[time-nuts] +12 Volts 1A (plus a bit) supply?

Bob Camp lists at rtty.us
Fri Jun 28 09:13:02 EDT 2013


Hi

If you are running a cheap switcher, you can have a *lot* of crud. 78L08's aren't very good at rejecting high frequency "stuff".

Bob

On Jun 27, 2013, at 11:27 PM, Arthur Dent <golgarfrincham at yahoo.com> wrote:

>> The OCXO in the TBolt has a linear controller. It drops back to about 
>> 150 to 250 ma on the +12 line after warmup. It's been at least 40 
>> years since I saw an on/off oven control in production ….
>> 
>> Remember that the +12 feeds the oscillator circuit. The more crud on 
>> the 12 volts, the worse the phase noise of the output. A linear 
>> regulator is a good idea.
> 
> Note that the +12 for the oscillator goes through a 1 ohm resistor 
> to a linear SO-8 8L08A regulator to supply +8 to the oscillator 
> inside the OXCO case. There is also some bypassing. I had posted 
> some photos of the innards some time ago.
> 
> -Arthur
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