Educational and experimental PCB designs for Raspberry pi related products and peripherals
This is a hardware PWM output generator. This will give you a fixed frequency, variable duty-cycle PWM signal without using a microcontroller. This uses a 555-timer in astable oscillation mode that provides a 5% - 100% duty cycle. This allows you to control small motors and dim LED lights (see ap5726-lcd-backlight-driver).
This is a breakout board for testing the AP5726 white-LED driver (used for driving 5-7in LCD screen modules). This DC-DC converter is specifically designed to drive LEDs in series while supplying a constant 40mA current and up to 35V.
This is an experiment to mount an AS01808AO micro speaker to a PCB and have 3d printed enclosure parts bolted on. It works surprisingly well.
This is a project to use the new ATTiny series microcontroller to make an I2C controlled PWM signal that can be varied by frequency and duty cycle.
This is a design for a Class D speaker amplifier based on a product by Adafruit.
The usb hub design uses an FE1.1s integrated USB 2.0 controller with the board layout heavily referenced from Retrocution. Many thanks to Retrocution!