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Digital Electronics



This course is designed to give a practical knowledge of the type of electronic circuitry which is used in a Computer System or in any type of Computer Controlled equipment such as Photocopiers, Cash Registers, etc. Digital Electronics involves the use of Silicon chips (Integrated Circuits). The internal structure of a computer is to a large extent comprised of Digital Electronic Circuits.


To enable participants to build, test, and fault-find common Digital Electronic circuits used in computers and computer controlled equipment.

Qualifications:city guilds

  1. City & Guilds of London Institute Digital Electronics 2 (Examination No. 7267-425). This examination consists of 1 written paper and 4 practical assignments. The qualification can be used as part of the requirement for City & Guilds Diploma in IT Systems Support (7267-24).
  2. On completion of the Course, having been successful in an examination, the participant will receive a Hi-Tech Training Certificate.


45 hours (15 x 3 hour training sessions). Classes will be held in comfortable surroundings. Additional time may be allocated if necessary.

Learning Objectives:

  1. Study and use of popular Digital Electronic gates and more advanced circuits.
  2. Building and fault-finding a range of Digital Electronic circuits.
  3. Use test equipment including Multimeters, Oscilloscopes, logic probes and pulsers to implement systematic fault-finding techniques.

Course Content:

  1. Health & Safety, Care of Tools and instruments for assembly and repair
  2. Introduction to Electronics: - Electric Current, OHMS Law, Insulation, Conduction and related Formulae. Resistor colour codes.
  3. Numbering systems, TTL and CMOS technologies
  4. Practical study of Digital I.C.'s including AND, NAND, OR, NOR, X-OR, Inverter, Buffer, SR Latches and D-Latches.
  5. Oscillators, Multivibrators and 555 Timers. Switches and Switch De-bounce circuits and their applications.
  6. Counters, Counter Decoding Circuitry, Shift Registers
  7. A-D and D-A converters
  8. Digital Displays: - LED and LCD, numeric and alphanumeric, operating currents, voltages and power requirements. Display decoders and drivers.
  9. Test Equipment: - Practical use of Analogue and Digital Multimeters, Oscilloscopes, Logic probes, Logic Pulsers, etc.
  10. Fault-finding techniques: - Diagnosing and rectifying faults on circuits built during course.

Practical “Hands-On” experience: - 50% approx.

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