I'm trying to achieve variable speed control on two brushed DC motors powered by a 3s or 4s LiPo battery (~12V or 15V). This is for a nerf blaster I'm modifying, which is why I'm not using a pre-made speed control ie I want control over the shape/layout. I'd like to vary projectile speed with a thumb knob.
I just finished watching ElectricMonkeyBrain's YouTube video on the TL494 PWM chip.
I was initially planning to vary the duty cycle with a potentiometer on the chip's control pin, to get a PWM signal and feed that into a MOSFET. But in the video he mentions that the chip has an integrated over current protection function. Ie the chip will
monitor the voltage across a sense resistor in series with the load
and will
kill the output if the sensed voltage/current goes above a reference voltage
It occured to me that I could actually adjust the reference voltage as a way to control the motor speed.
Would this be a better way to achieve speed control and protect my motors/battery? Or is it a terrible idea altogether.
I agree that the government should govern not politick, but isn't it a bit naive to think you can make lasting change without politicking?
I wonder if it's useful to look at "governing", and "politicking" as either end of a spectrum with "leading" as the sweet spot.
Just my two cents though.