The resistor value can be calculated like this: R (Ω) = (Supply Voltage – LED voltage drop) / I (A) For example we have a 9V battery and a white LED with a typical voltage drop of 3.1V. The desired ...

When a battery was connected, the LEDs were somehow switched on one at a time.The second video featured the same resistor/switches/LEDs, this time in a parallel circuit.

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 ...

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 ...

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.

The circuit in the figure offers a ... When MOSFET (Q1) is turned on, current flows from the input through the LEDs, parallel smoothing capacitor (C2), inductor (L1), Q1, and sense resistor ...

Sometimes the most useful hacks are also the simplest ones. A case in point is the LED and resistor assembly that [Skippy] recently posted on his blog. The idea is to solder up some pre-made indica… ...

When resistors are connected in parallel, the supply current is equal to the sum of the currents through each resistor. The currents in the branches of a parallel circuit add up to the supply current.