Starguide - A Practical Guide to Astro-Photography

Analog Digital Converter, or Analog to Digital Unit (ADU): in bits

Electrical Symbol:

References: 

[1]: https://en.wikipedia.org/wiki/Analog-to-digital_converter

[2]: https://physics.stackexchange.com/questions/149516/what-are-adu-analog-to-digital-units

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