Transformerless Wideband Switch (CB6457E)

We found this chopper circuit in a 1967 publication. The transistors are of the time, and current equivalents can be used.

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Telephone line monitor (CB10149E)
We found this circuit in a 1980s publication on telephony. The circuit uses an integrated...
OPAx196 Texas Instruments Power Operational Amplifiers
Texas Instruments' low power operational amplifiers OPAx196 can be found on Mouser Electronics....
Positive to negative CMOS converter (CB8854E)
This circuit converts a positive CMOS supply voltage to a negative one. We found it in a 90s...