This circuit was found in a 1964 Electronic Design. It generates opposite phase signals from an input signal. Modern equivalent transistors can be used in the same configuration.
This decorative object was found in a Signetics documentation from the 60s. The circuit uses neon...
This circuit of old American documentation (1965) can be applied to any transistor. | Clique na...
The LEDs act as diodes, so if good they will show the same characteristic curve. Arrangment shown...