Screech
New Member
I will be designing an elapsed signal pulse timer.
it will count from 0.00000 to 9.99999 seconds.
so, I will nead a 100,000 hz generator.
The idea is to use a 6.4 meg Hz crystal and cmos 4060 to divide by Q6(64) to give me the 100,000 Hz.
then counting with 6 4026 seven segment counter/led driver ic's.
I bought a 6.4000 Meg Hz. Crystal.
Connected it to a cmos 4060 chip, and It seems to be working fine.
Instead of the 10pF and the 39pF Trimer cap, I use two 22pF caps as thats what I had handy.
It seemed to run fine.
the out put of the chip was devided by Q(cant remember) to give an audio frequency that mached the tone from a downloaded pc tone generator.
Test cunducted by ear.
I also noticed that if I removed the caps, the crystal still seemed to function the same.
Is it better to not use the caps?
Question:
is the 39pF trimmer cap used to increase the /decreace the frequency?
I don't want to increase/decrease the frequency.
I want it to run at exactly 6.4MHz.
How do I know that the frequency is exactly 6.4MhZ and not 6.4035Mhz?
I don't have a mutimeter with Frequency function, and I think all multimeters have an error percentage anyway.
I know nothing about this field.
But do you think the crystal is outputing the exact 6.4000 MHz?
I guess it should , since it has 6.4000 printed on the crystal.
thanks
Here's a part print screen of a 4060 data sheet
it will count from 0.00000 to 9.99999 seconds.
so, I will nead a 100,000 hz generator.
The idea is to use a 6.4 meg Hz crystal and cmos 4060 to divide by Q6(64) to give me the 100,000 Hz.
then counting with 6 4026 seven segment counter/led driver ic's.
I bought a 6.4000 Meg Hz. Crystal.
Connected it to a cmos 4060 chip, and It seems to be working fine.
Instead of the 10pF and the 39pF Trimer cap, I use two 22pF caps as thats what I had handy.
It seemed to run fine.
the out put of the chip was devided by Q(cant remember) to give an audio frequency that mached the tone from a downloaded pc tone generator.
Test cunducted by ear.
I also noticed that if I removed the caps, the crystal still seemed to function the same.
Is it better to not use the caps?
Question:
is the 39pF trimmer cap used to increase the /decreace the frequency?
I don't want to increase/decrease the frequency.
I want it to run at exactly 6.4MHz.
How do I know that the frequency is exactly 6.4MhZ and not 6.4035Mhz?
I don't have a mutimeter with Frequency function, and I think all multimeters have an error percentage anyway.
I know nothing about this field.
But do you think the crystal is outputing the exact 6.4000 MHz?
I guess it should , since it has 6.4000 printed on the crystal.
thanks
Here's a part print screen of a 4060 data sheet