PCB art is included in this instructable so you can easily make it!

A 24 hour based clock based on dual decade counters, AND gates, OR gates, BCD to Decimal Converters, and a crystal oscillator. No micro controllers here. This instructable contains PCB art so you can easily make your own.

Quantity is in parentheses. Item number at Digikey.com is in brackets.

(6) 74HC390 Dual Decade Counters [568-1442-5-ND]

(6) 4543 BCD to Decimal Converters [568-3138-5-ND]

(2) 4020 Divide by 16384 Counter [296-2039-5-ND]

(1) 74HC32 Quad OR Gate [568-1434-5-ND]

(1) 74HC08 Quad AND Gate [TC74HC08APF-ND]

(39) 500Ω or 1000Ω drop down resistors for 7 segment displays

(3) 10kΩ Resistors

(6) Common Anode 7-Segment Displays [160-1575-5-ND]

(4) 3 mm Green LEDs

(1) 100 uF Capacitor

(1) 0.1 uF Capacitor across Crystal Oscillator

(1) CMOS 32.768 KHz Crystal Oscillator [SER3618CT-ND]

(3) Momentary Switches [P8071SCT-ND]

(4) 3 mm Green LEDs

(1) Power Plug [CP-102A-ND]

(1) 5V Power Supply