shown in fig4 b when the ball contacts a location other than the 34 sweet spot 34 or vibrational node of the bat the voltage of the discharging capacitor is less than the voltage of the second spike of the oscillatory electrical signal when this condition exists the logic state of the output of the amplifier 520 again changes from zero to one causing the q 2 trigger of the two one shots 534 to change to logic one if the logic state change in q 2 occurs while q 1 is at logic one the reset pin rst on the two one shots 540 is activated to prevent a control signal from being supplied to the light emitting diode 542 and speaker 544 thus a response is not produced by the indicating means as shown in fig4 a if the voltage of the discharging capacitor is greater than the voltage of the second spike of the oscillatory electrical signal a control signal will be supplied from the two one shots 540 to the light emitting diode 542 and the speaker 544 to indicate that the 34 sweet spot 34 has been hit the operational amplifier does not change its logic state because the capacitor voltage is greater than the voltage of the second spike thus the q 2 trigger is not activated on the two one shots 534 since the q 1 trigger on the two one shots 534 is still at its logic one state as a result of the first spike the triggers tr1 and tr2 of the two one shots 540 are activated to emit the control signal from q 1.