Bandpass filter with two operational (CB20939E)

This circuit makes use of two transconductance operators. We found it in National Semiconductor documentation from the 1980s.

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Power switch without RFI (CB21543E)
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96 MHz Oscillator (CB9624E)
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Relay control (CB22286E)
This shield from the 60's uses a germanium transistor of the time and a common type of relay of...