C64 USB-C to 1541-II Power Adapter

# Overview The old "power bricks" that supply the 1541-II floppy disk drives with power lose their reliability over time and can then damage the drive through overvoltage. There are definitely newer power supplies to buy or you can build one yourself. However, with the increasing spread of USB-PD power supplies, which can supply different voltages and high currents, it may make more sense to use one of these to power the 1541-II. The 1541-II PowerAdapter makes just that possible. * Project Files (Github): [https://github.com/wagiminator/C64-Collection/tree/master/C64_1541II_PowerAdapter](https://github.com/wagiminator/C64-Collection/tree/master/C64_1541II_PowerAdapter)

 # Hardware ## Schematic  ## CH224K USB-PD Power Receiving Chip The CH224K integrates multiple fast charging protocols such as USB PD3.0/2.0, BC1.2 and other boost fast charging protocols on a single-chip. It features: * 4V to 22V input voltage * PD3.0/2.0, BC1.2 and other fast charging protocols * USB Type-C PD, positive and negative insertion detection and automatic switching * E-Mark simulation, automatically detect VCONN, support 100W power PD request * requested voltage can be dynamically adjusted through a variety of methods * high integration of single chip, simplified peripheral and low cost * built-in over-voltage and over-temperature protection module The CH224K in this application has been set to request 12V from the power supply. ## SD8942 Synchronous Step-Down Converter The SD8942 is a fully integrated, high–efficiency 2A synchronous rectified step-down converter. The SD8942 operates at high efficiency over a wide output current load range. This device offers two operation modes, PWM control and PFM Mode switching control, which allows a high efficiency over the wider range of the load. The SD8942 requires a minimum number of readily available standard external components. It feature: * 4.5V to 16V input voltage * high efficiency: up to 96% * 600kHz frequency operation * 2A output current * no schottky diode required * over current protection * thermal shutdown * inrush current limit and soft start The SD8942 in this application provides the 5V for the disk drive. The SD8942 can be replaced by MT2492. # Building Instructions     # Operating Instructions Use a USB-C power supply that can provide at least 12V/1.5A (18W). Plug the power supply into an outlet. Connect the PowerAdapter to the power supply with a USB-C cable. Wait for the POWER-GOOD LED on the PowerAdapter to light up. Plug the PowerAdapter's 4-pin DIN connector into the 1541-II Floppy Disk Drive and turn it on. # References, Links and Notes 1. [CH224K Datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/ADuM3160.pdf) 2. [SD8942 Datasheet](https://datasheet.lcsc.com/lcsc/1912111437_HI-LINK-HLK-1D0505A_C465411.pdf) 3. [4-Pin DIN Connector](https://aliexpress.com/wholesale?SearchText=4+pin+din+connector) # License  This work is licensed under Creative Commons Attribution-ShareAlike 3.0 Unported License. (http://creativecommons.org/licenses/by-sa/3.0/)