The 4072 is a member of the 4000 Series CMOS range, and contains two independent OR gates, each with four inputs.

This is a monostable multivibrator or pulse generator.

74HC540 is a 20 Pin Octal 3-state Inverting Buffer IC having 2V to 6V Operating Voltage range with 6mA output current. The 3-STATE buffers utilize advanced silicon-gate CMOS technology. They possess high drive current outputs which enable high speed operation even when driving large bus capacitances.

The 74LS373 consists of eight latches with 3-state outputs for bus organized system applications. The flip-flops appear transparent to the data.

Texas Instruments SN7414 Series Inverters are available at ElectroNation.

The 74LS139 is a high speed Dual 1-of-4 Decoder/De-multiplexer. The device has two independent decoders, each accepting two inputs and providing four mutually exclusive active LOW Outputs. Each decoder has an active LOW Enable input which can be used as a data input for a 4-output demultiplexer. Each half of the LS139 can be used as a function generator providing all four minterms of two variables. The LS139 is fabricated with the Schottky barrier diode process for high speed and is completely compatible with all Motorola TTL families.

8051 is an 8-bit family of microcontrollers developed by Intel. This microcontroller was also referred as a system on a chip because it has 128 bytes of RAM, 4K bytes of ROM, 2 Timers, 1 Serial port, and four ports on a single chip. The CPU can work for only 8 bits of data at a time because 8051 is an 8-bit processor. In case the data is larger than 8 bits then it has to be broken into parts so that the CPU can process conveniently.

The 4N25 is an optocoupler for general purpose applications. It contains a light emitting diode optically coupled to a photo-transistor.

TC 4427 is a dual high speed power mosfet driver. ThIS device IS highly latch-up resistant under any conditions within their power and voltage ratings. All terminals are fully protected against Electrostatic Discharge (ESD).