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6502 Minimal Development Board
A Minimalist First Step Into Complex 6502 System Design. I’ve had a serious interest in computer hardware since high school. In between attempts to design my own CPU, I also took some interest in the 6502 shortly after finding Veronica. I promptly ordered two R65C02s- and did nothing with them. Keep in mind this was…
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Simple Power: A Minimalist Adjustable Power Supply
A Simple Power Supply for When you Don’t Need all the Bells and Whistles. Having a bench supply? That’s great. Moving it around? Well, it’s called a bench supply for a reason. There’s definitely a niche for a small power supply you can carry from place to place. I’m not pushing the boat out too…
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Discrete PS/2 Keyboard Interface
Type Like it’s 1987: a Hardware Driven PS/2 Interface. In 1987 IBM released the PS/2 keyboard, an update of the earlier IBM AT keyboard with a smaller connector, extra features, and support for a mouse using the same connector and protocol. This rapidly became the standard for PC compatibles. You’ll still find PS/2 ports on…
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20V 2A Linear Bench Power Supply
A classic project with ample utility.
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Simple Load: A Low-cost, Medium Power Test Load
Building a Constant Current Load for Power Supply Testing. Usually when we talk about “power” we refer to a power source, e.g. “battery power”, “mains power”, etc. Sometimes though, its more useful to refer to what’s using the power: the load. Having a controllable load is particularly useful when designing a power source. You can,…