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Reducing Power Dissipation With Dropping Capacitors

A Clever Use of Capacitive Reactance

Reducing Power Dissipation With Dropping Capacitors
Reducing Power Dissipation With Dropping Capacitors
Using dropping resistors connected in series to resistive loads often results in the dissipation of a large amount of energy. If you are working on an AC circuit, the use of dropping capacitors can reduce this to a minimum, and, for a low-power supply, they could be a valid alternative to transformers.

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Materials

Component list

Component List

Please note: the components values of this list are only intended for the circuit and the load specifications indicated in Figure 5. For different purposes, their values will have to be re-calculated accordingly.

 

Capacitors

C1…C6: polymer-aluminum capacitor 220 µF (Kemet A759MY227M1JAAE045) [3]

 

Semiconductors

D1, D2: schottky diode SB150

 

Miscellaneous

X1, X2: screw terminal block, 5.08 mm pitch, 2 pole

F1: 5x20 fuse holder with fuse 2.5 A

 

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