Simple 1.5v to 9v step up dc converter circuit using TL496
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DC-DC Step Down Buck Converter Power Supply Module 24V 12V 9V to 5V 5A 25W
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Amazon.com: UCTRONICS DC 6V 9V 12V 24V to DC 5V 5A Buck Converter Module, 9-36V Step Down to USB 5V Transformer Dual Output Voltage Regulator Board [2 Pack] : Electronics
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DC to DC Converter 9v to 5v using IC 7805 | 5v from 9v Battery using 7805 Voltage Regulator IC - YouTube