The operational amplifier used in this application is uncommon today. This Raytheon circuit can be designed with equivalent operational and the power supply must be symmetrical.
This circuit was found in February 1976, Radio Electronics magazine. The circuit is powered by 12 V...
This circuit was obtained in a 1973 publication, being implemented with TTL technology. The...
Found in a 1969 documentation on neon lamps, it actually takes advantage of the durability of the neon...