DIY Frequency Counter And Crystal Testing Kit
DIY Frequency Counter And Crystal Testing Kit (1 Hz to 50 Mhz) Last month I had ordered a frequency counter and crystal testing kit from Alixpress for $2.57. In the kit you will get the main pcb, 7 element display, PIC16F628 , 3 transistors , resistors, capacitors ,small trimmer, 20Mhz crystal, a push button switch . It was designed by DL4YHF but now it is sold by chinese sellers on Ebay and Alixpress . Lets Start Soldering It Prepare your soldering station and let the iron properly heated up. First start soldering resistors and other small components. And then solder the big components like 7 segment display and the PIC 16f628 IC etc. After completing the soldering, check for any un-soldered point and clean the flux out of the pcb . Testing Power it via the port or directly by 5v to 9v dc .The regulator 7550 will regulate the voltage and will provide 5v to the whole circuit. When the circuit will get power all the 7 segemen...