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.
|
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
- T1 is an ordinary 9V 1A transformer connected backwards for step up.
- R1 MUST be 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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