Automotive tachometer (CB7107E)

We found this circuit in an American documentation from the 90s. The circuit applies to vehicles with contact breaker.

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Experimental Solar Radio (CB16363E)
Among the alternative energy sources, one of the most promising is that represented by Astro-Rei....
Neon Lamp Drive with Silicon Switch (CB14706E)
This circuit is from the 1977 GE semiconductor manual. The components used are uncommon today....
Photoelectric aperture control (CB8349E)
Found in an Electronics World of 1968, this circuit is indicated for applications in photography...