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I found a NE555 circuit for this. Nice design as the duty cycle could be controlled. But this only worked at set frequency +- a few Hz.
I need to pursue the 4069 circuit at the top of this post.
So I have dived into LTSPICE.
Unfortunately I cannot find a 4069 model for LTSpice so I cant test...
I never new the calculator existed
I guessed something like it may exist after you informed me of x1000 rule....... so I googled "frequency + capacitance x 1000"
Forgive my ignorance, but the the resistor control the rate of charge of the capacitor????? So there must be an ideal value for the...
"The lower limit is set by the minimal pulse width accepted by the driven circuit, did you check in the meantime?"
This I understand but at this point it time do not know the answer. It is a major task the get this info.
I know the minimum frequency accepted by the driven circuit but not the...
Thanks.
There are a few circuits around but most are set up for MHz and GHz.
Getting the components changed to make the circuit operate at 20-200Hz has been a failure due to my skill set and or lack of.
This one has appeal as it is described as capable of operating over a broad input frequency...
I need to increase the frequency of a square wave signal by a factor of 2.
The source signal is in the range 20 to 200 Hz so the output will be 40-400Hz.
The source signal duty is less than 50%.
The available supply voltage is 14VDC
At this point in time I am unsure what the minimum acceptable...
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