A NAND Gate-Only Frequency Counter

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In a nutshell:

A six-digit frequency counter with leading-zero suppression implemented entirely in NAND gate logic.

Complete I.C. complement:	249 * 74HC00  quad NAND gate
			  	1   * 74HC132 quad NAND gate with schmitt-trigger inputs 	
				1   * 4011B   quad NAND gate (used in analogue mode as the signal-input pre-amplifier) 			

Measurement range:		1Hz-to-999,999Hz       	
Gate period:			1s
Display update rate:		0.5Hz (2s)

Design files and associated documents for download:

Timebase board schematic in PDF format
Control and signal amplifier board schematic in PDF format
Counter board schematic in PDF format
Display board schematic in PDF format
Wiring and power supply diagram in PDF format

Timebase board Gerber file bottom layer
Timebase board Gerber file top overlay
Timebase board NC drill file

Control and signal amplifier board Gerber file bottom layer
Control and signal amplifier board Gerber file top overlay
Control and signal amplifier board NC drill file

Counter board Gerber file bottom layer
Counter board Gerber file top overlay
Counter board NC drill file

Display board Gerber file bottom layer
Display board Gerber file top layer
Display board Gerber file bottom overlay
Display board Gerber file top overlay
Display board NC drill file