[ARC5] BC453 on 24V - screen voltage

[Kenneth G. Gordon]

On 10 Dec 2019 at 9:51, Dennis Monticelli wrote:

> 
> Actually, floating the ground lug leaves the screens hard connected to B+ via the top resistor in 
> the divider.  That's OK.

Ah. Yes. I had not thought of that. You are correct, of course.
 
> As for the minimum practical B+ voltage, I have found that the first circuit to collapse is the LO.  
> Sometimes running down to 28V kills that oscillator, sometimes it doesn't. 

The reason for that is that with 250 VDC as the B+ the HFO is operating at 30 VDC. I've 
measured it. Therefore, since that voltage is approximately 10% of the B+, all things being 
equal (which they seldom are), that means that at 24 VDC B+ the HFO is operating on 2.4 
VDC.

Which is amazing, when you think about it...

Ken W7EKB