Posts

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  DIY shunt resistor for current measurement – how accurate is it?

  Oct 31, 2026

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  by

  Andrew

  in Builds, DIY

  I needed a shunt to measure current, but only had two 0.082 Ω, 3W resistors. Luckily, I found them in a scrapped PSU. Two resistors in parallel: 0.082 Ω || 0.082 Ω = 0.041 Ω, 6W total But how accurate is the result? And does it matter if the voltmeter connects through sense terminals about…

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  Electronics Component Inventory for Hobbyists

  Oct 31, 2026

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  by

  Andrew

  in Uncategorised

  We’ve all been there. You know you have the component. You just don’t know where. And suddenly you’re thinking: “Maybe I need an inventory system.” – But do you? * A spreadsheet may be enough. * A local application may be enough. * A dedicated inventory system may be worth it. * Or maybe you…

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  No signal generator? – Build a variable astable multivibrator

  Oct 31, 2026

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  by

  Andrew

  in Builds, DIY, Schematic

  This one is intended to provide the ~20 kHz switching signal for our future buck converter. The AMV (astable multivibrator) gives us the signal, but we’re not quite ready to drive the MOSFET yet. We still need a gate driver between the AMV and the MOSFET to turn the 6 V logic-level signal into a…