Trial -1

I tested the circuit today. However , though the transmitters are working and the circuit is executing as it is designed to, no perceivable Haptic sensation was felt.

Possible Reasons

These are some of the possible reasons that might provide a plausible explanation for the failure.

1. I was unable to procure the MAX44250 20V opamp as earlier described , and hence had to resort 

    to the one I had in possession which was 741- 12 V opamp. Therefore since the murata MA40S4S 

    datasheet states the max voltage to be around 20V(peak to peak) for the transmitters, it might be

    possible  that the voltage after amplification fed to the transmitters, being of 12 V range was 

    insufficient for them to emit waves of SPL(sound pressure level)of required amplitude to be felt.

2. Secondly, the present algorithm is designed to calculate phase delays for a line of transmitters

    rather than for a grid and since atleast 16 transmitters are required for the amplitude pertaining to

    the constructive interference to be large enough to be felt, this was nearly impossible to achieve          
     using a line of 16 transmitters ,since as stated by the murata MA40S4S datasheet,they have a 

    directivity of about 60 degrees and hence get heavily damped towards the lateral direction ,

    therefore by the time the wave from the 16th transmitter reaches the first ,its barely strong enough

    to complement to the interference.

Possible Solutions

1. Firstly , replace the present 741 12V opamp with MAX44250 20V opamp and hence increase the      
    supply voltage to the transmitters.

2. Secondly, implement the algorithm for a grid of transmitters thereby cutting short the distance

    each wave has to travel to the point of convergence thereby ensuring the amplitude does not get 

    damped heavily.