Smoothing capacitor

Status
Not open for further replies.

Andrew Pollock

New Member
Hi,
I'm using a transformer to lower UK mains electricity from 230Vac (50Hz) to 12Vac. I have got a rectifier (KBPC104) and will be using this to get around 12Vdc.

I would like to implement some smoothing to have a more constant dc supply. My load on the circuit I will be powering will be variable but will not exceed 1A. What value and type of capacitor should I use? How do I work this out for myself in the future.

I attached a drawing to help show my question.
 

Attachments

  • rectifier with zener output voltage regulator.bmp
    53.7 KB · Views: 152
They said a college 1 amp per 1000u as a rough rule of thumb, I'd be inclined to put one in as big as I could fit or want to pay for, do you have any lying around?
 
You need to be FAR more specific about your exact load - and throw away that absolutely appalling diagram, it's worse than useless.
 
Nigel Goodwin said:
You need to be FAR more specific about your exact load - and throw away that absolutely appalling diagram, it's worse than useless.
Click to expand...
Well that appalling diagram is all I have at the moment... But the circuit that I wish to power contains a motor (4.5V to 12V), a high op LEDagain 12V. The motor will be controlled by a pot. I really just need to try and find out the value of the capacitor that might hold the voltage to anything between 10.5V to 11.75V. Still at the ballpark stage here - naturally I will be refining everything as I go along but got to start some where.
 
dr pepper said:
They said a college 1 amp per 1000u as a rough rule of thumb, I'd be inclined to put one in as big as I could fit or want to pay for, do you have any lying around?
Click to expand...
Probably got loads of capacitors that would do the trick - a lot of my design will rely on trial and error. Thanks for the possible answer - ill give it a try and see what happens.
 
Well specify your exact loading and how much ripple you are willing to tolerate and then choose the Farads around that (maybe L-R and some inrush control *IF* it gets large)
 
Status
Not open for further replies.

Similar threads

S
  • Question
Capacitor question
Replies
16
Views
1K
SentinelAeon
S
D
Resistor size for capacitor
Replies
8
Views
2K
Shagreobe
S
  • Question
Continuous, very small reverse voltage on electrolytic capacitor
Replies
7
Views
2K
Tony Stewart
F
  • Question
Capacitor ripple current measurement in SMPS?
Replies
1
Views
2K
transconductance
T
A
  • Question
What Does a Capacitor Do?
Replies
2
Views
4K
JimB
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…