4 ms·
My university made us use really crappy power supplies and dev boards. Nothing worked unless you first put a large bulk capacitor on the power supply's output,
by lefra 6mo ago
My university made us use really crappy power supplies and dev boards. Nothing worked unless you first put a large bulk capacitor on the power supply's output, and small capacitors close to the components.
Also I got bitten by parasitics in capacitors very early in my career: capacitors of different face value will resonate with each other to effectively kill the decoupling network at a specific frequency (resulting, for me, in an amplifier with a nice hole in its frequency response).
- hilbert42 6mo agoExcellent training, especially the parasitic bit. Trouble is somehow many aren't taught that stuff nowadays.
- baq 6mo agoSounds like an opportunity to build a shenzhen i/o prequel
- hilbert42 6mo agoIncidentally, in my post below on the MIT RadLab series I mention Vol 23. On p183 parasitic oscillation is mentioned. Also, I recall when working in the now defunct RCA prototype lab, one of the main cure-alls for parasitic oscillations was to place a ferrite bead on a transistor lead (between it and the PWA). It often worked wonders.