Circuit Ideas: How to Parallel LED Current Drivers. Feb. 21, 2008. ... Because the bases connect together, voltages at the emitters are nearly the same, and therefore R 2 I R2 equals R 1 I R1.

When designing a handheld device with a color display using white LEDs for backlighting, is it better to use parallel or series connected LEDs? Both architectures have their own advantages when you ...

Circuit topologies for connecting LEDs. Erik Ogren looks at the choice between serial and parallel architectures for connecting LEDs. When designing a handheld device with a colour display using white ...

In a parallel circuit, all the LEDs you connect will glow no matter how many you add. That's fine and dandy for a low voltage, battery-powered circuit running a stack of LEDs, but it can present ...

"For LED circuits, you can simply tape the LEDs on to the copper traces to make the connection," explains Qi. "For more complex circuits with many connections, solder your components to the copper ...

So - this is my field. Parallel connections would mean you would have a drive current of perhaps a quarter to half an amp per LED X # of LEDs, all at ~3 volts DC.

A power-limit circuit can be added to the circuit in Fig. 1 to limit the overall power when there is a large voltage variation for parallel strings of LEDs, with the result shown in Fig. 2.

Most commercial LED flashlightsuse three AAA or AA batteriesin series that produce 4.5V. The batteriesthen drive four white LEDs that connectin parallel. These LEDs can workat voltages as low as 2.7V ...

If you remove any part of this circuit (like take out a bulb), everything goes out. If you wanted, you can make a similar circuit with 10 or 20 bulbs. Just connect them all in a line so that the ...

The flashing is thanks to LEDs with a built-in, integrated flashing circuit and the nasty noise comes from a piezoelectric buzzer — both are available from electronics stores that sell ordinary LEDs ...

When a battery is connected, turning the first switch on makes the first LED light up. ... The second video features the same resistor/switches/LEDs, this time in a parallel circuit.