Key Function Block of EPAL-27:

Power Supply section
      »    Power Jack , Fuses, Variable Power Supply
Generator Section
      »    Function Generator, FM, AM and PFI sections, Amplifier, Clock output
Switches and Jacks
      »   Scope with Banana Jack, Slide Switches with LED's
      »   Switching Mode to 3.3 V, 9 number push button Matrix Key Pad
      »   LED Array, Probs, Buzzer
      »   Slide State Relay, Operation and Control
Audio / Display Section
      »   Microphone Input, Speaker Output, Audio Amplifier
      »   Dual Seven Segment Display, Operation and Control
Thermal& Sensor Section
      »   LDR with sensitivity Control, Input and Output Functionality
      »    Heater / Thermistor with sensitivity control, Input and Output Functionality