I have a home-made thingy that I would like to use as a lightning in my living room. It contains `7*4=28` LEDs (red, `1.86V`, `20mA`), originally in 7 groups by 4, each switched on seperately, powered by `12VDC`.

Now, I would like to power the whole thing by `220VAC`. I thought of using a simple stabilizer as on the following schematic:

![schematic](https://i.stack.imgur.com/7qUAk.png)

[simulate this circuit](/plugins/schematics?image=http%3a%2f%2fi.stack.imgur.com%2f7qUAk.png) – Schematic created using [CircuitLab](https://www.circuitlab.com/)

If the stabilizer were optimal, I would get `(220-28*1.86) / 8.2k = 20.4mA`, which is fine for 20mA diodes I think. However, I have some issues:

1. Is my idea of ACDC converter correct? I have a bad feeling that the capacitor is somehow the 1st thing in the circuit and that it's not correct.
2. How well the signal is stabilized by such layout? Especially at the beginning, there might be high currents through the bridge, can't there?
3. Can I rely on the LEDs having moreorless correct voltage drop? It seems that `0.1V` per LED would make a little difference in the current so I think it should be safe, but I'm not sure.