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In a positive clamping circuit in the first negative half cycle the capacitor charges then they say it functions as voltage source

I have a doubt the capacitor will discharge eventually then how can it function as a constant voltage supply

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  • \$\begingroup\$ All caps have a T=RC discharge time, so a diode clamp requires periodic refresh or an AC signal to be DC clamped, like TV horizontal sync \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Oct 24 '16 at 6:05
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The capacitor is repeatedly recharged on every negative half-cycle.

It will discharge slowly on each positive half-cycle, so it isn't quite a constant voltage supply.

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