ElectroNewby
Member
I have a few simple questions regarding this design we've had in school.
Sorry, haven't touched electronics in a while.
Mostly, it's the caps values I'm interested with. I'd like to know how they came up with the values.
1)
C1
It's an electrolytic 10uF rated 10V.
I know it's to supply a clean and steady voltage to the 7805 but why 10 microfarads ?
And why 10V if the source is 12V ? I would put a 16V there, am I wrong or the voltage drops of the diode/LED/7805 take care of that?
2)
C2
A ceramic/disc 0.1uF (it's written 104 on it). It's some sort of filter I beleive, right...
Why 0.1uF ?
Why not an electrolytic cap ?
What's it's use if I already have a cap to have a clean input (C1) ?
3) with the 1k resistor
(Not couting the voltage drop, but I should) can I "V=RI" the source and output ?
I:12v/1k=12mA and 12V*12mA= 144mW so O:144mW/5V=29mA ?
4) how would you improve it ?
Thanks !
**broken link removed**
Sorry, haven't touched electronics in a while.
Mostly, it's the caps values I'm interested with. I'd like to know how they came up with the values.
1)
C1
It's an electrolytic 10uF rated 10V.
I know it's to supply a clean and steady voltage to the 7805 but why 10 microfarads ?
And why 10V if the source is 12V ? I would put a 16V there, am I wrong or the voltage drops of the diode/LED/7805 take care of that?
2)
C2
A ceramic/disc 0.1uF (it's written 104 on it). It's some sort of filter I beleive, right...
Why 0.1uF ?
Why not an electrolytic cap ?
What's it's use if I already have a cap to have a clean input (C1) ?
3) with the 1k resistor
(Not couting the voltage drop, but I should) can I "V=RI" the source and output ?
I:12v/1k=12mA and 12V*12mA= 144mW so O:144mW/5V=29mA ?
4) how would you improve it ?
Thanks !
**broken link removed**