3 ms·
What would putting a single cap directly between power and ground be? Wouldn't that be a short circuit or boom?
by Something1234 8y ago
What would putting a single cap directly between power and ground be? Wouldn't that be a short circuit or boom?
- turbinerneiter 8y agoA filter cap. It is in parallel to the actual load and once it's charged, there is not current anymore. It only booms when the voltage is to high. Many chips, like a bluetooth chip, don't draw power continuously, but there are spikes. These spike in current can lead to the voltage dropping to low. A filter cap acts against that. Sometimes, especially in prototyping circuits, where nobody took care of properly designing a power supply, filter caps are the first cheap shot at fixing weird behavior. If you wanna know more, google the term, there is way better explanations then mine, form people with way more profound knowledge.
- roland35 8y agoCapacitors do not conduct any current in steady state but rather conduct more current with higher frequency. The equation is i = C dV/dt So depending on what frequencies you want to filter out you can change the capacitance C.
- marcosdumay 8y agoIt's not a single cap. It's a cap near each power supply pin. People already explained the reasons. I just wanted to add that point.