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  • 2017-07-21 04:26:17

    Frequency measurement: I managed to run it only if the input signal is between 4.7 and 5 volts (not to be exceeded). The signal goes directly to pin 3 of the PIC (5V max). An incoming signal amplification circuit must be provided. Quartz measurements: Very poor circuit. It depends a lot on the supply voltage, the temperature and the quartz frequency. Limited use. Measurement examples: (3,2748 MHz -> 0) (4,9152 MHz -> 4,9166) (16 MHz -> 16,001 16,006) (20 MHz -> 20,007) (22 MHz ->

  • RudyO
    2019-05-19 07:44:02

    High Quality DIY Frequency Counter and Crystal checker. Works perfect !! Testing a 8700.000Hz crystal and a 50Hz input signal. See Pictures. Recommended !!!!

  • RIC
    2018-11-08 21:23:29

    Thank YOU Please I did pay in September the RK560 frequency counter meter . Take pictures Photos the Bill Ticket that It did pay in date September 2018. I will wait the RK560 Frequency Counter Meter . Please read see pictures Photos the Bill Ticket. Thank YOU BANGGOOD very very much BANGGOOD.

  • kepjec
    2016-01-26 16:31:45

    Ještě jsem jej nezkoumal. Tak nevím jak je to se vstupními obvody. Celé je to postaveno na procesoru PIC. Myslel jsem, že tam bude ATMega. Nevadí. Jinak standardní PCB, i ostatní součástky. Doufám tedy že bude sloužit dobře

  • 2016-08-11 14:51:16

    Quick project for the beginning kit builder. I would suggest Chuck Adams (K7QO) website for step by step English build instructions - look for "Kit Exercise #1 Chinese Crystal Checker and Frequency Counter". When built kit is a very useful Crystal tester. I would like to have instructions on some of the other features that are selected by the push button. Also I wondered if in needs calibration since all crystals checked are 0.3-0.5 kHz above the stamped valu

  • 2017-03-02 14:56:32

    Dear Sir, I have receive the meter but when I turn on, one bar led of the display is off. All of the d (led bar) are of . So it is imposible to read any number. Please What I have to do? thank you

    Comments (1)
  • James
    2017-05-14 00:10:27

    Kit was simple as usual to construct. Some Instructions would be nice. Here you see it's working with 16M Crystal for Arduino . Next Counter using M8 Transistor Tester(Ver.12864) 25Khz test signal. I'm Happy. You Happy ?

  • 2018-04-01 18:20:31

    Funziona benissimo e con qualche modifica si può migliorare ancora di più

  • belean
    2017-09-25 12:35:44

    Work very nice .Very good product and delivery service

  • 2017-09-04 02:39:05

    Perfect to read frequency.. For the the price I pay I am very satisfied...


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