benjamin-owen / amp_pcbv1 Goto Github PK

- H-bridge
	- An H-bridge is made up of four MOSFETs and four diodes.
	- It switches motor direction based on which two MOSFETs are on.
	- The diodes serve to allow reverse current from the motor to be released.
	- The current solution is Adafruit DRV8871.
		- Its current Limit is 3.6 Amps.
		- This is not enough for the brake Linear Actuator.
	- Recommend switching from DRV8871 to MCP1407.
	- Has peak current capability of 6 A, which is enough for the braking actuator.
	- https://ww1.microchip.com/downloads/en/DeviceDoc/20002019C.pdf
		
- Steering PWM
	- A square wave is sent to input A of the servo.
	- The pulse width determines position of servo.
	
- Differential Amplifier 
	- 
	- The formula for a voltage divider is V = VR + (R3/R1)(V1 - V2).
	- The circuit amplifies the difference between the two inputs and adds the voltage VR as an offset.
	- Amplifier for PCB needs to change 0.55 V to 0 V, and  2.75 to 12 volts.
	- Diagram for Reference: https://www.electronicshub.org/wp-content/uploads/2015/01/1.-Differential-amplifier-circuit.jpg
	
- Braking Linear Actuator
	- 5 Amp Max Current Draw at 12 Volts
	- Duty Cycle: 5 minutes on, 15 minutes off
	- Speed of 1.38 in/s with load of 35 lbs
	

	Changes
		-C1, C3, C4 backwards footprints (non-polarized capacitors
		-Resistor footprints larger
		-