Invisible infrared pulsed laser
Posted on Mar 1, 2013 9439
The device generates an adjustable frequency of low to medium powered IR pulses of invisible energy and must be treated with care. The portable battery pack is stepped up to 200 to 300 volts by the inverter circuit consisting of Ql, Q2, and Tl. Ql conducts until saturated, at which time, the base no longer can sustain it in an `on` state and Ql turns `off,` causing the magnetic field in its collector winding to collapse thus producing a voltage or proper phase in the base drive winding that turns on Q2 until saturated, repeating the above sequence of events in an `on/off` action. The diodes connected at the bases provide a return path for the base drive current.
The stepped up squarewave voltage on the secondary of Tl is rectified and integrated on C2.