# Electronic Circuits and Projects Forum

## Regulated DC power supply

1. Originally Posted by Thunderchild
to calculate capacitor value: 20000/(V X I). this is for a full wave rectifier. if u r using a single diode (not this case i know) then double it. naturally u can use higher values but this is the minimum.
This doesnt make any sense to me whatsoever. The units arent even right.
Capacitance is not 1 / Watts.

2. never said it was but that was the formula i was told is there another way to work it out ?
btw what r the output specifications of this thing

3. Eh...not always you have to work it out (unless its that important). Most of the time if you look at your regulator datasheet it will give you a a basic schematic hook up and tell you what kind of capacitor you need. Just make sure the voltage rating is high enough.

4. err rectification on the formula i posted the other day. i have just come across my old note book and found it again and it is NOT 20000/(V X I) but 20000/(V/I) and do not ask why it is not 20000/V/I because i have never tried to verify it is the same but common sense tells me it is :lol

5. Originally Posted by Thunderchild
err rectification on the formula i posted the other day. i have just come across my old note book and found it again and it is NOT 20000/(V X I) but 20000/(V/I) and do not ask why it is not 20000/V/I because i have never tried to verify it is the same but common sense tells me it is :lol
It is still not a capacitance and it has no basis at all. I'm sorry, but unless you can show us by derivation, it is simply wrong. If that's what you have in your notes, scratch it out! :-)

6. wel ys it ould be wrong i mean i read it in a magazine and allhould know that sometimes hey ome out with some weird stuff theor wise ut if my formul i rong then i too now ask: how do you calculate the capacitance needed.
btw the result of myformula should give uF (miro farads) directly.

7. Originally Posted by skyymanz
Hi,

i am concerned for a good regulated dc signal. i have source for the regulator and its quite ok. but wat value of capacitor should i use to minimised the ripple from the output of the amplifier? a value of 1000uF good enough??

cheers!
SKyy
Hi there,
Ya, a capacitor of 1000uF with a voltage rating of 35V will b good enough.

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