Appendix G: Subsystem Hardware Specifications

• Grayhill 20-key Keypad
• MM74C923N Keypad Encoder
• Burr-Brown INA117 High Voltage CMRR Op-Amp
• National ADC4162
• National LM337 Negative Regulator
• National LM338 Positive Regulators
• Quality Tech. Optical Isolator 4N25