use some theory to make a circuit for this project but if there’s any other way besides using experience to select type of component please advice me …
i tried surfing circuit design… but most lecture videos on circuit design are about microprocessor which is unrelated to this practical project.
if there is a course /book/ video that i need to know to design this circuit please let me know… this project also need to use an ic …perhaps i can use 555 +capacitor+variable resistor to make delay but … if you have any other ideas please share with me…
the condition that my lecturer gave me is that no programming is allowed…
and there will be a question session later on about “the reason why i choose this particular component why not something else?” what should i do so that i can design a practical circuit and answer all their question confidently… if u guys have any suggestion on what i should learn please tell me and i will look it up…
For the motor, I’d look into a stepper motor, or maybe a servo. From what I understand, you probably want more positional control than a typical DC motor affords.
I also second the suggestion to use a commercial “wall wart” power supply (unless that’s against the assignment guidelines). Otherwise, you’d need to build a full power supply, which is more than just a transformer. As an EE, I’d think you should probably have covered PSU design, but if not, the basic stages are line voltage (110VAC) → step-down transformer (~20ish VAC) → rectifier → regulator.
qwertymodo:
As an EE, I’d think you should probably have covered PSU design, but if not, the basic stages are line voltage (110VAC) → step-down transformer (~20ish VAC) → rectifier → regulator.
Just a quick question there from an amateur: why put the rectifier behind the step-down transformer? Is it just for the cost of the components (i.e. you need more heavy-duty diodes for 110VAC than you need for 20VAC), or is there an additional reason behind it?
The transformer doesn’t just step down the voltage, it also isolates the rectifier from the incoming AC, which is necessary for the rectifier to function properly (at least for a bridge rectifier, it needs a closed loop).