BUY HP4100 https://www.utsource.net/itm/p/1705834.html
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Description: HP4100 is a dual operational amplifier integrated circuit (IC) manufactured by Harris Semiconductor. Features: Low power consumption High gain Low input bias current Low offset voltage High common-mode rejection ratio High output current Wide operating temperature range Applications: Signal conditioning Active filters Instrumentation amplifiers Audio preamplifiers Voltage followers Voltage regulators (For reference only)