Sample and Hold A404

Summary: This document is a technical schematic for a "Sample and Hold" circuit (model A404) designed by Digital Equipment Corporation. The diagram illustrates the complex configuration of transistors, resistors, diodes, and capacitors required to sample an analog input signal and hold its value.

Key features include:

• Inputs: Analog input, Track Control (positive and negative), and Digital Ground.
• Outputs: Analog output and Analog Ground.
• Power Requirements: The circuit utilizes +15V, -15V, and a -7V filtered supply.
• Components: The circuit utilizes a large array of specific electronic components (listed in the table on the right), including various transistors (such as the 5DA-5, 2N5163, and DEC3009B) and precision resistors and capacitors to maintain signal integrity during the sampling and holding process.