This is the schematic of an electronic ballast model 234SLESW designed for running a pair of 4 foot T8 or T12 fluorescent bulbs. It claims to have an Energy Star rating when used with F32T8 bulbs. I picked one of these out of a dumpster and it was broken so I had to draw up a schematic. I figured I'd share it with you. It should be fairly easy to construct if you needed a light, efficient, flicker free ballast for your shop or garage or heck, even your living room!
WARNING: This circuit is AC line powered and contains voltages and currents which can KILL if you are not careful. Charged capacitors will SURPRISE YOU! They can hold a lethal charge for hours! If you don't know much about working with line (and higher) voltages or if you aren't crazy (like me) then DO NOT attempt to construct this circuit. I CANNOT BE RESPONSIBLE if you electrocute yourself to death! That said, let's have some fun!
Parts List
R1, R6 470K Non-Flameproof
R2 22R
R3, R5 1R
R4 30R
R7, R9 30R 1/4W
R8, R10 22R
R11 47R 1/4W
CO1, C7, C8 470n, 250V
C1, C4, C5 100n 63V
C2, C3 47u, 250V
C6 2n2
C9 - 12 33n, 630V
C14 3n3, 2KV Ceramic disc
L1 See Notes
L2 See Notes
L3 See Notes
T1 See Notes
D1 - D5 1N4007
Q1, Q2 PHE13005
Q3, Q4 SS8050
DIAC 32V, DB3
RV 270V 10% Zinc Oxide Varistor ZOV-07D271K
F1 2.5A
All resistors 1/2 Watt and flameproof unless otherwise specified. All capacitors polyester unless otherwise specified.
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