P piyush_it1 New Member Apr 6, 2005 #1 I am building a frequency counter using counter IC 7490 my doubt is that how the pin named A & B should be connected to make a divide by 10 counter Also i want to know a circuit configuration to connect my crystal oscillator so as to generate the clock and if possible kindly tell me the crystal oscillator suited for a range of 1MHz.....,..
I am building a frequency counter using counter IC 7490 my doubt is that how the pin named A & B should be connected to make a divide by 10 counter Also i want to know a circuit configuration to connect my crystal oscillator so as to generate the clock and if possible kindly tell me the crystal oscillator suited for a range of 1MHz.....,..
bonxer New Member Apr 6, 2005 #2 With the 7490, you input your clock pulse to CP0. This will be /2 and output to Q0. You wire Q0 to CP1, which is the /5 input. This page has various oscillators you can make, depending on whether you want to use a series or parallel crystal. http://z80.info/uexosc.htm Attachments 7490connections.png 6.4 KB · Views: 250
With the 7490, you input your clock pulse to CP0. This will be /2 and output to Q0. You wire Q0 to CP1, which is the /5 input. This page has various oscillators you can make, depending on whether you want to use a series or parallel crystal. http://z80.info/uexosc.htm