[time-nuts] Broken Ovenaire OSC 85-50

[Bruce Griffiths]

WB6BNQ wrote:
> I agree with Warren.  The VCC seems way too low.  Interestingly, noone else seems to think so,
> or did not notice it.
>
> Bill....WB6BNQ
>
>
>   
It was noticed, but it is consistent with the resistor values used in
the circuit.
The crystal current is determined by the dc emitter current of the
oscillator transistor.
Thus one cannot arbitrarily increase Vcc without considering the
consequences for the crystal current etc.

Bruce
> WarrenS wrote:
>
>   
>> Here is my  two cents worth
>> 20 mv output, sure sounds like something is broken.
>> It should be fixed before it is modified.
>> The 2.49 volts on the Red input voltage seem LOW, More Vcc maybe.
>> The "Grn" labeled wire, FreqCtrl  input should be about 1/2 VCC  for testing.
>> If you do 'need' to modify the gain,
>> It would seem better to bypass the 470 ohm resistor with a cap in series with the 47 ohms.
>>
>> ws
>>     
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>