Hello, I back again i'd try this circuit because I have project to make homemade cassette player with fast rewiding tape. This circuit will use 78/79XX op-amp ic and two transistors. This is demo circuit untested I wanna someone which is best knowledge with pwm modulation to make explanation it is a good move to put chip as u3842 ic?! I wanna regulate two small motors from cdrom from door at right without plate. I have one normal motor with plate behind extracted by cassette recorder with regulated circuit. He its dirrectly connected after resistor of 470ohm. I chosse itto reduce little voltage cause its for 6v but he had zener diode for division.
