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The newer, open sorce edition up to 250MHz now available here:
http://www.rhelectronics.net/store/frequency-counter-diy-kit-module.html
DIY Frequency Counter USB Module 1Hz to 50MHz with LCD.
Technical specification:
Auto Range Measure, 1Hz to 50MHz
Measurement cycle 1 second
Accuracy about 1%
Input Sensitivity 100mV to 500mV AC peak
Module Size: 85x40x35 mm
Easy to assemble and solder
Package include:
1x Manufactured high quality PCB 85x40 mm
1x LCD 16x2 HD44780 compatible
1x Trimmer Potentiometer top adjust 5K
2x 5% Carbon Film Resistor 47 Ohm
2x 5% Carbon Film Resistor 10K
1x 5% Carbon Film Resistor 220 Ohm
1x 5% Carbon Film Resistor 300 Ohm
1x Ceramic Disc Capacitor 10pF 50V
4x Ceramic Disc Capacitor 10nF 50V
1x Ceramic Disc Capacitor 100nF 50V
2x Ceramic Disc Capacitor 30pF 50V
2x Electrolytic Capacitor 47uF 16V
1x Electrolytic Capacitor 100uF 10V
1x Electrolytic Capacitor 220uF 10V
1x SS9018 NPN RF Transistor
2x Silicone Diode 1N4148
1x 4.000Mhz Quartz Crystal
1x PIC16F628A Microcontroller flashed with hex
1x 18pin DIP Socket
1x USB type B Female PCB Connector
1x Male Pin Header 2 pins
2x Male Pin Header 21mm 6pins for LCD connection
2x M2.5 x 6 Iron Bolts with Standoff
2x LCD Drawing for easy enclosure panel drill and cut
PDF file with circuit and full assembling instruction will be delivered to your e-mail.