Electronics System 1 – code: 4868.19

Electronics System 1

Code: 4868.19

A comprehensive system introducing the principles of electronics

The Electronics System 1 is designed to be rugged and easy to use.

Electronics System 1 has modular design: each block contains a fully functional electronic component, from a potentiometer to a photo resistor. Using this system, it’s possible to observe and to understand how semi-conductor components work and how they behave in static and dynamic circuits. Electronics System 1 can be mounted on the Altay Magnetic Board (code 4114.30), for class demonstration experiments. The system includes a durable Aluminium carry case with foam inserts.

Size: 50x45x15 cm
Weight: 4.5 kg
Packing: external suitcase in aluminium, internal foam to prevent accidental shock.

Equipment Needed
Electricity System 1 (code 4866.19)
Power supply 1.5 A AC/DC (code 2407.70)

Equipment Suggested
RED Voltage & Current Sensor (code 4840.16)
Tripod Stand (code 4830.46)
Digital Multimeter (code 2275.10)
RED Universal magnet Support (code 4831.06)
Altay Magnetic Board (code 4114.30)


  • Board
  • Si diode
  • Signal transistor PNP
  • Signal transistor NPN
  • Power transistor PNP
  • Power transistor NPN
  • LED Infrared LED diode
  • Unijunction transistor UJT
  • Silicon controlled rectifier SCR
  • Triac
  • Phototransistor
  • Photoresistance v
  • Zener diode 6.2 V
  • PTC resistor
  • NTC resistor
  • Potentiometer


  • Investigating the diode and the PN junction
  • LED diodes
  • Experiments with rectifier diodes
  • Working with Zener diodes
  • Experiments with the PNP transistor
  • Experiments with the NPN transistor
  • Comparison between the signal and power transistor
  • Experiments with the unijunction transistor UJT
  • Experiments with the silicon controlled rectifier SCR
  • Investigating the TRIAC
  • Working with the phototransistor
  • What is photoresistance?
  • Experiments with the PTC (positive temperature coefficient) resistor
  • Experiments with the NTC
    (negative temperature coefficient) resistor
  • Experiments with the astable multivibrator


  • Characteristics of diode
  • Investigating transistors
  • Comparing PNP and NPN transistors
  • Characteristics LED diodes and Infrared LEDs
  • Looking at photoresistors versus phototransistors
  • Experiments on power dissipation
  • Investigating Signal versus Power transistors
  • Transistors in power applications:
    thyristors (SCR, UJT and TRIAC)
  • Theory of rectification in circuits
  • Theory of reflection in circuits
  • Temperature and the use of thermistors in circuits
  • Looking at Zener diodes in circuits
  • The astable multivibrator (or flipflop circuit)
EXAMPLE OF USE: The Astable Multivibrator

Building a flip-flop circuit.

An astable multivibrator is a two-stage switching circuit where the output of the first stage is connected to the input of the second and vice-versa. The outputs of both stages are complementary. This multivibrator generates square waves without any external triggering pulse. The circuit has two stable states and switches back and forth from one state to another, remaining in each state for a period depending upon the discharging of the capacitive circuit. The multivibrator is an example of a relaxation oscillator, whose frequency may be controlled by external synchronizing pulses.

Flip-flop circuit