Lab sheet // rev A
Almost Analog
Keep one hand in the tangible world
Bench log
- Solder mask clearance you'll measure onceThe gap between copper and mask determines whether your board survives assembly or becomes a bridging lesson. Here's how to spec it without the rework.
- Fasteners that belong in your enclosureThe screw you pick today decides whether you'll open that box again in six months. Choose hardware that respects future-you and the people who inherit your work.
- Fuse selection before the smokeFast-blow versus slow-blow matters when your weekend build decides to pull three times its nominal current. Pick the fuse that protects the board, not your assumptions.
- Encoder quadrature you'll decode without the phase chartIncremental encoders give you direction and distance, but only if you sample both channels correctly. Here's how to wire and poll quadrature without consulting the timing diagram every build.
- UART baud rates that match what you solderedCrystal tolerances and baud-rate math collide in real hardware. Here's how to pick speeds that won't drift into garbage frames.
- Inrush current limiting you won't regret at 3 a.m.Your bench supply clicks off when the project powers up, and suddenly Saturday is a troubleshooting session. A few cents of NTC thermistor or series resistance can save the evening.
- Panel cutouts that won't haunt your next buildDrilling holes in an enclosure shouldn't feel like a gamble. Here's how to mark, measure, and cut panel-mount components so they fit the first time.
- Pull-up resistors that won't lie to your microcontrollerWeak internal pull-ups work until they don't. Here's how to pick external resistors that keep your I²C lines honest and your GPIO reads predictable.
- ADC reference voltage you won't second-guessPick a stable voltage reference once and your analog reads stay honest. Here's how to choose one that survives your bench and your production run.
- Watchdog timers before the mystery rebootYour microcontroller will lock up eventually. A properly configured watchdog catches silent failures before they become field support calls.
- Decoupling caps where the datasheet actually wants themBypass capacitors aren't optional decoration. Place them right or watch your rails bounce when the load steps.
- Wire strippers that won't nick your SaturdayCheap strippers leave nicks that fail months later. Here's how to choose tools that respect the conductor and your schedule.