• Digital Clock Circuit using the CMOS 4047 Low-Power Monostable/Astable Multivibrator. Note CMOS runs on 3v-15v, and uses low current as it uses Complementary NPN & PNP transistors, instead of TTL 5v Transistor-Resistor setup. With the resistor burning up current, where as transistors only use current when they change state. Can act as a replacement to the 555 timer. Only requires two R-C external components.

• SPO256-AL2 Speech Synthesiser board with SPO256.pdf Which can be driven from a PC interface. Can say 'I am a computer'. The SPO256 is a 24-pin DIL Chip. Manufactured circa. 1986.

• Logic Probe Projects Includes general description, pictures, component list, and tips on how to prepare the case:
  • CMOS / TTL Logic Probe ; and two CMOS Logic Probe Projects: one with LED's, the other with a 7-segment display from the Electronics - The Maplin Magazine.

• www.eBay.co.uk list a 'Logic Probe' from the UK - by Tenma: TTL, DTL, HTL, CMOS up to 20MHz for £3 (GBP) + £1 (GBP) P&P.

• CMOS 4511 - BCD to 7-segment [LED] display driver.
  
• Wikipedia entry for 7-segment LED displays first patented in 1908.
  
• Wikipedia entry for Nixie tube displays with 10 seperate filaments for the digits 0-9 plus d.p. Invented in 1964 before complex logic IC's were commonly available.
  
• Wikipedia entry for Sixteen-segment LED displays also known as Starburst. Can support every letter of the Alphabet.

• Additional Chip Power Supplies: 5V TTL and 12V CMOS (can be in range 3V-15V).

• Additional From single Transistors to VSLI (> 1,000,000 Transistors on one chip) and beyond ; plus Intel processors.

http://doctronics.co.uk/		CMOS Logic
4000 Dual 3-input NOR gate + inverter.	4001 Quad 2-input NOR gate.	4002 Dual 4-input NOR gate.
4008 4-bit binary full adder.	4011 Quad 2-input NAND gate.	4012 Dual 4-input NAND gate.
4013 Dual D-type flip-flop.	4014 8-stage shift register.	4015 Dual 4-stage shift register.
4016 Quad bilateral switch.	4017 Divide-by-10 counter (5-stage Johnson counter).	4073 Triple 3-input AND gate.
4081 Quad 2-input AND gate.	4082 Dual 4-input AND gate.	4510 BCD up/down counter.
4511 BCD to 7-segment latch/decoder/driver.

4000 series CMOS Logic ICs