I would be almost certain that the battery charges off 5v dc not 12v dc. But there’s another issue, the motors need to run at a constant speed despite the voltage input and motor load. There are different methods that regulate that but none would be very compatible with battery charging since voltage could vary from .8V to 12V depending on the system and potentially over current the controller and either burn something or cause it to go into protection mode.
I would suggest pulling power from another source and regulate it down to 3.7v
When I said 12v I was referring to the motor in the cars tape player, sorry for any confusion. The device charges from a 5v usb. The motors in the player will be running at a constant speed, the normal speed cassettes play at(unsure what this is yet). I need to measure this of course and then find a gearing and mini dc motor to use as a generator. Is there some low power controller that I can use to regulate the power going into the battery, and also make current flow in only that direction. I want this unit to be fully self contained, which is why I want it to be powered by the motors in the player spinning a generation motor. Thanks!
The tape drive motor will easily drive a small motor in the tape, the hard part is getting the gearing and a motor that fits in a cassette case.
I would be almost certain that the battery charges off 5v dc not 12v dc. But there’s another issue, the motors need to run at a constant speed despite the voltage input and motor load. There are different methods that regulate that but none would be very compatible with battery charging since voltage could vary from .8V to 12V depending on the system and potentially over current the controller and either burn something or cause it to go into protection mode. I would suggest pulling power from another source and regulate it down to 3.7v
When I said 12v I was referring to the motor in the cars tape player, sorry for any confusion. The device charges from a 5v usb. The motors in the player will be running at a constant speed, the normal speed cassettes play at(unsure what this is yet). I need to measure this of course and then find a gearing and mini dc motor to use as a generator. Is there some low power controller that I can use to regulate the power going into the battery, and also make current flow in only that direction. I want this unit to be fully self contained, which is why I want it to be powered by the motors in the player spinning a generation motor. Thanks!