TTL output with 7447, 7490 and 7400 IC.

Reliable TTL (Transistor-Transistor Logic) technology, proven by more than 10 years of work, 20 years or 30 years. Description and diagram is like building attached. A little 'discipline and welding is necessary, but as long as they followed the final result is great. The clock may be your idea on the ads and made the color of the LEDs is required. For an 8-digit clock, the materials are needed: TTL IC 7447 x 8 x 10 7490 7400x 2 7413 x 1 x 8 x 10 7 segment displays BC547 then parts from junk mail box as follows: Resistors, on board 5 volt regulator true tantalum capacitors 7805, many bridges 1N4007 15VA transformer. Enjoy reading the following reference books: TTL Cookbook by Don Lancaster (USA) Digital klokschakelingen van Herbert Bernstein (NL) van flip-flop Klok van Horst Pelka (NL) www.electro digital-tech-online.com