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ruzfactor said:hi audioguru,
i'm now using two 9V batteries and using a 7812 for +12V from +18V in the circuit. This +12V is also used in 7806 for +6V supply. Previously I used an adapter for this purpose. How do I resolve this dimming of LED??
ruzfactor said:The voltage which would make the LEDs brighter. Really these LEDs driving me crazy. My LFR is finished and because of LEDs, it's not working properly.
So what do I do now? I used two 9V batteries because it's cheap. A 12V rechargeable battery costs a lot!
ruzfactor said:Should I now increase the voltage to connect the LEDs in series? How about I use 18V(from the battery) for six LEDs with 240ohm?
ruzfactor said:Hi
I don't know the forward voltage drop and also the part number. I can give you a pic of these LEDs. These LEDs emit RED light.
ruzfactor said:connected a LED to +9.6V (adapter) with a 560ohm (don't have a 470ohm) and measured the voltage across the LED which is +1.70V
ruzfactor said:LED's glow in RED when lit. I have six LEDs. Do I Connect Six of them together in series or just 3 of them?
hi,
Connect 3 LED's in series, 3 * 1.7V = 5.1V
Assume a 9V battery, when discharged 7V.
Assume 20mA LED current.
So 7V - 5.1V = 1.9V/0.02 = 100R [if you dont have a 100R a 120R will be OK]
So connect a 100R in series with three LEDs also connected in series.