bigal_scorpio
Active Member
Hi Guys,
Just wondered if anyone has come across this problem before and can explain it to me?
I recently changed some halogen 10w 12v bulbs in some lighting units for white LEDs (3 per unit + 100r resistor), to keep the running costs down as the lights are used for most of the day and night.
The halogens had the regualar 12v ac SMPS unit so I just fed the output through a bridge rectifier and then put a 3300u cap across the output.
The LEDs worked ok but had an annoying slight flicker (the kind you see out of the corner of your eye with flourescents) so I added another cap in parallel with the 3300, another 2500u and guess what, no flicker now, but a weird throbbing dim to bright effect about 5 seconds peak to peak!
Whats happening, I'm baffled, any suggestions please.
BTW I solved the problem by making up a real transformer supply an now all ok as expected, but I would love to know why I got the effects!
Thanks for looking..............Al
Just wondered if anyone has come across this problem before and can explain it to me?
I recently changed some halogen 10w 12v bulbs in some lighting units for white LEDs (3 per unit + 100r resistor), to keep the running costs down as the lights are used for most of the day and night.
The halogens had the regualar 12v ac SMPS unit so I just fed the output through a bridge rectifier and then put a 3300u cap across the output.
The LEDs worked ok but had an annoying slight flicker (the kind you see out of the corner of your eye with flourescents) so I added another cap in parallel with the 3300, another 2500u and guess what, no flicker now, but a weird throbbing dim to bright effect about 5 seconds peak to peak!
Whats happening, I'm baffled, any suggestions please.
BTW I solved the problem by making up a real transformer supply an now all ok as expected, but I would love to know why I got the effects!
Thanks for looking..............Al