60Hz. I adjusted everything for your purpose 🙂
It should be obvious that this cap shouldn't be replaced by a bigger type in this design, following bigger is better spirit. It's not.
Hmm i don't know... 1) it will wear out the capacitor faster and 2) a regulator will have a predefined ripple rejection ratio. 76dB in the TL783's case which translates to about 1/6400, but still. Series resistance in front of the regulator seems better.
1. Actually no. Ripple current is LESS severe with smaller caps.
2. Note I've employed a CRC filter, not just a small Reservoir cap. This will always be more effective than a series R. Besides pre-filtering, the rather large C2 is also essential to feed the regulator with charge in case of variable loads after the regulator.
2. Note I've employed a CRC filter, not just a small Reservoir cap. This will always be more effective than a series R. Besides pre-filtering, the rather large C2 is also essential to feed the regulator with charge in case of variable loads after the regulator.
Can you elaborate? AFAIK, capacitor ripple current is a product of the ripple voltage. Bigger cap equals smaller ripple voltage (V=It/C + lower ESR) so ripple current goes down.
I wasn't aware of the added filtering before regulation, so stand corrected on point 2.
I wasn't aware of the added filtering before regulation, so stand corrected on point 2.
In that equation I is the DC load current, not the ripple current. Smaller cap means smaller ripple current. Stands to reason since no cap at all would mean no ripple current, not infinite current!
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