what can i use instead of this cap?

[navidrct]

hi

in this capacitor power supply i use film cap 2.2 uf for input and its large.i want to have small power supply without transformer.

what can i use instead of this c2 cap?it be cool if i can use smd cap in seri or somthing

i want 3.3 v and 200 mA in output and input is 220 AC .

[Gyro]

A transformer or small smps would be a more sensible replacement because:

1. 200mA is a lot of wasted power - you are pulling a whole 200mA from the mains supply to feed a <1W circuit
2. A 2.2uF X1 rated capacitor (yes, it does need to be X1 rated for safety, you won't find anything in SMD) is going to be large and potentially expensive.
3. A transformer or small SMPS is likely to be smaller.
4. Isolation from the mains supply is always preferable.

Capacitive droppers are certainly widely used, but for lower current supplies, usually at higher voltages so the efficiency is much better that you have here.

[navidrct]

A transformer or small smps would be a more sensible replacement because:

1. 200mA is a lot of wasted power - you are pulling a whole 200mA from the mains supply to feed a <1W circuit
2. A 2.2uF X1 rated capacitor (yes, it does need to be X1 rated for safety, you won't find anything in SMD) is going to be large and potentially expensive.
3. A transformer or small SMPS is likely to be smaller.
4. Isolation from the mains supply is always preferable.

Capacitive droppers are certainly widely used, but for lower current supplies, usually at higher voltages so the efficiency is much better that you have here.

thanks alot that was helpful

[Miyuki]

This is good alternative
https://ac-dc.power.com/products/linkswitch-family/linkswitch-tn/

[tggzzz]

Forget about how a circuit like that works; define all the failure modes first.

Don't forget to be very very very sure that, when (not if) a component malfunctions, that failure cannot harm anybody. I don't particularly care if you harm yourself; that's your business. Harming an "innocent" third party is a different matter.

[navidrct]

Forget about how a circuit like that works; define all the failure modes first.

Don't forget to be very very very sure that, when (not if) a component malfunctions, that failure cannot harm anybody. I don't particularly care if you harm yourself; that's your business. Harming an "innocent" third party is a different matter.

[emoji1]
I'll use it in a plastic case in a lump

Sent from my HTC Desire 820ts using Tapatalk