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Title: Calculate the efficiency of the circuit? Post by: rkearl27 on Sep 6, 2012 The circuit in Q1 wastes energy ? as heat in R6. An alternative strategy is to use a switching
power supply, sold as being 90% efficient and it is used with no R6, feeding the LED directly. Calculate the efficiency of the circuit in Q1, as the ratio of power delivered to the LED to power wasted. R6 = 527 Ohms Just need to know the basic formula. Any help would be greatly appreciated Thanks Title: Calculate the efficiency of the circuit? Post by: julielpn74 on Sep 6, 2012 The efficiency of a circuit depends no more than just the power supply. In order to properly drive an LED you must have something to regulate the diode current. In order to determine the overall efficiency you need to show us your circuit.
Title: Calculate the efficiency of the circuit? Post by: rkbrookover on Sep 6, 2012 the image A1 here has the answer to your question
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