LASER Power Supply

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.

   

Schematic

Parts

Part Total Qty. Description Substitutions R1 1 10 Ohm 10W Or Greater Resistor R2 1 Ballast Resistor, See "Notes" D1, D2, D3 3 1N4007 Silicon Diode C1, C2, C3 3 0.1 uF 2000V Capacitor T1 1 9V 1A Transformer S1 1 115V 2A SPST Switch MISC 1 Case, Wire, Binding Posts (for output), Line Cord

Notes

1. T1 is an ordinary 9V 1A transformer connected backwards for step up.
2. R1 MUST be installed on a LARGE heatsink. A good heatsink is the metal case the supply is built in.
3. 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.
4. If you have trouble with the tube not starting easily, use a longer anode lead that is wrapped around the tube.
5. 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.