Thank you very much for your reply. I am not an electrical
or electronic engineer,and unfortunately my electronic
knowledge is very limited.
I need a circuit capable of producing square wave signals
(0 to +5V pulses) with some fixed frequencies like 30,20,15,10,5,1 MHZ
(the exact value of them is not so important, for example 9 ~ 11 MHZ
is acceptable for 10MHZ ).
I found the attached schematic on the web.the circuit
produces square wave pulses by means of a 1MHZ crystal oscillator
based on 4584(IC1), and then successively divides the frequency by
10 by means of 4017(IC2~8), and obtains 100k,10k,1k,100,10,1Hz square pulses.
I had tried to use this circuit for my purpose, but the problem was
that the maximum input frequency for 4584 is about 2 MHZ.
because 74HC4017 supports high frequencies( >50MHZ ),can I replace
4584 based crystal oscillator with a single 33MHZ oscillator and
then feed the oscillator signal to 4017 to obtain square wave
pulses whith frequcies like 33/2, 33/3,...33/10 MHZ ?
Why you said me that 74Hc4017 is not suitable for this purpose?
I dont need hex or binary outputs,I want to obtain analog
outputs from 4017 (I think decoded means analog in this situation,
is it correct or not).
I will be very very pleased if you can help me in this way.