[time-nuts] Got 60HZ?

[Neville Michie]

My general solution to generating clock frequencies of any frequency  
is to
take a middle frequency from the divider chain (say 10kHz) and feed  
it into a PLL
chip with a divider (say 3 or 6 using a Johnson counter which resets)  
in the feedback loop.
This multiplies the VCO output by 3 (30kHz or 60kHz) which will then  
divide down to 60Hz
with very little phase noise. The only difficulty is the need for a  
reset that is synchronised
with the PPS signal. (use a D latch or two)

cheers, Neville Michie



>>
>>> Recently I bought a Efratom Ru frequency standard from eBay and a  
>>> frequency
>>> divider chip that makes 1MHZ,100KHZ,25KHZ,10KHZ,100HZ and a 1HZ  
>>> output.
>>> Today I thought of a way to make a nice 60HZ so you can use a  
>>> mains-powered
>>> clock for the display (using amplifier and transformer wired  
>>> "backwards").
>>>
>>
>>
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