The low-noise amplifier shown uses a rare Raytheon operational amplifier today. The circuit can be implemented with more modern operators and the power source must be symmetrical.
We found this circuit in an old Mullard (Philips) documentation on the 555 and 556 integrated circuit...
This system makes use of incandescent lamps only and uses a SCR with a full wave bridge for powers...
This two-output circuit was found in General Electric documentation from the 1990s. The circuit uses...