A DIY HiFi Audio Preamp
This is an overhaul of my previous rev 3 preamp. Because the circuit is DC coupled, a reader suggested adding a capacitor or a servo to prevent DC offset voltage at the output. I’d just removed the second-to-last capacitor from the signal path, so I wasn’t about to add one back. The one capacitor that […]
Run a Raspberry Pi from a 12V Supply
Purpose This is a simple, low-cost, adjustable DC-DC converter designed to power a Raspberry Pi from a 12V source. As built, it’s configured for a Raspberry Pi 4B, but with a different output cable it could power any Raspberry Pi 3 or 4 — or other 5V devices — instead. Running at roughly 91% efficiency, […]