# Electronic Circuits and Projects Forum

1. ## what frequency offset?

Hi

It is the difference between the source freq. and the reference freq.
What does this mean and why? is it good or bad?

Many thx

2. Your question has no meaning unless you post a schematic with it.

3. I am going to guess: that you are talking about a radio mixer or a PLL

In a mixer two frequencies are input (INA and INB). The output has both INA and INB and (INA-INB) and (INA+INB)

4. I am just trying to get my head around CD4046 and googled for what it does and why. My objective is to learn as I am building my Arbitrary Function Generator using this http://www.sm0vpo.com:800/eprom/epromosc.htm

5. Thanks for the information.
In this case the CD4046 is a oscillator. The "freg" pot set the voltage on pin9. This in turn set the frequency.

6. Thank you.
Can you give an example with schematic that would illustrate my original question?

On another note, I purchased a 4046 and have been reading the data sheet
http://www.farnell.com/datasheets/7557.pdf

and since I am going to use 12V battery as Vdd I am looking at Fig 16 in the last page "VCO frequency as a function of R1". What does the vertical axis represent? and is the frequency vs. Voltage at pin 9 linear? i.e.
as I increase Pin 9 from zero to 12v, VCO out pin #4 frequency increases linearly?

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