A new C64 PSU modernizes the classic Commodore 64’s power delivery, shedding bulky iron-core transformers for a sleek, USB-PD-driven design. Traditionally, powering the iconic Commodore 64 has involved cumbersome power supply units (PSUs) that deliver both 5 VDC and 9 VAC, typically relying on large iron-core transformers to step down mains voltage. However, in an era dominated by compact switching supplies and the ubiquitous USB-PD standard, Side Projects Lab has introduced a groundbreaking alternative: the diminutive PD-64.
The Ingenious Design of the PD-64
The PD-64 is a marvel of modern engineering, designed to be so compact it barely extends beyond the C64’s power port. Its small footprint is largely achieved by offloading significant power conversion tasks to an external USB-PD wall adapter. The unit requests 12 VDC from the USB-PD source, which it then efficiently steps down to the required 5 VDC using a standard buck converter. The most innovative aspect, however, lies in its method for generating the 9 VAC.
To ensure galvanic isolation between the outputs, the 12 VDC input is first chopped into a high-frequency 500 kHz signal. This signal then passes through a tiny 5:6 ferrite transformer, a crucial component in its compact design. The transformer’s output is subsequently rectified to 13.6 VDC. This intermediate voltage is then ingeniously utilized to power a class-D audio amplifier, which precisely generates the 9 V peak-to-peak, zero-DC-offset signal essential for the C64’s operation. This approach significantly reduces the size and weight compared to traditional designs.
Open-Source Innovation and Availability
Side Projects Lab has generously made the design files for the PD-64 available to the community. Enthusiasts can access FreeCAD files for the case and STLs under a BY-CC-ND 4.0 license, along with a comprehensive circuit diagram for the electrical components. For those who prefer a ready-made solution over designing their own PCB, Side Projects Lab plans to offer finished versions of the PD-64 for sale, providing accessibility to this modern power solution for all C64 owners. This commitment to open-source hardware fosters innovation and allows the retro computing community to embrace modern advancements.
“The PD-64 marks a significant leap in retro computing hardware, blending modern power efficiency with the nostalgic charm of the Commodore 64.”
Dragging the C64 into the Modern Era
The development of this advanced C64 PSU modernizes not just the power aspect but aligns with a broader trend of upgrading the Commodore 64 for contemporary use. Last year, Side Projects Lab also introduced an HDMI output hack for the C64, demonstrating a dedication to bringing this iconic computer into the 21st century without sacrificing its original spirit. These innovations allow a new generation of users, alongside long-time enthusiasts, to experience the C64 with enhanced functionality and convenience. For more related Industries news, visit our industries news section.
The PD-64 represents a significant step forward in retro computing, offering a compact, efficient, and modern power solution for the Commodore 64. By embracing USB-PD and innovative power conversion techniques, Side Projects Lab has successfully reimagined a fundamental component, paving the way for further modernization of beloved vintage hardware.
