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Can't find a replacement battery for an old cordless drill? Here's how to adapt a different battery to an old drill giving it a new lease in life.
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How combining resistors affects the overall tolerance of the total resistance.
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Building a simple ESR meter for troubleshooting electrolytic capacitors.
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A Karaoke mixer and amplifier for the iPhone.
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An Excel-based transistor amplifier calculator.
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Lessons learned on the topic of high-speed signal probing, and how to build a high-bandwidth "Lo-Z" probe for very little money.
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A sound mixer for a YouTube-based Karaoke system.
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How to make a cheap panel voltmeter from a dollar-store pedometer.
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How to build a fume extractor for your electronics workbench using an old PC power supply.
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Building a constant current "dummy" load. A useful piece of test gear for any electronics lab.
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