I am looking for one shot pulse output not ac sine wave.assuming the output is AC coupled.
As per one of my friends suggestion-----Using a LM741 is possible, I think one transistor can make it much easier. Controlling pulse amplitude can be made by a "volume control" potentiometer e.g. across the output (5-10 kOhms)
AC coupled pulse output is not a "sine wave". If you want to use simple "power" circuits like shown in your schematics, you will need AC coupling. The transistor in your schematic as well as the 741 will die soon if loaded with your hard load. You should find a two-or four-transistor power buffer bridge to handle your load.I am looking for one shot pulse output not ac sine wave.
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As per one of my friends suggestion-----
The pot in parallel with the load in the first circuit will not give the required variation in pulse amplitude.
The 741 opamp has an output current of ~25mA max; not enough to drive those loads.
Neither circuit has a way of stepping the output level.