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 ...

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.

If an LED shorts, the string’s FET absorbs the additional voltage and subsequent power dissipation. This circuit can safely handle two shorted LEDs (for red LEDs with Vf = 2.1V) and still maintain ...

Both parallel and in-series connections provide zener-diode-voltage measurement at two current values. In some cases, I ZEN values may not fit the equation I ZEN −I ZENMIN <I ZEN <I ZEN −I ZENMAX, and ...

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.

1. Gather your kit You'll need LEDs for surface-mount technology -- the small components you see on circuit boards -- to lie flat against your page. And get a power supply too: "Coin cell ...

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 ...