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DIY U-Tube Manometer
Perhaps the Simplest Measuring Instrument After the Calibrated Stick. Pressure. It’s one of those things. You know, the sort of thing you never, ever think too much about. Until one day you run into a problem where it would be really handy to know about it. Obviously pressure gauges exist, and are relatively easy to…
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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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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,…
