R
Razzel
- Jan 1, 1970
- 0
I am building a 5v regulated power supply so checked web for schematics
and hints.
1) Discovered that the pre regulator post-bridge capacitor should be
100, 220, 470, 1000, or 2200 uf......???huh?
2) Discovered that I should use a 0.1uf cap before and/or after the
regulator.....???huh?
3) Discovered that I should use either a 1N4007 or 1N4148 diode across
the input to output of the regulator on none???huh?
4) Discovered that i can use an LED across the DC output or never
there....again huh?
5) Some times one uses a 100 uf cap after the regulator or 220 uf, or
....???
I think (#2) the 0.1 cap is to leak any main frequency AC to ground.
I think (#1) that any of these would do but the bigger ones will smooth
better except I seem to recall something about its RC constant can limit
the smoothing.
I have no clue about 3, 4 and 5.
Any help please. Would like to know why the capacitors are used in
their particular location. I have forgotten a lot since grad school.
Ron
and hints.
1) Discovered that the pre regulator post-bridge capacitor should be
100, 220, 470, 1000, or 2200 uf......???huh?
2) Discovered that I should use a 0.1uf cap before and/or after the
regulator.....???huh?
3) Discovered that I should use either a 1N4007 or 1N4148 diode across
the input to output of the regulator on none???huh?
4) Discovered that i can use an LED across the DC output or never
there....again huh?
5) Some times one uses a 100 uf cap after the regulator or 220 uf, or
....???
I think (#2) the 0.1 cap is to leak any main frequency AC to ground.
I think (#1) that any of these would do but the bigger ones will smooth
better except I seem to recall something about its RC constant can limit
the smoothing.
I have no clue about 3, 4 and 5.
Any help please. Would like to know why the capacitors are used in
their particular location. I have forgotten a lot since grad school.
Ron