Binary Neon (CB6806E)

This flip-flop with neon lamps was found in a 1969 publication that deals precisely with neon lamps. Observe the high supply voltage.

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TTL Optical Interface (CB16022E)
In the figure we have a Texas Instruments circuit for TTL interfacing using discrete transistors. The two...
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This circuit was found in Radio Electronics magazine from June 1963. The range is small and the...
50W 40 Meters RF Amplifier (CB17683E)
The project presented in a 2009 documentation is intended for radio amateurs operating in the...