3 ms·
Low ESR only matters for PWM filtering capacitors, such as those found in monitor backlight drivers and some switching power supplies’ secondary circuits. It i
by eurasiantiger 5y ago
Low ESR only matters for PWM filtering capacitors, such as those found in monitor backlight drivers and some switching power supplies’ secondary circuits.
It is not necessary to use such capacitors on the primary side, i.e. when the large capacitor nearest to the mains input dies, just replace it with a normal electrolytic capacitor that matches or exceeds the original’s voltage rating and closely matches its capacity.
- klodolph 5y agoWorse yet, sometimes the circuit won't work with a low-ESR capacitor. For example, you can't put a low-ESR capacitor on the output of an LM1117, it will oscillate.
- eurasiantiger 5y agoIn a pinch, that could be compensated with a resistor, a few ohms would suffice… :)