The input impedance of a.c.-coupled op amp circuits depends almost entirely on the resistance that sets the d.c. operating point. If CMOS op amps are used, the input is high, in current op amps up to ...
Behold the Vodafone Booster Brolly a clever piece of kit that should solve our three festival grievances: poor mobile signal, running out of battery and the weather. Fitted with a high-gain antenna ...
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