cmer Posted May 12, 2004 Report Share Posted May 12, 2004 I need an LED flasher circuit. I need to connect 3 LEDs in series with a 5 volts supply. thanks. Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 13, 2004 Report Share Posted May 13, 2004 Cmer,What kind of LEDs and why must they be in series?If they are common red LEDs, and they have a voltage of 1.8V each, then you must use a DC to DC converter to step-up the 5V so that they will have 5.4V across them plus more voltage for a transistor or IC current-limited switch. Other colours and types of LEDs will need even more voltage.However if they are in parallel, each having a current-limiting resistor, then they will flash when driven by a 5V oscillator such as a 555. Even white LEDs can be driven this way. Quote Link to comment Share on other sites More sharing options...
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