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LASER Power Supply

2015-03-18 07:17  
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If you have ever worked with lasers, you know how fun and interesting it can be, you also know how expensive it can be. The high voltage power supplies for the laser tubes are often more expensive then the tubes themselves. This supply can be built with commmon parts, most of which you probably already have in your junk box. The secret is the transformer used. It is a common 9V 1A unit, connected backwards for step up.

Please note that some people may have trouble with this supply. This is due to the slight difference in transformers. For more information on LASER power supplies, take a look at Sam Goldwasser's Laser Supply Info Page.




This is the schematic of the laser power supply



Total Qty.
R1110 Ohm 10W Or Greater Resistor 
R21Ballast Resistor, See "Notes" 
D1, D2, D331N4007 Silicon Diode 
C1, C2, C330.1 uF 2000V Capacitor 
T119V 1A Transformer 
S11115V 2A SPST Switch 
MISC1Case, Wire, Binding Posts (for output), Line Cord 



T1 is an ordinary 9V 1A transformer connected backwards for step up.R1MUSTbe installed on a LARGE heatsink. A good heatsink is the metal case the supply is built in.R2 Protects the laser tube from excess current. It should be soldered directly to the anode terminal on the tube. To find R2, start with a 500K 10W resistor and work down until the tube lights and remains stable.If you have trouble with the tube not starting easily, use a longer anode lead that is wrapped around the tube.Depending on the transformer you use, the circuit may or may not work. I cannot guarantee the operation of this circuit. Build at your own risk. Some transformers contain very few secondary windings which will quickly saturate the core and basically act like a direct short. The more secondary windings (that is, primary in this circuit) the better.



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