I'm trying to connect little 3v LEDs to a motorcycle's alternator and i want to regulate the voltage of it to 3 volts so the LEDs don't burn up the alternator gives off 2.5 volts and over with 3 amps and over i can't get my hands on a better regulator, and i have LF33CVs how can i boost the possible current load? i know i can't connect them in parallel but the datasheet doesn't give a sample circuit thanks
\$\begingroup\$
\$\endgroup\$
15
-
2\$\begingroup\$ 2.5 volts sounds fine. Do you actually mean 12.5 volts? It's unclear why you want to boost the output current of a voltage regulator. \$\endgroup\$– Andy akaCommented Sep 14, 2020 at 16:50
-
\$\begingroup\$ no its an old motorcycle the alternator gives 2.5 volts at ideal rpm and goes to over 4 volts at higher rpms \$\endgroup\$– Amir EbrahimnejadCommented Sep 14, 2020 at 16:53
-
\$\begingroup\$ So you want to convert 2.5~4V to 3V for LEDs? LF33CV is 3.3V output as long as input is sufficient \$\endgroup\$– Curious KPCommented Sep 14, 2020 at 16:54
-
\$\begingroup\$ Do you want it to work even at low rpm and 2.5V input available for LF33CV? \$\endgroup\$– Curious KPCommented Sep 14, 2020 at 16:55
-
\$\begingroup\$ i just want to limit the voltage over 3.2-3.3V to that amount, which is the limit of the LEDs \$\endgroup\$– Amir EbrahimnejadCommented Sep 14, 2020 at 16:56
|
Show 10 more comments
2 Answers
0
\$\begingroup\$
\$\endgroup\$
The problem is not the current, it is the voltage. A red led uses ~1V forward voltage at 10mA. Use a 180 Ohm resistor in serie. Good look with your motorbike.
