This is circuit of  DTL-TTL controlled buffered analog Switch. Due to its low lowleakage and 25ohm rOn, this circuit uses 2N4860 JFET. As a voltage buffer, this circuit uses LM 102. Here is the circuit :

A dual trace oscilloscope chopper can adapt this circuit. Adequate  switch drive controlled DTL-TTL logic levels are generated by the DM7800 monolithic I.C. [Source: National Semiconductor Application Note]

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