Converting 9.6V DC Voltage for AVR Oscilloscope

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The project involves building an AVR oscilloscope and seeks to power it with a 9.6V battery pack instead of the required 12V. The schematic indicates that a 9.6V supply can be applied to the 7805 voltage regulator without issues. However, the 12V supply is also used for an 8.1V zener regulator for the op-amp front end, which is too high for the 9.6V input. It is recommended to replace the 8.1V zener with a 6.2V zener and adjust the pot P1 accordingly. This adjustment will ensure proper functionality of the oscilloscope with the lower voltage supply.
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Just a quick glance at the schematic, the 12V DC supply input goes directly to 7805 5V voltage regulator. That means you get apply 9.6V DC supply to it without any problems. The only issue is that 12V is tapped by a 8.1V zener regulator for the op-amp front end. Kind of too high, so I'd replace it with like 6.2V zener and adjust the pot P1.
 

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