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Simple 1.5v to 9v step up dc converter circuit using TL496
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2.5 ft. DC 5-Volt USB to 9-Volt and 12-Volt Step-Up Converter 25-2 with Digital Display Extension Cord (4-Pack) 5T912 - The Home Depot
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9V Step Up Converter hack - CircuitLab
PT5045C 9V 1.25A Step Up Integrated Switching Regulator DC-DC Converter Power Trends
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