Relaxation breathing technique works especially when you are under stress because when you do such thing, your system will be given enough air to circulate all you body system, making them to work...
The operation of the circuit is as follows: C1 charges through R1 until the voltage across it reaches the peak point. The emitter current then rises rapidly, discharging C1 through the base 1 region...
in this circuit a capactor charges until the stand off voltage of the ujt is reached and the ujt shuts off causing the capactor to discharge. The time is controlled by the RC time constant of the RC...