Project 2 - A Simple Psuedo-Random Number Generator

• The assignment for this project was to produce a psuedo-random number sequence using D-type flipflops.
• A 555 timer chip was used to produce the clock pulse, which was passed through an inverter before being sent to the 74194 D-flipflop, to reduce noise.
  

Details can be found HERE

Project 1 - DTMF Decoder Project

• This project decodes touch-tones and allow you to control external devices.
  
• It will give 20 distinct outputs based on how the touch-tones are received.
• The upper bank of outputs is activated by using the '*' key and the lower bank is activated by using the '#' key.
• The '*' key might be considered as an ON.
• The '#' key might be considered on OFF.
• This would yield 10 pairs of commands or each output could be used independently to yield 20 outputs.
• Use SSI202 decoder chip as the dtmf detector and decoder.
• Use 74175 as latch to hold the selected number.
• Use 7485 as comparator.
• Good project for the learning of decoder concept and principal.

Further information go to the website DTMF Decoder