6 to 12 WATT FLUORO INVERTER
This circuit will drive a 40 watt fluoro or two 20-watt tubes in series but with less brightness than
the circuit above and it will take less current.
2 x 20 watt tubes = 900mA to 1.2A and 1 x 20 watt tube 450mA to 900mA depending on pot setting.
The transformer is wound on a ferrite rod 10mm dia and 8cm long.
The wire diameter is fairly critical and our prototype used 0.28mm wire for all the windings.
Do not remove the tube when the circuit is operating as the spikes produced by the transformer will damage the transistor.
The pot will adjust the brightness and vary the current consumption.
Adjust the pot and select the base-bias resistor to get the same current as our prototype.
Heat-sink must be greater than 40sq cm. Use heat-sink compound.
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