Fuel Gauge (CB26016E)

This automotive circuit was found in the June 1997 issue of Electronis now magazine. The circuit uses a common operational amplifier powered by 12 V.

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General Purpose Meter (CB23574E)
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The LM143 integrated circuit is a high voltage operational amplifier from National Semiconductor that is...
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We found this circuit in the November 1985 issue of Radio Electronics magazine. It uses TTL...