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There's no such thing as "lossless" anything in electronics, and there's not a single IC that's designed to do what you want.
R1 essentially drops the difference between the Zener diode and the AC mains potential, so it's not going to be efficient for anything except light loads. This introduces a bulky, costly transformer into the design, but it's more efficient than the previous design, and your load can vary quite a bit. As you can see, AC mains voltage is immediately rectified and filtered to produce high voltage DC.
These converters, in general, provide a great amount of efficiency and can also source high-power loads. The 7805 in figure 4 immediately reduces efficiency to under 70% due to very high dropout voltage of regulator. These circuits are so far good enough (taken from the Internet): less components + isolation bonus. I am mildly surprised that while the Non-Isolating Zener Supply was provided, there is no mention of a non-isolating capacitive reactance circuit voltage divider. If the device functions within a narrow current requirement, this can be reasonably efficient. IMO, a MOV (metal-oxide varistor) should be added to all of these designs to protect against line transients. It's very nice to have no external components required (or, at least very few compared to the typical support for a switched mode DC-DC converter IC).
This circuit replaced all 1N4001 rectifiers with 1N5819 Schottky rectifiers and used a low dropout linear regulator AMS1117-5.0.

An LDO with PMOS pass element (AMS1117 used PNP BJT) can have even smaller loss (headroom of a few tens of millivolts from its \$R_{ds(on)}\$) and hence more efficient. Not the answer you're looking for?Browse other questions tagged voltage ac dc converter or ask your own question.
Questo prodotto e un alimentatore 5V con presa a muro e con collegamento USB di alta qualita.
Puo essere utilizzato come batteria per Arduino o caricatore per qualsiasi dispositivo USB, come telefoni cellulari, Iphone, Ipad e Tablet. Questo prodotto inolte e ottimo per la maggior parte dei progetti che non richiedono piu di 1A di corrente.
Questo adattatore e stato testato con cura e fornisce sempre 5V stabili senza margini di rumore.
E' compatibile inoltre con la maggior parte delle schede Arduino come Arduino Mega, Romeo, Arduino Duemilanove. Le informazioni riportate su robot-domestici.it possono essere soggette a modifiche senza preavviso, alcune immagini sono a titolo indicativo.
Also, your load can't change dramatically, as the resistor has to be sized to provide enough current to the zener to cause it to reverse avalanche, without providing too much current. These work on the principle of first converting AC to DC, then switching the DC at very high frequencies to make optimal use of the transformer's characteristics, as well as minimize the size (and loss) of the filter network on the secondary. The Power Integrations device switches this voltage rapidly across the transformer's primary side.
These are the sorts of supplies you see in everything from tiny cell phone chargers to laptop and desktop computer power supplies.
You still have to give it some headroom to cover mains voltage variations, the diodes also mean a 30 % efficiency loss.

Due to package variations from suppliers, the product packaging customers receive may be different from the images displayed.
Its wide 2.7V to 40V input and output voltage ranges make it well suited to a wide variety of automotive and industrial applications.
I want to connect my microcontroller to an ordinary electrical socket and I don't have enough space available.
When you use bulk rates, a flat $1.70 registered air mail fee will automatically be added to your cart to ensure delivery of package. I certainly loved that the Raspberry Pi had the feature of 5v 2000m an output to offer efficient power supply for your raspberry pi. A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes. While BulkRate's intention is to offer cheaper prices when you buy in bulk, because it is priced separately it on occassions show a higher than retail price. This is because high-frequency AC requires much smaller components to filter than line-frequency AC. For more information on this Raspberry Pi equipment, check out our partners via the add to shopping cart button on this site.

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