| |
Powerful transformerless power supply 12V 100 mA.
This circuit is not isolated from 220 VAC! Dangerous HV AC!
Use a class X2 capacitor for C1 and C2 with voltage double the line rating!
180 VAC – 265 VAC input.
Low cost, low component count.
Schematic diagram. Click to enlarge.
PCAD2006 Schematic file. Click to download.
|
|
Part
|
Description
|
Qty.
|
|
|
|
C1, C2
|
0.47 uF 630 V class X2 capacitor
|
2
|
|
|
|
C3
|
1000 uF 25 V electrolytic capacitor
|
1
|
|
|
|
C4
|
1 uF 50 V ceramic capacitor
|
1
|
|
|
|
R1
|
27 Ohm 1 W carbon film resistor
|
1
|
|
|
|
R2
|
1 MOhm 0.125 W carbon film resistor
|
1
|
|
|
|
R3
|
100 Ohm 0.5 W carbon film resistor
|
1
|
|
|
|
VD1, VD2
|
1N4007 diode
|
2
|
|
|
|
VD3
|
12 V 0.5 W Zener diode
|
1
|
|
|
|
VT1
|
BD681 transistor
|
1
|
|
|
|
