This decorative object was found in a Signetics documentation from the 60s. The circuit uses neon lamps and must be powered by a high continuous voltage. The current is extremely low.
This circuit can be enabled and disabled by a TTL signal. The relay is a low current reed type and...
This Wien bridge oscillator was found in an Analog Devices documentation from the 90's. The...
In the figure we have the suggestion of coupling an audio oscillator to monitor the CW...