[time-nuts] Re: Low 1/f transistors for oscillator

[glen english LIST]

Thanks Bob and Rick for the time taken to write up the info.

  also, undersampling the output  to an audio amplifier, I can HEAR this 
noise, a bit bursty. When I undersample a harmonic of the HP oscillators 
I have - I do not hear said noise (Â  my 10811, or my E1948.) . ....I've 
never really paid much attention this close in (1 Hz <= 10 Hz)Â  but I am 
building a much better high performance ADC clock reference than I 
currently have.

I have some newer crystals arriving this week from a company in .CZ , 
and I will try a few different transistors and measure also at 100Hz.  
Oh ESR as far as I can measure is about 120 ohms they are cheap and seem 
to have a bit of non-monotonicity when bending them..  New crystals 
coming are 3rdOTÂ  and spec at 40 ohms.

I will report back.

-glen

On 17/01/2023 12:12 pm, Richard Karlquist wrote:
>
> Generally speaking, the 1/f noise at, say 10 Hz, for a crystal 
> oscillator is determined
>
> entirely by the intrinsic noise of the crys
>