How to design Transformerless Power Supply circuit practice and theory 

@Radal 05
This video explains practically and theoretically transformerless 220Vac to 5Vdc..12Vdc and others
00:10 All kinds of led bulbs
02:17 3W bulb output voltage test
03:08 3W . bulb output current test
04:16 Schematic transformerless
06:26 Transformerless current large formula
10:00 How to add zener to transformerless
10:37 Test transformerless 5V
Transformerless Power Supplay 220Vac to 1 - 216Vdc Creative Idea DIY Transformerless Formula
• Transformerless Power ...
A power supply without a transformer is actually a power supply circuit without a transformer which is the basic circuit in a led bulb.
Transformerless formula when viewed is a little complicated, but with the help of a little practice hopefully you can understand it faster.
transformerless power supply calculator, the main calculation in this circuit is to calculate the maximum current, because basically transformerless is a current source.
transformerless inverter, of course this serves as a voltage reducer from 220Vac to the dc voltage you want.
transformerless power supply 12v 5a, to make this the only way is to parallel all the basic components in making transformerless. Especially the bleeder capacitor.
transformerless 12v, you just need to add a zener to produce a 12V output voltage.
9v transformerless power supply, for a 9V voltage, just use the zener as large as the voltage we want.
transformerless 5v, in this video I'm an example of transformerless from 220Vac to 5V, you can see.
transformerless power supply for relay, the use of transformeress to activate the relay, the principle is the same. If you use a 5V relay, then use a 5V transformerless.

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