Electronics
Power Supplies
Op-Amp Based Linear Regulators — This article traces the history of the Sulzer and Jung op-amp based linear regulator designs and comparatively reviews these circuits.
Tangent Easy Power Supply — An above-average LM317 type power supply for DIYers.
TREAD — A simplified version of the rectification and regulation stages of the above supply, compacted down onto a very small and inexpensive circuit board.
Power Supply Parameter Estimator — If you're building one of the power supplies above, this estimator will help you arrive at a sane configuration.
Power Supply Tests — Bench tests of above power supplies, along with several other commercial power supplies for comparison.
Virtual Ground Circuits — Virtual ground circuits create a dual-voltage supply from a single supply. This article describes several circuits that vary in complexity and performance, trading one for the other.
Test Equipment
How to Buy a Multimeter — Advice on selecting a brand, features, and a cost range to fit your needs.
Low Noise Measurement Preamplifier — A switchable 40dB/60dB AC amplifier designed for testing low-voltage signals with test equipment of average sensitivity. It was made for testing output noise of the power supplies mentioned above, which can be down in the μV range.
Op-Amp Tester — A simple go/no-go circuit for testing whether an op-amp is dead or not.
Building a "Smarty" Load — You know what a "dummy load" is, right? Well, this is better.
Miscellaneous
Tangent Tutorials — A growing series of training videos aimed at those getting started in DIY electronics.
ADAPTLE: An SO-8 to TO-92 Adapter for the TLE2426 — Use the SO-8 version of the popular TLE2426 chip when you only have footprint room for the TO-92 version, and get lower noise with this simple little adapter.
DIY Heat Sinks — Several DIY TO-220 heat sinks commpared to a commercial heat sink. How does a penny or paperclip compare?
Electronics Book Reviews — Reviews of my favorite electronics books.
What is a "Breadboard"? — Breadboard, perfboard, plugboard, vectorboard... If you're confused about all these terms, this short article will help clear the fog.