so i wanted to reduce the speed of my water pump but i feared that the 7-8V might be to low to start it up. So i thought starting it at 12V and then switching it to 7-8V should do the trick. Main question will this wiring work? I am a complete novice and rarely solder or wire things.
My main concern is that once i fire it up at 12V the 0V going to the Step Down controller might damage or even fry it somehow. Also will a regular pc power supply be okay with this.
I deliberatly picked a step down controller because i did not want to use a PWM as i hear all bad thing about using with my pump. I also thought if there was a way to maybe switch automaticaly after 5-10 secounds have passed but i could not find any lead to how to do that.
If anyone has better ideas i am open to change everything about it.
Step down converter is rated for 75W. The chip seems to be a xl4015e. The pump is rated for 18 Watts at 12V but heard that at the start-up it can be more (30W?).
Thanks in advance!